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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c1f4f81d3a439cd1a8128e4ab11c7caac7cc0ad8">c1f4f81d</a></strong>
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<span>by Tamar Christina</span>
<i>at 2020-07-24T18:13:00-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: change memory allocation strategy and fix double free errors.
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<h4>2 changed files:</h4>
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<a href="#a244a38181401b1a8d77645c71b6e87cf6d2a4ba">
libraries/base/GHC/Event/Windows.hsc
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<a href="#90b209a4e0e40fe3748bc7d31074e8804ee2bbc9">
libraries/base/GHC/Event/Windows/FFI.hsc
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<h4>Changes:</h4>
<li id="a244a38181401b1a8d77645c71b6e87cf6d2a4ba">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c1f4f81d3a439cd1a8128e4ab11c7caac7cc0ad8#a244a38181401b1a8d77645c71b6e87cf6d2a4ba"><strong>libraries/base/GHC/Event/Windows.hsc</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="86" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -86,7 +86,9 @@ import Data.Foldable (mapM_, length, forM_)</td>
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<pre style="margin: 0;"> <span id="LC86" class="line" lang="plaintext">import Data.Maybe (isJust, maybe)</span>
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<td class="diff-line-num old_line" data-linenumber="87" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="plaintext">import GHC.Event.Windows.Clock (Clock, Seconds, getClock, getTime)</span>
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<pre style="margin: 0;">-<span id="LC89" class="line" lang="plaintext">import GHC.Event.Windows.FFI (LPOVERLAPPED, OVERLAPPED_ENTRY(..))</span>
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="plaintext">import GHC.Event.Windows.FFI (LPOVERLAPPED, OVERLAPPED_ENTRY(..),</span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="plaintext"> CompletionData(..), CompletionCallback,</span>
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<td class="diff-line-num new new_line" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="plaintext"> withRequest)</span>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="plaintext">import GHC.Event.Windows.ManagedThreadPool</span>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="plaintext">import GHC.Event.Internal.Types</span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="plaintext">import GHC.Event.Unique</span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -300,43 +302,6 @@ foreign import ccall safe "completeSynchronousRequest"</td>
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<pre style="margin: 0;"> <span id="LC302" class="line" lang="plaintext">------------------------------------------------------------------------</span>
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<pre style="margin: 0;"> <span id="LC303" class="line" lang="plaintext">-- Manager structures</span>
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<pre style="margin: 0;"> <span id="LC304" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC303" class="line" lang="plaintext">-- | Callback type that will be called when an I/O operation completes.</span>
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<pre style="margin: 0;">-<span id="LC304" class="line" lang="plaintext">type IOCallback = CompletionCallback ()</span>
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<pre style="margin: 0;">-<span id="LC305" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC306" class="line" lang="plaintext">-- | Wrap the IOCallback type into a FunPtr.</span>
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<td class="diff-line-num old old_line" data-linenumber="307" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC307" class="line" lang="plaintext">foreign import ccall "wrapper"</span>
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<pre style="margin: 0;">-<span id="LC308" class="line" lang="plaintext"> wrapIOCallback :: IOCallback -> IO (FunPtr IOCallback)</span>
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<td class="diff-line-num old old_line" data-linenumber="309" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC309" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC310" class="line" lang="plaintext">-- | Unwrap a FunPtr IOCallback to a normal Haskell function.</span>
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<pre style="margin: 0;">-<span id="LC311" class="line" lang="plaintext">foreign import ccall "dynamic"</span>
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<pre style="margin: 0;">-<span id="LC312" class="line" lang="plaintext"> mkIOCallback :: FunPtr IOCallback -> IOCallback</span>
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313
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<pre style="margin: 0;">-<span id="LC313" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC314" class="line" lang="plaintext">-- | Structure that the I/O manager uses to associate callbacks with</span>
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315
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<pre style="margin: 0;">-<span id="LC315" class="line" lang="plaintext">-- additional payload such as their OVERLAPPED structure and Win32 handle</span>
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316
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<pre style="margin: 0;">-<span id="LC316" class="line" lang="plaintext">-- etc. *Must* be kept in sync with that in `winio_structs.h` or horrible things</span>
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317
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<pre style="margin: 0;">-<span id="LC317" class="line" lang="plaintext">-- happen.</span>
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318
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<pre style="margin: 0;">-<span id="LC318" class="line" lang="plaintext">--</span>
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319
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<pre style="margin: 0;">-<span id="LC319" class="line" lang="plaintext">-- We keep the handle around for the benefit of ghc-external libraries making</span>
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320
