• sof's avatar
    [project @ 2003-02-21 05:34:12 by sof] · 5b4f5a6a
    sof authored
    Asynchronous / non-blocking I/O for Win32 platforms.
    
    This commit introduces a Concurrent Haskell friendly view of I/O on
    Win32 platforms. Through the use of a pool of worker Win32 threads, CH
    threads may issue asynchronous I/O requests without blocking the
    progress of other CH threads. The issuing CH thread is blocked until
    the request has been serviced though.
    
    GHC.Conc exports the primops that take care of issuing the
    asynchronous I/O requests, which the IO implementation now takes
    advantage of. By default, all Handles are non-blocking/asynchronous,
    but should performance become an issue, having a per-Handle flag for
    turning off non-blocking could easily be imagined&introduced.
    
    [Incidentally, this thread pool-based implementation could easily be
    extended to also allow Haskell code to delegate the execution of
    arbitrary pieces of (potentially blocking) external code to another OS
    thread. Given how relatively gnarly the locking story has turned out
    to be with the 'threaded' RTS, that may not be such a bad idea.]
    5b4f5a6a
StgMiscClosures.h 9.39 KB