Author: davidxu
Date: Fri Aug 20 04:28:30 2010
New Revision: 211523
URL: http://svn.freebsd.org/changeset/base/211523
Log:
If thread set a TDP_WAKEUP for itself, clears the flag and returns EINTR
immediately, this is used for implementing reliable pthread cancellation.
Modified:
head/sys/kern/subr_sleepqueue.c
Modified: head/sys/kern/subr_sleepqueue.c
==============================================================================
--- head/sys/kern/subr_sleepqueue.c Fri Aug 20 04:15:05 2010
(r211522)
+++ head/sys/kern/subr_sleepqueue.c Fri Aug 20 04:28:30 2010
(r211523)
@@ -408,6 +408,12 @@ sleepq_catch_signals(void *wchan, int pr
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 pr
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.
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