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authorUlrich Drepper <drepper@redhat.com>2003-02-24 09:23:15 +0000
committerUlrich Drepper <drepper@redhat.com>2003-02-24 09:23:15 +0000
commit18a535792b7a63721a123e152266c4b8cf1fae8e (patch)
treeb86a475d52a5cade9e9820808a7d8f165cf081aa /nptl/DESIGN-rwlock.txt
parent3724f268b15bdbd322cda97f88a965a68f2fd3ef (diff)
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Update.
* sysdeps/pthread/pthread_rwlock_rdlock.c: Likewise. * sysdeps/pthread/pthread_rwlock_timedrdlock.c: Likewise. * sysdeps/pthread/pthread_rwlock_timedwrlock.c: Likewise. * sysdeps/pthread/pthread_rwlock_unlock.c: Likewise. * sysdeps/pthread/pthread_rwlock_wrlock.c: Likewise.
Diffstat (limited to 'nptl/DESIGN-rwlock.txt')
-rw-r--r--nptl/DESIGN-rwlock.txt13
1 files changed, 6 insertions, 7 deletions
diff --git a/nptl/DESIGN-rwlock.txt b/nptl/DESIGN-rwlock.txt
index 6262a7a..d97c084 100644
--- a/nptl/DESIGN-rwlock.txt
+++ b/nptl/DESIGN-rwlock.txt
@@ -42,13 +42,12 @@ pthread_rwlock_rdlock(pthread_rwlock_t *rwlock)
break;
rwlock->nr_readers_queued++;
+ val = rwlock->readers_wakeup;
lll_unlock(rwlock->lock);
- futex_wait(&rwlock->readers_wakeup, 0)
+ futex_wait(&rwlock->readers_wakeup, val)
lll_lock(rwlock->lock);
- if (!--rwlock->nr_readers_queued)
- rwlock->readers_wakeup = 0;
}
rwlock->readers++;
lll_unlock(rwlock->lock);
@@ -73,13 +72,13 @@ pthread_rwlock_wrlock(pthread_rwlock_t *rwlock)
break;
rwlock->nr_writers_queued++;
+ val = rwlock->writer_wakeup;
lll_unlock(rwlock->lock);
- futex_wait(&rwlock->writer_wakeup, 0);
+ futex_wait(&rwlock->writer_wakeup, val);
lll_lock(rwlock->lock);
rwlock->nr_writers_queued--;
- rwlock->writer_wakeup = 0;
}
rwlock->writer = pthread_self();
lll_unlock(rwlock->lock);
@@ -96,11 +95,11 @@ pthread_rwlock_unlock(pthread_rwlock_t *rwlock)
if (!rwlock->readers) {
if (rwlock->nr_writers_queued) {
- rwlock->writer_wakeup = 1;
+ ++rwlock->writer_wakeup;
futex_wake(&rwlock->writer_wakeup, 1);
} else
if (rwlock->nr_readers_queued) {
- rwlock->readers_wakeup = 1;
+ ++rwlock->readers_wakeup;
futex_wake(&rwlock->readers_wakeup, MAX_INT);
}
}