--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKitTools/DumpRenderTree/pthreads/JavaScriptThreadingPthreads.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,138 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Apple Inc. All rights reserved.
+ *           (C) 2007 Graham Dennis (graham.dennis@gmail.com)
+ *           (C) 2007 Eric Seidel <eric@webkit.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer. 
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution. 
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+ 
+#include "config.h"
+#include "JavaScriptThreading.h"
+
+#include <CoreFoundation/CoreFoundation.h>
+#include <JavaScriptCore/JavaScriptCore.h>
+#include <pthread.h>
+#include <wtf/Assertions.h>
+#include <wtf/HashSet.h>
+
+static pthread_mutex_t javaScriptThreadsMutex = PTHREAD_MUTEX_INITIALIZER;
+static bool javaScriptThreadsShouldTerminate;
+
+static const int javaScriptThreadsCount = 4;
+
+typedef HashSet<pthread_t> ThreadSet;
+
+static ThreadSet* javaScriptThreads()
+{
+    ASSERT(pthread_mutex_trylock(&javaScriptThreadsMutex) == EBUSY);
+    static ThreadSet staticJavaScriptThreads;
+    return &staticJavaScriptThreads;
+}
+
+// Loops forever, running a script and randomly respawning, until 
+// javaScriptThreadsShouldTerminate becomes true.
+void* runJavaScriptThread(void* arg)
+{
+    const char* const script =
+        "var array = [];"
+        "for (var i = 0; i < 10; i++) {"
+        "    array.push(String(i));"
+        "}";
+
+    while (1) {
+        JSGlobalContextRef ctx = JSGlobalContextCreate(0);
+        JSStringRef scriptRef = JSStringCreateWithUTF8CString(script);
+
+        JSValueRef exception = 0;
+        JSEvaluateScript(ctx, scriptRef, 0, 0, 1, &exception);
+        ASSERT(!exception);
+
+        JSGarbageCollect(ctx);
+        JSGlobalContextRelease(ctx);
+        JSStringRelease(scriptRef);
+        
+        JSGarbageCollect(0);
+
+        pthread_mutex_lock(&javaScriptThreadsMutex);
+
+        // Check for cancellation.
+        if (javaScriptThreadsShouldTerminate) {
+            javaScriptThreads()->remove(pthread_self());
+            pthread_mutex_unlock(&javaScriptThreadsMutex);
+            return 0;
+        }
+
+        // Respawn probabilistically.
+        if (random() % 5 == 0) {
+            pthread_t pthread;
+            pthread_create(&pthread, 0, &runJavaScriptThread, 0);
+            pthread_detach(pthread);
+
+            javaScriptThreads()->remove(pthread_self());
+            javaScriptThreads()->add(pthread);
+
+            pthread_mutex_unlock(&javaScriptThreadsMutex);
+            return 0;
+        }
+
+        pthread_mutex_unlock(&javaScriptThreadsMutex);
+    }
+}
+
+void startJavaScriptThreads()
+{
+    pthread_mutex_lock(&javaScriptThreadsMutex);
+
+    for (int i = 0; i < javaScriptThreadsCount; i++) {
+        pthread_t pthread;
+        pthread_create(&pthread, 0, &runJavaScriptThread, 0);
+        pthread_detach(pthread);
+        javaScriptThreads()->add(pthread);
+    }
+
+    pthread_mutex_unlock(&javaScriptThreadsMutex);
+}
+
+void stopJavaScriptThreads()
+{
+    pthread_mutex_lock(&javaScriptThreadsMutex);
+
+    javaScriptThreadsShouldTerminate = true;
+
+    ASSERT(javaScriptThreads()->size() == javaScriptThreadsCount);
+
+    pthread_mutex_unlock(&javaScriptThreadsMutex);
+
+    while (true) {
+        pthread_mutex_lock(&javaScriptThreadsMutex);
+        int threadCount = javaScriptThreads()->size();
+        pthread_mutex_unlock(&javaScriptThreadsMutex);
+
+        if (!threadCount)
+            break;
+
+        usleep(1000);
+    }
+}