[Haskell-cafe] Re: Hugs vs GHC (again)

Gracjan Polak gracjan at acchsh.com
Tue Jan 11 08:49:27 EST 2005

Marcin 'Qrczak' Kowalczyk wrote:
 > "fileRead :: File -> FileOffset -> Integer -> Buffer -> IO ()"
 > This is unimplementable safely if the descriptor is read concurrently
 > by different processes. The current position is shared.

UNIX98 defines function:

extern ssize_t pread (int __fd, void *__buf, size_t __nbytes,
                       __off_t __offset);

Windows has:

BOOL ReadFile(
   HANDLE hFile,
   LPVOID lpBuffer,
   DWORD nNumberOfBytesToRead,
   LPDWORD lpNumberOfBytesRead,
   LPOVERLAPPED lpOverlapped

Where that OVERLAPPED structure contains information where to start read.

Seems implementable to me, or am I wrong?


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