Automatic thread cleanup on non-Windows platforms.

runtime/vm/thread_pool.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/thread_pool.h"
 
 #include "vm/flags.h"
 #include "vm/lockers.h"
 
 namespace dart {
@@ skipping 256 matching lines @@
 void ThreadPool::Worker::Loop() {
   MonitorLocker ml(&monitor_);
   int64_t idle_start;
   while (true) {
     ASSERT(task_ != NULL);
     Task* task = task_;
     task_ = NULL;
 
     // Release monitor while handling the task.
     monitor_.Exit();
-    Thread::EnsureInit();
     task->Run();
     ASSERT(Isolate::Current() == NULL);
-    // Prevent unintended sharing of state between tasks.
-    Thread::CleanUp();
     delete task;
     monitor_.Enter();
 
     ASSERT(task_ == NULL);
     if (IsDone()) {
       return;
     }
     ASSERT(pool_ != NULL);
     pool_->SetIdle(this);
     idle_start = OS::GetCurrentTimeMillis();
@@ skipping 19 matching lines @@
 
 void ThreadPool::Worker::Shutdown() {
   MonitorLocker ml(&monitor_);
   pool_ = NULL;  // Fail fast if someone tries to access pool_.
   ml.Notify();
 }
 
 
 // static
 void ThreadPool::Worker::Main(uword args) {
+  Thread::EnsureInit();
   Worker* worker = reinterpret_cast<Worker*>(args);
   worker->Loop();
 
   // It should be okay to access these unlocked here in this assert.
   ASSERT(!worker->owned_ &&
          worker->all_next_ == NULL &&
          worker->idle_next_ == NULL);
 
   // The exit monitor is only used during testing.
   if (ThreadPool::exit_monitor_) {
     MonitorLocker ml(ThreadPool::exit_monitor_);
     (*ThreadPool::exit_count_)++;
     ml.Notify();
   }
   delete worker;
+#if defined(TARGET_OS_WINDOWS)
+  Thread::CleanUp();
+#endif
 }
 
 }  // namespace dart