Disallow UI/IO thread blocking on any other thread.

base/synchronization/waitable_event_win.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/synchronization/waitable_event.h"
 
 #include <math.h>
 #include <windows.h>
 
 #include "base/logging.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/time.h"
 
 namespace base {
 
 WaitableEvent::WaitableEvent(bool manual_reset, bool signaled)
     : handle_(CreateEvent(NULL, manual_reset, signaled, NULL)) {
   // We're probably going to crash anyways if this is ever NULL, so we might as
   // well make our stack reports more informative by crashing here.
   CHECK(handle_);
 }
@@ skipping 19 matching lines @@
 
 void WaitableEvent::Signal() {
   SetEvent(handle_);
 }
 
 bool WaitableEvent::IsSignaled() {
   return TimedWait(TimeDelta::FromMilliseconds(0));
 }
 
 void WaitableEvent::Wait() {
+  base::ThreadRestrictions::AssertWaitAllowed();
   DWORD result = WaitForSingleObject(handle_, INFINITE);
   // It is most unexpected that this should ever fail.  Help consumers learn
   // about it if it should ever fail.
   DCHECK_EQ(WAIT_OBJECT_0, result) << "WaitForSingleObject failed";
 }
 
 bool WaitableEvent::TimedWait(const TimeDelta& max_time) {
+  base::ThreadRestrictions::AssertWaitAllowed();
   DCHECK(max_time >= TimeDelta::FromMicroseconds(0));
   // Be careful here.  TimeDelta has a precision of microseconds, but this API
   // is in milliseconds.  If there are 5.5ms left, should the delay be 5 or 6?
   // It should be 6 to avoid returning too early.
   double timeout = ceil(max_time.InMillisecondsF());
   DWORD result = WaitForSingleObject(handle_, static_cast<DWORD>(timeout));
   switch (result) {
     case WAIT_OBJECT_0:
       return true;
     case WAIT_TIMEOUT:
       return false;
   }
   // It is most unexpected that this should ever fail.  Help consumers learn
   // about it if it should ever fail.
   NOTREACHED() << "WaitForSingleObject failed";
   return false;
 }
 
 // static
 size_t WaitableEvent::WaitMany(WaitableEvent** events, size_t count) {
+  base::ThreadRestrictions::AssertWaitAllowed();
   HANDLE handles[MAXIMUM_WAIT_OBJECTS];
   CHECK_LE(count, MAXIMUM_WAIT_OBJECTS)
       << "Can only wait on " << MAXIMUM_WAIT_OBJECTS << " with WaitMany";
 
   for (size_t i = 0; i < count; ++i)
     handles[i] = events[i]->handle();
 
   // The cast is safe because count is small - see the CHECK above.
   DWORD result =
       WaitForMultipleObjects(static_cast<DWORD>(count),
                              handles,
                              FALSE,      // don't wait for all the objects
                              INFINITE);  // no timeout
   if (result >= WAIT_OBJECT_0 + count) {
     NOTREACHED() << "WaitForMultipleObjects failed: " << GetLastError();
     return 0;
   }
 
   return result - WAIT_OBJECT_0;
 }
 
 }  // namespace base