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<pre style="margin: 0;">-<span id="LC320" class="line" lang="plaintext">-- use of the manager.</span>
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<pre style="margin: 0;">-<span id="LC321" class="line" lang="plaintext">data CompletionData = CompletionData { cdHandle :: !HANDLE</span>
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<pre style="margin: 0;">-<span id="LC322" class="line" lang="plaintext"> , cdCallback :: !IOCallback</span>
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<pre style="margin: 0;">-<span id="LC323" class="line" lang="plaintext"> }</span>
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<pre style="margin: 0;">-<span id="LC324" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC325" class="line" lang="plaintext">instance Storable CompletionData where</span>
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<pre style="margin: 0;">-<span id="LC326" class="line" lang="plaintext"> sizeOf _ = #{size CompletionData}</span>
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<pre style="margin: 0;">-<span id="LC327" class="line" lang="plaintext"> alignment _ = #{alignment CompletionData}</span>
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<pre style="margin: 0;">-<span id="LC328" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC329" class="line" lang="plaintext"> peek ptr = do</span>
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<pre style="margin: 0;">-<span id="LC330" class="line" lang="plaintext"> cdCallback <- mkIOCallback `fmap` #{peek CompletionData, cdCallback} ptr</span>
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<pre style="margin: 0;">-<span id="LC331" class="line" lang="plaintext"> cdHandle <- #{peek CompletionData, cdHandle} ptr</span>
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<pre style="margin: 0;">-<span id="LC332" class="line" lang="plaintext"> let !cd = CompletionData{..}</span>
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<pre style="margin: 0;">-<span id="LC333" class="line" lang="plaintext"> return cd</span>
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<pre style="margin: 0;">-<span id="LC334" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC335" class="line" lang="plaintext"> poke ptr CompletionData{..} = do</span>
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<pre style="margin: 0;">-<span id="LC336" class="line" lang="plaintext"> cb <- wrapIOCallback cdCallback</span>
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<pre style="margin: 0;">-<span id="LC337" class="line" lang="plaintext"> #{poke CompletionData, cdCallback} ptr cb</span>
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<pre style="margin: 0;">-<span id="LC338" class="line" lang="plaintext"> #{poke CompletionData, cdHandle} ptr cdHandle</span>
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339
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<pre style="margin: 0;">-<span id="LC339" class="line" lang="plaintext"></span>
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340
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<pre style="margin: 0;"> <span id="LC305" class="line" lang="plaintext">-- | Pointer offset in bytes to the location of hoData in HASKELL_OVERLAPPPED</span>
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341
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306
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<pre style="margin: 0;"> <span id="LC306" class="line" lang="plaintext">cdOffset :: Int</span>
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342
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307
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<pre style="margin: 0;"> <span id="LC307" class="line" lang="plaintext">cdOffset = #{const __builtin_offsetof (HASKELL_OVERLAPPED, hoData)}</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -507,11 +472,6 @@ data CbResult a</td>
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472
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<pre style="margin: 0;"> <span id="LC472" class="line" lang="plaintext"> -- manager will perform additional checks.</span>
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508
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473
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<pre style="margin: 0;"> <span id="LC473" class="line" lang="plaintext"> deriving Show</span>
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509
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474
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<pre style="margin: 0;"> <span id="LC474" class="line" lang="plaintext"></span>
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510
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<pre style="margin: 0;">-<span id="LC510" class="line" lang="plaintext">-- | Called when the completion is delivered.</span>
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<pre style="margin: 0;">-<span id="LC511" class="line" lang="plaintext">type CompletionCallback a = ErrCode -- ^ 0 indicates success</span>
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512
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<pre style="margin: 0;">-<span id="LC512" class="line" lang="plaintext"> -> DWORD -- ^ Number of bytes transferred</span>
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<pre style="margin: 0;">-<span id="LC513" class="line" lang="plaintext"> -> IO a</span>
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<pre style="margin: 0;">-<span id="LC514" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC475" class="line" lang="plaintext">-- | Associate a 'HANDLE' with the current I/O manager's completion port.</span>
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<pre style="margin: 0;"> <span id="LC476" class="line" lang="plaintext">-- This must be done before using the handle with 'withOverlapped'.</span>
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517
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477
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<pre style="margin: 0;"> <span id="LC477" class="line" lang="plaintext">associateHandle' :: HANDLE -> IO ()</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -581,23 +541,18 @@ withOverlappedEx mgr fname h offset startCB completionCB = do</td>
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581
