Change the thread interface in runtime/platform and use it starting all threads

runtime/platform/thread_linux.cc

Index: runtime/platform/thread_linux.cc
diff --git a/runtime/platform/thread_linux.cc b/runtime/platform/thread_linux.cc
index 338c4c8d1cab8cf9ebb01ae465117f5e20c6b779..f8c8cbfdfacbe424a66fe474e5823fcf6acd3400 100644
--- a/runtime/platform/thread_linux.cc
+++ b/runtime/platform/thread_linux.cc
@@ -11,6 +11,8 @@
 
 namespace dart {
 
+const ThreadHandle Thread::kInvalidThreadHandle = 0;
+
 #define VALIDATE_PTHREAD_RESULT(result) \
   if (result != 0) { \
     FATAL2("pthread error: %d (%s)", result, strerror(result)); \
@@ -32,48 +34,10 @@ static void ComputeTimeSpec(struct timespec* ts, int64_t millis) {
 }
 
 
-class ThreadStartData {
- public:
-  ThreadStartData(Thread::ThreadStartFunction function,
-                  uword parameter,
-                  Thread* thread)
-      : function_(function), parameter_(parameter), thread_(thread) {}
-
-  Thread::ThreadStartFunction function() const { return function_; }
-  uword parameter() const { return parameter_; }
-  Thread* thread() const { return thread_; }
-
- private:
-  Thread::ThreadStartFunction function_;
-  uword parameter_;
-  Thread* thread_;
-
-  DISALLOW_COPY_AND_ASSIGN(ThreadStartData);
-};
-
-
-// Dispatch to the thread start function provided by the caller. This trampoline
-// is used to ensure that the thread is properly destroyed if the thread just
-// exits.
-static void* ThreadStart(void* data_ptr) {

[Ivan Posva, 2012/01/20 16:45:55]

In the past I have found this extra trampoline helpful to provide a hook for
extra logging, both when starting or exiting a thread.

[Søren Gjesse, 2012/01/23 13:14:58]

OK, I added it back. It was also still there on Windows to be able to close the
thread handle.

-  ThreadStartData* data = reinterpret_cast<ThreadStartData*>(data_ptr);
-
-  Thread::ThreadStartFunction function = data->function();
-  uword parameter = data->parameter();
-  Thread* thread = data->thread();
-  delete data;
-
-  // Call the supplied thread start function handing it its parameters.
-  function(parameter);
+typedef void* (*PThreadStartFunction)(void* args);
 
-  // When the function returns here, make sure that the thread is deleted.
-  delete thread;
 
-  return NULL;
-}
-
-
-Thread::Thread(ThreadStartFunction function, uword parameter) {
+ThreadHandle Thread::Start(ThreadStartFunction function, uword parameter) {
   pthread_attr_t attr;
   int result = pthread_attr_init(&attr);
   VALIDATE_PTHREAD_RESULT(result);
@@ -84,23 +48,23 @@ Thread::Thread(ThreadStartFunction function, uword parameter) {
   result = pthread_attr_setstacksize(&attr, 1024 * KB);
   VALIDATE_PTHREAD_RESULT(result);
 
-  ThreadStartData* data = new ThreadStartData(function, parameter, this);
-
   pthread_t tid;
   result = pthread_create(&tid,
                           &attr,
-                          ThreadStart,
-                          data);
+                          reinterpret_cast<PThreadStartFunction>(function),
+                          reinterpret_cast<void*>(parameter));
   VALIDATE_PTHREAD_RESULT(result);
 
-  data_.tid_ = tid;
-
   result = pthread_attr_destroy(&attr);
   VALIDATE_PTHREAD_RESULT(result);
+
+  return tid;
 }
 
 
-Thread::~Thread() {
+void Thread::Join(ThreadHandle thread) {
+  int result = pthread_join(thread, NULL);
+  VALIDATE_PTHREAD_RESULT(result);
 }