Changeset 44651 in webkit for trunk/JavaScriptCore/wtf/ThreadingPthreads.cpp

Timestamp:

Jun 13, 2009, 10:52:44 AM (16 years ago)

Author:

[email protected]

Message:

2009-06-12 Dave Hyatt <​[email protected]>

Reviewed by Anders Carlsson.

​https://bugs.webkit.org/show_bug.cgi?id=26373

Add a new class to Threading in wtf called ReadWriteLock that handles single writer/multiple reader locking.
Provide a pthreads-only implementation of the lock for now, as this class is only going to be used
on Snow Leopard at first.

• wtf/Threading.h: (WTF::ReadWriteLock::impl):
• wtf/ThreadingPthreads.cpp: (WTF::ReadWriteLock::ReadWriteLock): (WTF::ReadWriteLock::~ReadWriteLock): (WTF::ReadWriteLock::readLock): (WTF::ReadWriteLock::tryReadLock): (WTF::ReadWriteLock::writeLock): (WTF::ReadWriteLock::tryWriteLock): (WTF::ReadWriteLock::unlock):

File:

• trunk/JavaScriptCore/wtf/ThreadingPthreads.cpp (modified) (1 diff)

trunk/JavaScriptCore/wtf/ThreadingPthreads.cpp

@@ -268 +268 @@
 }
 
+
+ReadWriteLock::ReadWriteLock()
+{
+    pthread_rwlock_init(&m_readWriteLock, NULL);
+}
+
+ReadWriteLock::~ReadWriteLock()
+{
+    pthread_rwlock_destroy(&m_readWriteLock);
+}
+
+void ReadWriteLock::readLock()
+{
+    int result = pthread_rwlock_rdlock(&m_readWriteLock);
+    ASSERT_UNUSED(result, !result);
+}
+
+bool ReadWriteLock::tryReadLock()
+{
+    int result = pthread_rwlock_tryrdlock(&m_readWriteLock);
+
+    if (result == 0)
+        return true;
+    if (result == EBUSY || result == EAGAIN)
+        return false;
+
+    ASSERT_NOT_REACHED();
+    return false;
+}
+
+void ReadWriteLock::writeLock()
+{
+    int result = pthread_rwlock_wrlock(&m_readWriteLock);
+    ASSERT_UNUSED(result, !result);
+}
+
+bool ReadWriteLock::tryWriteLock()
+{
+    int result = pthread_rwlock_trywrlock(&m_readWriteLock);
+
+    if (result == 0)
+        return true;
+    if (result == EBUSY || result == EAGAIN)
+        return false;
+
+    ASSERT_NOT_REACHED();
+    return false;
+}
+
+void ReadWriteLock::unlock()
+{
+    int result = pthread_rwlock_unlock(&m_readWriteLock);
+    ASSERT_UNUSED(result, !result);
+}
+
 ThreadCondition::ThreadCondition()
 {