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Fix race condition in empth_sleep() for Windows

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Calculation of sleep duration tried to protect against integer
underflow, but the protection was racy.  Rewrite the whole thing.
This commit is contained in:
Markus Armbruster 2009-06-14 18:48:38 +02:00
parent 9ee9eb3234
commit 3ce0cea94c
1 changed files with 12 additions and 11 deletions
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23
src/lib/empthread/ntthread.c
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@ -609,23 +609,24 @@ empth_wakeup(empth_t *pThread)
int
empth_sleep(time_t until)
{
long lSec = until - time(0) > 0 ? until - time(0) : 0;
time_t now;
long lSec;
empth_t *pThread = TlsGetValue(dwTLSIndex);
int iReturn = 0;
DWORD result;
loc_BlockThisThread();
do {
loc_BlockThisThread();
now = time(NULL);
lSec = until >= now ? until - now : 0;
loc_debug("going to sleep %ld sec", lSec);
result = WaitForSingleObject(pThread->hThreadEvent, lSec * 1000L);
} while (result != WAIT_TIMEOUT && result != WAIT_OBJECT_0);
if (WaitForSingleObject(pThread->hThreadEvent, lSec * 1000L) !=
WAIT_TIMEOUT)
iReturn = -1;
loc_debug("sleep done. Waiting to run.");
loc_RunThisThread(NULL);
loc_debug("sleep done. Waiting to run.");
loc_RunThisThread(NULL);
} while (!iReturn && ((lSec = until - time(0)) > 0));
return iReturn;
return result == WAIT_TIMEOUT ? 0 : -1;
}
/************************