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<pre style="margin: 0;"> <span id="LC541" class="line" lang="plaintext"> signalThrow ex = failIfFalse_ (dbgMsg "signalThrow") $</span>
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582
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542
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<pre style="margin: 0;"> <span id="LC542" class="line" lang="plaintext"> writeIOPort signal (IOFailed ex)</span>
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583
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543
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<pre style="margin: 0;"> <span id="LC543" class="line" lang="plaintext"> mask_ $ do</span>
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584
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<pre style="margin: 0;">-<span id="LC584" class="line" lang="plaintext"> let completionCB' e b = completionCB e b >>= \result -></span>
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585
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<pre style="margin: 0;">-<span id="LC585" class="line" lang="plaintext"> case result of</span>
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586
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<pre style="margin: 0;">-<span id="LC586" class="line" lang="plaintext"> IOSuccess val -> signalReturn val</span>
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587
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<pre style="margin: 0;">-<span id="LC587" class="line" lang="plaintext"> IOFailed err -> signalThrow err</span>
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588
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<pre style="margin: 0;">-<span id="LC588" class="line" lang="plaintext"> hs_lpol <- FFI.allocOverlapped offset</span>
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<pre style="margin: 0;">-<span id="LC589" class="line" lang="plaintext"> -- Create the completion record and store it.</span>
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<pre style="margin: 0;">-<span id="LC590" class="line" lang="plaintext"> -- We only need the record when we enqueue a request, however if we</span>
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591
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<pre style="margin: 0;">-<span id="LC591" class="line" lang="plaintext"> -- delay creating it then we will run into a race condition where the</span>
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592
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<pre style="margin: 0;">-<span id="LC592" class="line" lang="plaintext"> -- driver may have finished servicing the request before we were ready</span>
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593
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<pre style="margin: 0;">-<span id="LC593" class="line" lang="plaintext"> -- and so the request won't have the book keeping information to know</span>
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594
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<pre style="margin: 0;">-<span id="LC594" class="line" lang="plaintext"> -- what to do. So because of that we always create the payload, If we</span>
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595
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<pre style="margin: 0;">-<span id="LC595" class="line" lang="plaintext"> -- need it ok, if we don't that's no problem. This approach prevents</span>
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596
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<pre style="margin: 0;">-<span id="LC596" class="line" lang="plaintext"> -- expensive lookups in hash-tables.</span>
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597
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<pre style="margin: 0;">-<span id="LC597" class="line" lang="plaintext"> --</span>
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598
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<pre style="margin: 0;">-<span id="LC598" class="line" lang="plaintext"> -- Todo: Use a memory pool for this so we don't have to hit malloc every</span>
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599
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<pre style="margin: 0;">-<span id="LC599" class="line" lang="plaintext"> -- time. This would allow us to scale better.</span>
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<pre style="margin: 0;">-<span id="LC600" class="line" lang="plaintext"> cdData <- new (CompletionData h completionCB') :: IO (Ptr CompletionData)</span>
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<pre style="margin: 0;">+<span id="LC544" class="line" lang="plaintext"> let completionCB' e b = completionCB e b >>= \result -></span>
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<pre style="margin: 0;">+<span id="LC545" class="line" lang="plaintext"> case result of</span>
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<pre style="margin: 0;">+<span id="LC546" class="line" lang="plaintext"> IOSuccess val -> signalReturn val</span>
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<pre style="margin: 0;">+<span id="LC547" class="line" lang="plaintext"> IOFailed err -> signalThrow err</span>
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<pre style="margin: 0;">+<span id="LC548" class="line" lang="plaintext"> let callbackData = CompletionData h completionCB'</span>
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<pre style="margin: 0;">+<span id="LC549" class="line" lang="plaintext"> -- Note [Memory Management]</span>
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<pre style="margin: 0;">+<span id="LC550" class="line" lang="plaintext"> -- These callback data and especially the overlapped structs have to keep</span>
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<pre style="margin: 0;">+<span id="LC551" class="line" lang="plaintext"> -- alive throughout the entire lifetime of the requests. Since this</span>
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<pre style="margin: 0;">+<span id="LC552" class="line" lang="plaintext"> -- function will block until done so it can call completionCB at the end</span>
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553
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<pre style="margin: 0;">+<span id="LC553" class="line" lang="plaintext"> -- we can safely use dynamic memory management here and so reduce the</span>
