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If thread set a TDP_WAKEUP for itself, clears the flag and returns EINTR

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immediately, this is used for implementing reliable pthread cancellation.
This commit is contained in:
davidxu 2010-08-20 04:28:30 +00:00
parent 07b66dcf06
commit 89f466d2b2
1 changed files with 7 additions and 0 deletions
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7
sys/kern/subr_sleepqueue.c
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@ -408,6 +408,12 @@ sleepq_catch_signals(void *wchan, int pri)
sc = SC_LOOKUP(wchan);
mtx_assert(&sc->sc_lock, MA_OWNED);
MPASS(wchan != NULL);
if ((td->td_pflags & TDP_WAKEUP) != 0) {
td->td_pflags &= ~TDP_WAKEUP;
ret = EINTR;
goto out;
}
/*
* See if there are any pending signals for this thread. If not
* we can switch immediately. Otherwise do the signal processing
@ -453,6 +459,7 @@ sleepq_catch_signals(void *wchan, int pri)
sleepq_switch(wchan, pri);
return (0);
}
out:
/*
* There were pending signals and this thread is still
* on the sleep queue, remove it from the sleep queue.