Changeset 44651 in webkit for trunk/JavaScriptCore/wtf/Threading.h

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/Threading.h (modified) (4 diffs)

trunk/JavaScriptCore/wtf/Threading.h

@@ -127 +127 @@
 #if USE(PTHREADS)
 typedef pthread_mutex_t PlatformMutex;
+typedef pthread_rwlock_t PlatformReadWriteLock;
 typedef pthread_cond_t PlatformCondition;
 #elif PLATFORM(GTK)
 typedef GOwnPtr<GMutex> PlatformMutex;
+typedef void* PlatformReadWriteLock; // FIXME: Implement.
 typedef GOwnPtr<GCond> PlatformCondition;
 #elif PLATFORM(QT)
 typedef QT_PREPEND_NAMESPACE(QMutex)* PlatformMutex;
+typedef void* PlatformReadWriteLock; // FIXME: Implement.
 typedef QT_PREPEND_NAMESPACE(QWaitCondition)* PlatformCondition;
 #elif PLATFORM(WIN_OS)
@@ -139 +142 @@
     size_t m_recursionCount;
 };
+typedef void* PlatformReadWriteLock; // FIXME: Implement.
 struct PlatformCondition {
     size_t m_waitersGone;
@@ -152 +156 @@
 #else
 typedef void* PlatformMutex;
+typedef void* PlatformReadWriteLock;
 typedef void* PlatformCondition;
 #endif
@@ -171 +176 @@
 
 typedef Locker<Mutex> MutexLocker;
+
+class ReadWriteLock : Noncopyable {
+public:
+    ReadWriteLock();
+    ~ReadWriteLock();
+
+    void readLock();
+    bool tryReadLock();
+
+    void writeLock();
+    bool tryWriteLock();
+    
+    void unlock();
+
+private:
+    PlatformReadWriteLock m_readWriteLock;
+};
 
 class ThreadCondition : Noncopyable {