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<pre style="margin: 0;">+<span id="LC554" class="line" lang="plaintext"> -- possibility of memory errors.</span>
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<pre style="margin: 0;">+<span id="LC555" class="line" lang="plaintext"> withRequest offset callbackData $ \hs_lpol cdData -> do</span>
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556
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<pre style="margin: 0;"> <span id="LC556" class="line" lang="plaintext"> let ptr_lpol = hs_lpol `plusPtr` cdOffset</span>
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602
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557
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<pre style="margin: 0;"> <span id="LC557" class="line" lang="plaintext"> let lpol = castPtr hs_lpol</span>
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603
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558
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<pre style="margin: 0;"> <span id="LC558" class="line" lang="plaintext"> debugIO $ "hs_lpol:" ++ show hs_lpol</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -713,11 +668,8 @@ withOverlappedEx mgr fname h offset startCB completionCB = do</td>
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<pre style="margin: 0;"> <span id="LC668" class="line" lang="plaintext"> debugIO $ "## Waiting for cancellation record... "</span>
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669
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<pre style="margin: 0;"> <span id="LC669" class="line" lang="plaintext"> _ <- FFI.getOverlappedResult h lpol True</span>
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<pre style="margin: 0;"> <span id="LC670" class="line" lang="plaintext"> oldDataPtr <- exchangePtr ptr_lpol nullReq</span>
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716
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<pre style="margin: 0;">-<span id="LC716" class="line" lang="plaintext"> -- Check if we have to free and cleanup pointer</span>
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717
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671
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<pre style="margin: 0;"> <span id="LC671" class="line" lang="plaintext"> when (oldDataPtr == cdData) $</span>
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718
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<pre style="margin: 0;">-<span id="LC718" class="line" lang="plaintext"> do free oldDataPtr</span>
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719
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<pre style="margin: 0;">-<span id="LC719" class="line" lang="plaintext"> free hs_lpol</span>
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720
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<pre style="margin: 0;">-<span id="LC720" class="line" lang="plaintext"> reqs <- removeRequest</span>
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<pre style="margin: 0;">+<span id="LC672" class="line" lang="plaintext"> do reqs <- removeRequest</span>
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<pre style="margin: 0;"> <span id="LC673" class="line" lang="plaintext"> debugIO $ "-1.. " ++ show reqs ++ " requests queued after error."</span>
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<pre style="margin: 0;"> <span id="LC674" class="line" lang="plaintext"> status <- fmap fromIntegral getLastError</span>
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723
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675
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<pre style="margin: 0;"> <span id="LC675" class="line" lang="plaintext"> completionCB' status 0</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -741,7 +693,6 @@ withOverlappedEx mgr fname h offset startCB completionCB = do</td>
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693
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<pre style="margin: 0;"> <span id="LC693" class="line" lang="plaintext"> case startCBResult of</span>
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694
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="plaintext"> CbPending -> runner</span>
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743
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695
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<pre style="margin: 0;"> <span id="LC695" class="line" lang="plaintext"> CbDone rdata -> do</span>
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744
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<pre style="margin: 0;">-<span id="LC744" class="line" lang="plaintext"> free cdData</span>
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696
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<pre style="margin: 0;"> <span id="LC696" class="line" lang="plaintext"> debugIO $ dbgMsg $ ":: done " ++ show lpol ++ " - " ++ show rdata</span>
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746
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697
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<pre style="margin: 0;"> <span id="LC697" class="line" lang="plaintext"> bytes <- if isJust rdata</span>
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747
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698
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<pre style="margin: 0;"> <span id="LC698" class="line" lang="plaintext"> then return rdata</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -749,23 +700,18 @@ withOverlappedEx mgr fname h offset startCB completionCB = do</td>
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749
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700
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="plaintext"> else FFI.getOverlappedResult h lpol False</span>
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750
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701
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<pre style="margin: 0;"> <span id="LC701" class="line" lang="plaintext"> debugIO $ dbgMsg $ ":: done bytes: " ++ show bytes</span>
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751
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702
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<pre style="margin: 0;"> <span id="LC702" class="line" lang="plaintext"> case bytes of</span>
