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Fix a bug with starting of asynchronous processes (#18464)

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The asynchronous process completion handler callback should be called
only once. This is achieved by passing `WT_EXECUTEONLYONCE` flag to the
`registerWaitForSingleObject` Windows API procedure.

Related to cheatfate/asynctools#35
This commit is contained in:
Ivan Bobev 2021-07-09 03:26:49 +03:00 • committed by GitHub
commit 86f5a56fcd
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lib/pure/asyncdispatch.nim
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@ -1022,7 +1022,7 @@ when defined(windows) or defined(nimdoc):
raiseOSError(osLastError())
var pcd = cast[PostCallbackDataPtr](allocShared0(sizeof(PostCallbackData)))
var flags = WT_EXECUTEINWAITTHREAD.DWORD
var flags = WT_EXECUTEINWAITTHREAD.DWORD or WT_EXECUTEONLYONCE.DWORD
proc proccb(fd: AsyncFD, bytesCount: DWORD, errcode: OSErrorCode) =
closeWaitable(hProcess)