Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285)

1 files changed, 148 insertions, 0 deletions

diff --git a/Tools/DumpRenderTree/pthreads/JavaScriptThreadingPthreads.cpp b/Tools/DumpRenderTree/pthreads/JavaScriptThreadingPthreads.cpp
new file mode 100644
index 000000000..1266c020e
--- /dev/null
+++ b/Tools/DumpRenderTree/pthreads/JavaScriptThreadingPthreads.cpp
@@ -0,0 +1,148 @@
+/*
+ * 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 JSContextGroupRef javaScriptThreadsGroup;
+
+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;
+}
+
+// This function exercises JSC in a loop until javaScriptThreadsShouldTerminate
+// becomes true or it probabilistically decides to spawn a replacement thread and exit.
+void* runJavaScriptThread(void* arg)
+{
+    static const char* const script =
+        "var array = [];"
+        "for (var i = 0; i < 1024; i++) {"
+        "    array.push(String(i));"
+        "}";
+
+    pthread_mutex_lock(&javaScriptThreadsMutex);
+    JSGlobalContextRef ctx = JSGlobalContextCreateInGroup(javaScriptThreadsGroup, 0);
+    pthread_mutex_unlock(&javaScriptThreadsMutex);
+
+    pthread_mutex_lock(&javaScriptThreadsMutex);
+    JSStringRef scriptRef = JSStringCreateWithUTF8CString(script);
+    pthread_mutex_unlock(&javaScriptThreadsMutex);
+
+    while (1) {
+        pthread_mutex_lock(&javaScriptThreadsMutex);
+        JSValueRef exception = 0;
+        JSEvaluateScript(ctx, scriptRef, 0, 0, 1, &exception);
+        ASSERT(!exception);
+        pthread_mutex_unlock(&javaScriptThreadsMutex);
+
+        pthread_mutex_lock(&javaScriptThreadsMutex);
+        size_t valuesCount = 1024;
+        JSValueRef values[valuesCount];
+        for (size_t i = 0; i < valuesCount; ++i)
+            values[i] = JSObjectMake(ctx, 0, 0);
+        pthread_mutex_unlock(&javaScriptThreadsMutex);
+
+        // Check for cancellation.
+        if (javaScriptThreadsShouldTerminate)
+            goto done;
+
+        // Respawn probabilistically.
+        if (random() % 5 == 0) {
+            pthread_mutex_lock(&javaScriptThreadsMutex);
+            pthread_t pthread;
+            pthread_create(&pthread, 0, &runJavaScriptThread, 0);
+            pthread_detach(pthread);
+            javaScriptThreads()->add(pthread);
+            pthread_mutex_unlock(&javaScriptThreadsMutex);
+            goto done;
+        }
+    }
+
+done:
+    pthread_mutex_lock(&javaScriptThreadsMutex);
+    JSStringRelease(scriptRef);
+    JSGarbageCollect(ctx);
+    JSGlobalContextRelease(ctx);
+    javaScriptThreads()->remove(pthread_self());
+    pthread_mutex_unlock(&javaScriptThreadsMutex);
+    return 0;
+}
+
+void startJavaScriptThreads()
+{
+    javaScriptThreadsGroup = JSContextGroupCreate();
+
+    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;
+
+    pthread_mutex_unlock(&javaScriptThreadsMutex);
+
+    while (true) {
+        pthread_mutex_lock(&javaScriptThreadsMutex);
+        int threadCount = javaScriptThreads()->size();
+        pthread_mutex_unlock(&javaScriptThreadsMutex);
+
+        if (!threadCount)
+            break;
+
+        usleep(1000);
+    }
+}