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752
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<pre style="margin: 0;">-<span id="LC752" class="line" lang="plaintext"> Just res -> <span class="idiff left right">free hs_lpol >> </span>completionCB 0 res</span>
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703
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<pre style="margin: 0;">+<span id="LC703" class="line" lang="plaintext"> Just res -> completionCB 0 res</span>
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753
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704
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<pre style="margin: 0;"> <span id="LC704" class="line" lang="plaintext"> Nothing -> do err <- FFI.overlappedIOStatus lpol</span>
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754
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705
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="plaintext"> numBytes <- FFI.overlappedIONumBytes lpol</span>
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755
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706
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="plaintext"> -- TODO: Remap between STATUS_ and ERROR_ instead</span>
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756
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707
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<pre style="margin: 0;"> <span id="LC707" class="line" lang="plaintext"> -- of re-interpret here. But for now, don't care.</span>
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757
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708
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<pre style="margin: 0;"> <span id="LC708" class="line" lang="plaintext"> let err' = fromIntegral err</span>
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758
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<pre style="margin: 0;">-<span id="LC758" class="line" lang="plaintext"> free hs_lpol</span>
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759
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709
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<pre style="margin: 0;"> <span id="LC709" class="line" lang="plaintext"> debugIO $ dbgMsg $ ":: done callback: " ++ show err' ++ " - " ++ show numBytes</span>
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760
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710
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<pre style="margin: 0;"> <span id="LC710" class="line" lang="plaintext"> completionCB err' (fromIntegral numBytes)</span>
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761
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711
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<pre style="margin: 0;"> <span id="LC711" class="line" lang="plaintext"> CbError err -> do</span>
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762
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<pre style="margin: 0;">-<span id="LC762" class="line" lang="plaintext"> free cdData</span>
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763
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<pre style="margin: 0;">-<span id="LC763" class="line" lang="plaintext"> free hs_lpol</span>
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764
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712
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<pre style="margin: 0;"> <span id="LC712" class="line" lang="plaintext"> let err' = fromIntegral err</span>
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765
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713
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<pre style="margin: 0;"> <span id="LC713" class="line" lang="plaintext"> completionCB err' 0</span>
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766
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714
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<pre style="margin: 0;"> <span id="LC714" class="line" lang="plaintext"> _ -> do</span>
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767
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<pre style="margin: 0;">-<span id="LC767" class="line" lang="plaintext"> free cdData</span>
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768
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<pre style="margin: 0;">-<span id="LC768" class="line" lang="plaintext"> free hs_lpol</span>
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769
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715
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<pre style="margin: 0;"> <span id="LC715" class="line" lang="plaintext"> error "unexpected case in `startCBResult'"</span>
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770
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716
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<pre style="margin: 0;"> <span id="LC716" class="line" lang="plaintext"> where dbgMsg s = s ++ " (" ++ show h ++ ":" ++ show offset ++ ")"</span>
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771
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717
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<pre style="margin: 0;"> <span id="LC717" class="line" lang="plaintext"> -- Wait for .25ms (threaded) and 1ms (non-threaded)</span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1099" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1045" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1099,15 +1045,17 @@ processCompletion Manager{..} n delay = do</td>
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1099
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1045
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<pre style="margin: 0;"> <span id="LC1045" class="line" lang="plaintext"> do debugIO $ "exchanged: " ++ show oldDataPtr</span>
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1100
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1046
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<pre style="margin: 0;"> <span id="LC1046" class="line" lang="plaintext"> payload <- peek oldDataPtr :: IO CompletionData</span>
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1101
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1047
