[platform] Implement a worker pool

test/cctest/test-libplatform.h

 // Copyright 2013 the V8 project authors. All rights reserved.
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+#ifndef TEST_LIBPLATFORM_H_
+#define TEST_LIBPLATFORM_H_
+
 #include "v8.h"
 
 #include "cctest.h"
-#include "cpu.h"
 
 using namespace v8::internal;
 
+class TestTask : public v8::Task {
+ public:
+  explicit TestTask(bool expected_to_run)
+      : expected_to_run_(expected_to_run), executed_(false) {}
+  TestTask() : expected_to_run_(false), executed_(false) {}
+  virtual ~TestTask() {
+    CHECK_EQ(expected_to_run_, executed_);
+  }
 
-TEST(FeatureImplications) {
-  // Test for features implied by other features.
-  CPU cpu;
+  // v8::Task implementation.
+  virtual void Run() V8_OVERRIDE { executed_ = true; }
 
-  // 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());
+ private:
+  bool expected_to_run_;
+  bool executed_;
 
-  // arm features
-  CHECK(!cpu.has_vfp3_d32() || cpu.has_vfp3());
-}
+  DISALLOW_COPY_AND_ASSIGN(TestTask);
+};
 
 
-TEST(NumberOfProcessorsOnline) {
-  CHECK_GT(CPU::NumberOfProcessorsOnline(), 0);
-}
+class TestThread : public Thread {
+ public:
+  explicit TestThread(v8::Task* task)
+      : Thread("libplatform TestThread"), semaphore_(0), task_(task) {}
+  virtual ~TestThread() {}
+
+  void Signal() { semaphore_.Signal(); }
+
+  // Thread implementation.
+  virtual void Run() V8_OVERRIDE {
+    semaphore_.Wait();
+    if (task_) {
+      task_->Run();
+      delete task_;
+    }
+  }
+
+ private:
+  Semaphore semaphore_;
+  v8::Task* task_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestThread);
+};
+
+#endif  // TEST_LIBPLATFORM_H_