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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer
     12  *    in the documentation and/or other materials provided with the
     13  *    distribution.
     14  * 3. Neither the name of Google Inc. nor the names of its contributors
     15  *    may be used to endorse or promote products derived from this
     16  *    software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "core/dom/Microtask.h"
     33 
     34 #include "bindings/core/v8/V8PerIsolateData.h"
     35 #include "bindings/core/v8/V8RecursionScope.h"
     36 #include "platform/Task.h"
     37 #include "public/platform/WebThread.h"
     38 #include <v8.h>
     39 
     40 namespace blink {
     41 
     42 void Microtask::performCheckpoint()
     43 {
     44     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     45     V8PerIsolateData* isolateData = V8PerIsolateData::from(isolate);
     46     ASSERT(isolateData);
     47     if (isolateData->recursionLevel() || isolateData->performingMicrotaskCheckpoint() || isolateData->destructionPending())
     48         return;
     49     isolateData->setPerformingMicrotaskCheckpoint(true);
     50     {
     51         // Ensure that end-of-task-or-microtask actions are performed.
     52         V8RecursionScope recursionScope(isolate);
     53         isolate->RunMicrotasks();
     54     }
     55     isolateData->setPerformingMicrotaskCheckpoint(false);
     56 }
     57 
     58 bool Microtask::performingCheckpoint(v8::Isolate* isolate)
     59 {
     60     return V8PerIsolateData::from(isolate)->performingMicrotaskCheckpoint();
     61 }
     62 
     63 static void microtaskFunctionCallback(void* data)
     64 {
     65     OwnPtr<WebThread::Task> task = adoptPtr(static_cast<WebThread::Task*>(data));
     66     task->run();
     67 }
     68 
     69 void Microtask::enqueueMicrotask(PassOwnPtr<WebThread::Task> callback)
     70 {
     71     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     72     isolate->EnqueueMicrotask(&microtaskFunctionCallback, callback.leakPtr());
     73 }
     74 
     75 void Microtask::enqueueMicrotask(const Closure& callback)
     76 {
     77     enqueueMicrotask(adoptPtr(new Task(callback)));
     78 }
     79 
     80 } // namespace blink
     81