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<pre style="margin: 0;"> <span id="LC1047" class="line" lang="plaintext"> let !cb = cdCallback payload</span>
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1102
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<pre style="margin: 0;">-<span id="LC1102" class="line" lang="plaintext"> free oldDataPtr</span>
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1103
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1048
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<pre style="margin: 0;"> <span id="LC1048" class="line" lang="plaintext"> reqs <- removeRequest</span>
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1104
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1049
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<pre style="margin: 0;"> <span id="LC1049" class="line" lang="plaintext"> debugIO $ "-1.. " ++ show reqs ++ " requests queued."</span>
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1105
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1050
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<pre style="margin: 0;"> <span id="LC1050" class="line" lang="plaintext"> status <- FFI.overlappedIOStatus (lpOverlapped oe)</span>
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1106
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1051
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<pre style="margin: 0;"> <span id="LC1051" class="line" lang="plaintext"> -- TODO: Remap between STATUS_ and ERROR_ instead</span>
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1107
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1052
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<pre style="margin: 0;"> <span id="LC1052" class="line" lang="plaintext"> -- of re-interpret here. But for now, don't care.</span>
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1108
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1053
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<pre style="margin: 0;"> <span id="LC1053" class="line" lang="plaintext"> let status' = fromIntegral status</span>
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1054
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<pre style="margin: 0;">+<span id="LC1054" class="line" lang="plaintext"> -- We no longer explicitly free the memory, this is because we</span>
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1055
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<pre style="margin: 0;">+<span id="LC1055" class="line" lang="plaintext"> -- now require the callback to free the memory since the</span>
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1056
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<pre style="margin: 0;">+<span id="LC1056" class="line" lang="plaintext"> -- callback allocated it. This allows us to simplify memory</span>
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1057
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<pre style="margin: 0;">+<span id="LC1057" class="line" lang="plaintext"> -- management and reduce bugs. See Note [Memory Management].</span>
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1109
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1058
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<pre style="margin: 0;"> <span id="LC1058" class="line" lang="plaintext"> cb status' (dwNumberOfBytesTransferred oe)</span>
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1110
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<pre style="margin: 0;">-<span id="LC1110" class="line" lang="plaintext"> free hs_lpol</span>
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1111
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1059
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<pre style="margin: 0;"> <span id="LC1059" class="line" lang="plaintext"></span>
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1112
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1060
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<pre style="margin: 0;"> <span id="LC1060" class="line" lang="plaintext"> -- clear the array so we don't erroneously interpret the output, in</span>
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1113
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1061
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<pre style="margin: 0;"> <span id="LC1061" class="line" lang="plaintext"> -- certain circumstances like lockFileEx the code could return 1 entry</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c1f4f81d3a439cd1a8128e4ab11c7caac7cc0ad8#90b209a4e0e40fe3748bc7d31074e8804ee2bbc9"><strong>libraries/base/GHC/Event/Windows/FFI.hsc</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -30,6 +30,11 @@ module GHC.Event.Windows.FFI (</td>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext"> postQueuedCompletionStatus,</span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext"> getOverlappedResult,</span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext"> -- * Completion Data</span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext"> CompletionData(..),</span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext"> CompletionCallback,</span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="plaintext"> withRequest,</span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext"> -- * Overlapped</span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="plaintext"> OVERLAPPED,</span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="plaintext"> LPOVERLAPPED,</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -215,6 +220,51 @@ postQueuedCompletionStatus iocp numBytes completionKey lpol =</td>
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="plaintext"> failIfFalse_ "PostQueuedCompletionStatus" $</span>
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="plaintext"> c_PostQueuedCompletionStatus iocp numBytes completionKey lpol</span>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC223" class="line" lang="plaintext">------------------------------------------------------------------------</span>
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<pre style="margin: 0;">+<span id="LC224" class="line" lang="plaintext">-- Completion Data</span>
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<pre style="margin: 0;">+<span id="LC225" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC226" class="line" lang="plaintext">-- | Called when the completion is delivered.</span>
