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poll: honor the timeout on Win32

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Ensure that when passing a pipe, the gnulib poll replacement will not
return 0 before the timeout has passed.

Not obeying the timeout (and merely returning 0) causes pathological
behavior when preparing a packfile for a repository and taking a
long time to do so.  If poll were to return 0 immediately, this would
cause keep-alives to get sent as quickly as possible until the packfile
was created.  Such deviance from the standard would cause megabytes (or
more) of keep-alive packets to be sent.

GetTickCount is used as it is efficient, stable and monotonically
increasing.  (Neither GetSystemTime nor QueryPerformanceCounter have
all three of these properties.)

Signed-off-by: Edward Thomson <ethomson@microsoft.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Edward Thomson 2015-09-12 17:50:26 +00:00 committed by Junio C Hamano
parent 689efb737a
commit ef8b53e78c
1 changed files with 14 additions and 2 deletions
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16
compat/poll/poll.c
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@ -446,7 +446,7 @@ poll (struct pollfd *pfd, nfds_t nfd, int timeout)
static HANDLE hEvent;
WSANETWORKEVENTS ev;
HANDLE h, handle_array[FD_SETSIZE + 2];
DWORD ret, wait_timeout, nhandles;
DWORD ret, wait_timeout, nhandles, start = 0, elapsed, orig_timeout = 0;
fd_set rfds, wfds, xfds;
BOOL poll_again;
MSG msg;
@ -459,6 +459,12 @@ poll (struct pollfd *pfd, nfds_t nfd, int timeout)
return -1;
}
if (timeout != INFTIM)
{
orig_timeout = timeout;
start = GetTickCount();
}
if (!hEvent)
hEvent = CreateEvent (NULL, FALSE, FALSE, NULL);
@ -603,7 +609,13 @@ restart:
rc++;
}
if (!rc && timeout == INFTIM)
if (!rc && orig_timeout && timeout != INFTIM)
{
elapsed = GetTickCount() - start;
timeout = elapsed >= orig_timeout ? 0 : orig_timeout - elapsed;
}
if (!rc && timeout)
{
SleepEx (1, TRUE);
goto restart;