Version 1.4.1

dart/runtime/platform/thread_win.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 "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "platform/thread.h"
 
 #include <process.h>  // NOLINT
@@ skipping 15 matching lines @@
   uword parameter_;
 
   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 unsigned int __stdcall ThreadEntry(void* data_ptr) {
-  ThreadStartData* data =  reinterpret_cast<ThreadStartData*>(data_ptr);
+  ThreadStartData* data = reinterpret_cast<ThreadStartData*>(data_ptr);
 
   Thread::ThreadStartFunction function = data->function();
   uword parameter = data->parameter();
   delete data;
 
-  ASSERT(ThreadInlineImpl::thread_id_key != Thread::kUnsetThreadLocalKey);
-
-  ThreadId thread_id = ThreadInlineImpl::CreateThreadId();
-  // Set thread ID in TLS.
-  Thread::SetThreadLocal(ThreadInlineImpl::thread_id_key,
-                         reinterpret_cast<DWORD>(thread_id));
   MonitorData::GetMonitorWaitDataForThread();
 
   // Call the supplied thread start function handing it its parameters.
   function(parameter);
 
   // Clean up the monitor wait data for this thread.
   MonitorWaitData::ThreadExit();
 
-  // Clear thread ID in TLS.
-  Thread::SetThreadLocal(ThreadInlineImpl::thread_id_key, NULL);
-  ThreadInlineImpl::DestroyThreadId(thread_id);
-
   return 0;
 }
 
 
 int Thread::Start(ThreadStartFunction function, uword parameter) {
   ThreadStartData* start_data = new ThreadStartData(function, parameter);
   uint32_t tid;
   uintptr_t thread = _beginthreadex(NULL, Thread::GetMaxStackSize(),
                                     ThreadEntry, start_data, 0, &tid);
   if (thread == -1L || thread == 0) {
 #ifdef DEBUG
     fprintf(stderr, "_beginthreadex error: %d (%s)\n", errno, strerror(errno));
 #endif
     return errno;
   }
 
+  // Close the handle, so we don't leak the thread object.
+  CloseHandle(reinterpret_cast<HANDLE>(thread));
+
   return 0;
 }
 
-
-ThreadId ThreadInlineImpl::CreateThreadId() {
-  // Create an ID for this thread that can be shared with other threads.
-  HANDLE thread_id = OpenThread(THREAD_GET_CONTEXT |
-                                THREAD_SUSPEND_RESUME |
-                                THREAD_QUERY_INFORMATION,
-                                false,
-                                GetCurrentThreadId());
-  ASSERT(thread_id != NULL);
-  return thread_id;
-}
-
-
-void ThreadInlineImpl::DestroyThreadId(ThreadId thread_id) {
-  ASSERT(thread_id != NULL);
-  // Destroy thread ID.
-  CloseHandle(thread_id);
-}
-
-
-ThreadLocalKey ThreadInlineImpl::thread_id_key = Thread::kUnsetThreadLocalKey;
-
 ThreadLocalKey Thread::kUnsetThreadLocalKey = TLS_OUT_OF_INDEXES;
-ThreadId Thread::kInvalidThreadId =
-    reinterpret_cast<ThreadId>(INVALID_HANDLE_VALUE);
+ThreadId Thread::kInvalidThreadId = 0;
 
 ThreadLocalKey Thread::CreateThreadLocal() {
   ThreadLocalKey key = TlsAlloc();
   if (key == kUnsetThreadLocalKey) {
     FATAL1("TlsAlloc failed %d", GetLastError());
   }
   return key;
 }
 
 
 void Thread::DeleteThreadLocal(ThreadLocalKey key) {
   ASSERT(key != kUnsetThreadLocalKey);
   BOOL result = TlsFree(key);
   if (!result) {
     FATAL1("TlsFree failed %d", GetLastError());
   }
 }
 
 
 intptr_t Thread::GetMaxStackSize() {
   const int kStackSize = (128 * kWordSize * KB);
   return kStackSize;
 }
 
 
 ThreadId Thread::GetCurrentThreadId() {
-  ThreadId id = reinterpret_cast<ThreadId>(
-      Thread::GetThreadLocal(ThreadInlineImpl::thread_id_key));
-  ASSERT(id != NULL);
-  return id;
+  return ::GetCurrentThreadId();
+}
+
+
+bool Thread::Join(ThreadId id) {
+  HANDLE handle = OpenThread(SYNCHRONIZE, false, id);
+  if (handle == INVALID_HANDLE_VALUE) {
+    return false;
+  }
+  DWORD res = WaitForSingleObject(handle, INFINITE);
+  CloseHandle(handle);
+  return res == WAIT_OBJECT_0;
 }
 
 
 intptr_t Thread::ThreadIdToIntPtr(ThreadId id) {
-  ASSERT(sizeof(id) == sizeof(intptr_t));
-  return reinterpret_cast<intptr_t>(id);
+  ASSERT(sizeof(id) <= sizeof(intptr_t));
+  return static_cast<intptr_t>(id);
 }
 
 
 bool Thread::Compare(ThreadId a, ThreadId b) {
   return a == b;
 }
 
 
 void Thread::GetThreadCpuUsage(ThreadId thread_id, int64_t* cpu_usage) {
   static const int64_t kTimeEpoc = 116444736000000000LL;
   static const int64_t kTimeScaler = 10;  // 100 ns to us.
   // Although win32 uses 64-bit integers for representing timestamps,
   // these are packed into a FILETIME structure. The FILETIME
   // structure is just a struct representing a 64-bit integer. The
   // TimeStamp union allows access to both a FILETIME and an integer
   // representation of the timestamp. The Windows timestamp is in
   // 100-nanosecond intervals since January 1, 1601.
   union TimeStamp {
     FILETIME ft_;
     int64_t t_;
   };
   ASSERT(cpu_usage != NULL);
   TimeStamp created;
   TimeStamp exited;
   TimeStamp kernel;
   TimeStamp user;
-  BOOL result = GetThreadTimes(thread_id,
+  HANDLE handle = OpenThread(THREAD_QUERY_INFORMATION, false, thread_id);
+  BOOL result = GetThreadTimes(handle,
                                &created.ft_,
                                &exited.ft_,
                                &kernel.ft_,
                                &user.ft_);
+  CloseHandle(handle);
   if (!result) {
     FATAL1("GetThreadCpuUsage failed %d\n", GetLastError());
   }
   *cpu_usage = (user.t_ - kTimeEpoc) / kTimeScaler;
 }
 
 
 void Thread::SetThreadLocal(ThreadLocalKey key, uword value) {
   ASSERT(key != kUnsetThreadLocalKey);
   BOOL result = TlsSetValue(key, reinterpret_cast<void*>(value));
@@ skipping 269 matching lines @@
   // timeout before we signal it, that object will get an extra
   // signal. This will be treated as a spurious wake-up and is OK
   // since all uses of monitors should recheck the condition after a
   // Wait.
   data_.SignalAndRemoveAllWaiters();
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)