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<pre style="margin: 0;">+<span id="LC227" class="line" lang="plaintext">type CompletionCallback a = ErrCode -- ^ 0 indicates success</span>
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<pre style="margin: 0;">+<span id="LC228" class="line" lang="plaintext"> -> DWORD -- ^ Number of bytes transferred</span>
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<pre style="margin: 0;">+<span id="LC229" class="line" lang="plaintext"> -> IO a</span>
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<pre style="margin: 0;">+<span id="LC230" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC231" class="line" lang="plaintext">-- | Callback type that will be called when an I/O operation completes.</span>
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<pre style="margin: 0;">+<span id="LC232" class="line" lang="plaintext">type IOCallback = CompletionCallback ()</span>
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<pre style="margin: 0;">+<span id="LC233" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC234" class="line" lang="plaintext">-- | Wrap the IOCallback type into a FunPtr.</span>
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<pre style="margin: 0;">+<span id="LC235" class="line" lang="plaintext">foreign import ccall "wrapper"</span>
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="plaintext"> wrapIOCallback :: IOCallback -> IO (FunPtr IOCallback)</span>
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="plaintext">-- | Unwrap a FunPtr IOCallback to a normal Haskell function.</span>
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<pre style="margin: 0;">+<span id="LC239" class="line" lang="plaintext">foreign import ccall "dynamic"</span>
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<pre style="margin: 0;">+<span id="LC240" class="line" lang="plaintext"> mkIOCallback :: FunPtr IOCallback -> IOCallback</span>
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<pre style="margin: 0;">+<span id="LC241" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC242" class="line" lang="plaintext">-- | Structure that the I/O manager uses to associate callbacks with</span>
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<pre style="margin: 0;">+<span id="LC243" class="line" lang="plaintext">-- additional payload such as their OVERLAPPED structure and Win32 handle</span>
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<pre style="margin: 0;">+<span id="LC244" class="line" lang="plaintext">-- etc. *Must* be kept in sync with that in `winio_structs.h` or horrible things</span>
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245
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<pre style="margin: 0;">+<span id="LC245" class="line" lang="plaintext">-- happen.</span>
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246
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<pre style="margin: 0;">+<span id="LC246" class="line" lang="plaintext">--</span>
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247
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<pre style="margin: 0;">+<span id="LC247" class="line" lang="plaintext">-- We keep the handle around for the benefit of ghc-external libraries making</span>
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248
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<pre style="margin: 0;">+<span id="LC248" class="line" lang="plaintext">-- use of the manager.</span>
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249
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<pre style="margin: 0;">+<span id="LC249" class="line" lang="plaintext">data CompletionData = CompletionData { cdHandle :: !HANDLE</span>
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250
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<pre style="margin: 0;">+<span id="LC250" class="line" lang="plaintext"> , cdCallback :: !IOCallback</span>
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251
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<pre style="margin: 0;">+<span id="LC251" class="line" lang="plaintext"> }</span>
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252
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<pre style="margin: 0;">+<span id="LC252" class="line" lang="plaintext"></span>
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253
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<pre style="margin: 0;">+<span id="LC253" class="line" lang="plaintext">instance Storable CompletionData where</span>
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254
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<pre style="margin: 0;">+<span id="LC254" class="line" lang="plaintext"> sizeOf _ = #{size CompletionData}</span>
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255
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<pre style="margin: 0;">+<span id="LC255" class="line" lang="plaintext"> alignment _ = #{alignment CompletionData}</span>
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256
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<pre style="margin: 0;">+<span id="LC256" class="line" lang="plaintext"></span>
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257
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<pre style="margin: 0;">+<span id="LC257" class="line" lang="plaintext"> peek ptr = do</span>
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258
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<pre style="margin: 0;">+<span id="LC258" class="line" lang="plaintext"> cdCallback <- mkIOCallback `fmap` #{peek CompletionData, cdCallback} ptr</span>
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259
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<pre style="margin: 0;">+<span id="LC259" class="line" lang="plaintext"> cdHandle <- #{peek CompletionData, cdHandle} ptr</span>
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260
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<pre style="margin: 0;">+<span id="LC260" class="line" lang="plaintext"> let !cd = CompletionData{..}</span>
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261
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="plaintext"> return cd</span>
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262
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="plaintext"></span>
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263
