JehanneOS/newlib
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Fix a race in pthread_rwlock caused by simultanoues unlock and cancelation.

Browse Source 
* thread.h (pthread_rwlock::release): New method.
* thread.cc (pthread_rwlock::unlock): Use release to signal
waiting threads.
(pthread_rwlock::rdlock_cleanup): Signal waiting threads after a
cancelation.
(pthread_rwlock::wrlock_cleanup): Ditto.
This commit is contained in:
Thomas Pfaff
2003-04-15 20:14:12 +00:00
parent cfd2c7bea8
commit ffb576fbf2
3 changed files with 24 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
winsup/cygwin/thread.cc
View File

@ -1210,13 +1210,7 @@ pthread_rwlock::unlock ()
delete reader;
}
if (waiting_writers)
{
if (!readers)
cond_writers.unblock (false);
}
else if (waiting_readers)
cond_readers.unblock (true);
release ();
DONE:
mtx.unlock ();
@ -1263,6 +1257,7 @@ pthread_rwlock::rdlock_cleanup (void *arg)
pthread_rwlock *rwlock = (pthread_rwlock *) arg;
--(rwlock->waiting_readers);
rwlock->release ();
rwlock->mtx.unlock ();
}
@ -1272,6 +1267,7 @@ pthread_rwlock::wrlock_cleanup (void *arg)
pthread_rwlock *rwlock = (pthread_rwlock *) arg;
--(rwlock->waiting_writers);
rwlock->release ();
rwlock->mtx.unlock ();
}