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* spinlock.c (__pthread_unlock): Don"t crash if called for an
	untaken mutex.  Reported by Ruslan V. Brushkoff <rus@Snif.Te.Net.UA>.
This commit is contained in:
Ulrich Drepper 1998-12-14 16:33:50 +00:00
parent 60876a7544
commit fbaf6e72d6
2 changed files with 8 additions and 3 deletions
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3
linuxthreads/ChangeLog
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@ -1,5 +1,8 @@
1998-12-14 Ulrich Drepper <drepper@cygnus.com> 1998-12-14 Ulrich Drepper <drepper@cygnus.com>
* spinlock.c (__pthread_unlock): Don"t crash if called for an
untaken mutex. Reported by Ruslan V. Brushkoff <rus@Snif.Te.Net.UA>.
* Examples/ex6.c: Unbuffer stdout and reduce sleep time to reduce * Examples/ex6.c: Unbuffer stdout and reduce sleep time to reduce
overall runtime. overall runtime.

8
linuxthreads/spinlock.c
View File

@ -65,9 +65,11 @@ void internal_function __pthread_unlock(struct _pthread_fastlock * lock)
again: again:
oldstatus = lock->__status; oldstatus = lock->__status;
if (oldstatus == 1) { if (oldstatus == 0 || oldstatus == 1) {
/* No threads are waiting for this lock */ /* No threads are waiting for this lock. Please note that we also
if (! compare_and_swap(&lock->__status, 1, 0, &lock->__spinlock)) enter this case if the lock is not taken at all. If this wouldn't
be done here we would crash further down. */
if (! compare_and_swap(&lock->__status, oldstatus, 0, &lock->__spinlock))
goto again; goto again;
return; return;
} }