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="plaintext"> poke ptr CompletionData{..} = do</span>
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264
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="plaintext"> cb <- wrapIOCallback cdCallback</span>
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265
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<pre style="margin: 0;">+<span id="LC265" class="line" lang="plaintext"> #{poke CompletionData, cdCallback} ptr cb</span>
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266
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<pre style="margin: 0;">+<span id="LC266" class="line" lang="plaintext"> #{poke CompletionData, cdHandle} ptr cdHandle</span>
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267
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="plaintext"></span>
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218
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268
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<pre style="margin: 0;"> <span id="LC268" class="line" lang="plaintext">------------------------------------------------------------------------</span>
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219
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269
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="plaintext">-- Overlapped</span>
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220
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270
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<pre style="margin: 0;"> <span id="LC270" class="line" lang="plaintext"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -293,6 +343,30 @@ pokeOffsetOverlapped lpol offset = do</td>
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<pre style="margin: 0;"> <span id="LC343" class="line" lang="plaintext"> #{poke OVERLAPPED, OffsetHigh} lpol offsetHigh</span>
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<pre style="margin: 0;"> <span id="LC344" class="line" lang="plaintext">{-# INLINE pokeOffsetOverlapped #-}</span>
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<pre style="margin: 0;"> <span id="LC345" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC346" class="line" lang="plaintext">------------------------------------------------------------------------</span>
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<pre style="margin: 0;">+<span id="LC347" class="line" lang="plaintext">-- Request management</span>
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<pre style="margin: 0;">+<span id="LC348" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="plaintext">withRequest :: Word64 -> CompletionData</span>
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<pre style="margin: 0;">+<span id="LC350" class="line" lang="plaintext"> -> (Ptr HASKELL_OVERLAPPED -> Ptr CompletionData -> IO a)</span>
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<pre style="margin: 0;">+<span id="LC351" class="line" lang="plaintext"> -> IO a</span>
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="plaintext">withRequest offset cbData f =</span>
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="plaintext"> -- Create the completion record and store it.</span>
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="plaintext"> -- We only need the record when we enqueue a request, however if we</span>
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="plaintext"> -- delay creating it then we will run into a race condition where the</span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="plaintext"> -- driver may have finished servicing the request before we were ready</span>
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<pre style="margin: 0;">+<span id="LC357" class="line" lang="plaintext"> -- and so the request won't have the book keeping information to know</span>
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<pre style="margin: 0;">+<span id="LC358" class="line" lang="plaintext"> -- what to do. So because of that we always create the payload, If we</span>
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<pre style="margin: 0;">+<span id="LC359" class="line" lang="plaintext"> -- need it ok, if we don't that's no problem. This approach prevents</span>
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<pre style="margin: 0;">+<span id="LC360" class="line" lang="plaintext"> -- expensive lookups in hash-tables.</span>
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<pre style="margin: 0;">+<span id="LC361" class="line" lang="plaintext"> --</span>
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="plaintext"> -- Todo: Use a memory pool for this so we don't have to hit malloc every</span>
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<pre style="margin: 0;">+<span id="LC363" class="line" lang="plaintext"> -- time. This would allow us to scale better.</span>
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<pre style="margin: 0;">+<span id="LC364" class="line" lang="plaintext"> allocaBytes #{size HASKELL_OVERLAPPED} $ \hs_lpol -></span>
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<pre style="margin: 0;">+<span id="LC365" class="line" lang="plaintext"> with cbData $ \cdData -> do</span>
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="plaintext"> zeroOverlapped hs_lpol</span>
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<pre style="margin: 0;">+<span id="LC367" class="line" lang="plaintext"> pokeOffsetOverlapped (castPtr hs_lpol) offset</span>
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="plaintext"> f hs_lpol cdData</span>
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369
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="plaintext"></span>
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370
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<pre style="margin: 0;"> <span id="LC370" class="line" lang="plaintext">------------------------------------------------------------------------</span>
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371
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<pre style="margin: 0;"> <span id="LC371" class="line" lang="plaintext">-- Cancel pending I/O</span>
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372
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<pre style="margin: 0;"> <span id="LC372" class="line" lang="plaintext"></span>
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