[platform] Implement a worker pool

test/cctest/test-libplatform-task-queue.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * 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
@@ skipping 10 matching lines @@
 // 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 "v8.h"
 
 #include "cctest.h"
-#include "cpu.h"
+#include "libplatform/task-queue.h"
+#include "test-libplatform.h"
 
 using namespace v8::internal;
 
 
-TEST(FeatureImplications) {
-  // Test for features implied by other features.
-  CPU cpu;
+TEST(TaskQueueBasic) {
+  TaskCounter task_counter;
 
-  // ia32 and x64 features
-  CHECK(!cpu.has_sse() || cpu.has_mmx());
-  CHECK(!cpu.has_sse2() || cpu.has_sse());
-  CHECK(!cpu.has_sse3() || cpu.has_sse2());
-  CHECK(!cpu.has_ssse3() || cpu.has_sse3());
-  CHECK(!cpu.has_sse41() || cpu.has_sse3());
-  CHECK(!cpu.has_sse42() || cpu.has_sse41());
+  TaskQueue queue;
 
-  // arm features
-  CHECK(!cpu.has_vfp3_d32() || cpu.has_vfp3());
+  TestTask* task = new TestTask(&task_counter);
+  queue.Append(task);
+  CHECK_EQ(1, task_counter.GetCount());
+  CHECK_EQ(task, queue.GetNext());
+  delete task;
+  CHECK_EQ(0, task_counter.GetCount());
+
+  queue.Terminate();
+  CHECK_EQ(NULL, queue.GetNext());
 }
 
 
-TEST(NumberOfProcessorsOnline) {
-  CHECK_GT(CPU::NumberOfProcessorsOnline(), 0);
+class ReadQueueTask : public TestTask {
+ public:
+  ReadQueueTask(TaskCounter* task_counter, TaskQueue* queue)
+      : TestTask(task_counter, true), queue_(queue) {}
+  virtual ~ReadQueueTask() {}
+
+  virtual void Run() V8_OVERRIDE {
+    TestTask::Run();
+    CHECK_EQ(NULL, queue_->GetNext());
+  }
+
+ private:
+  TaskQueue* queue_;
+
+  DISALLOW_COPY_AND_ASSIGN(ReadQueueTask);
+};
+
+
+TEST(TaskQueueTerminateMultipleReaders) {
+  TaskQueue queue;
+  TaskCounter task_counter;
+  ReadQueueTask* read1 = new ReadQueueTask(&task_counter, &queue);
+  ReadQueueTask* read2 = new ReadQueueTask(&task_counter, &queue);
+
+  TestWorkerThread thread1(read1);
+  TestWorkerThread thread2(read2);
+
+  thread1.Start();
+  thread2.Start();
+
+  CHECK_EQ(2, task_counter.GetCount());
+
+  thread1.Signal();
+  thread2.Signal();
+
+  queue.Terminate();
+
+  thread1.Join();
+  thread2.Join();
+
+  CHECK_EQ(0, task_counter.GetCount());
 }