Disallow UI/IO thread blocking on any other thread.

base/threading/simple_thread.cc

 // Copyright (c) 2010 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/threading/simple_thread.h"
 
 #include "base/logging.h"
 #include "base/threading/platform_thread.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/string_number_conversions.h"
 
 namespace base {
 
 SimpleThread::SimpleThread(const std::string& name_prefix)
     : name_prefix_(name_prefix), name_(name_prefix),
       thread_(), event_(true, false), tid_(0), joined_(false) {
 }
 
 SimpleThread::SimpleThread(const std::string& name_prefix,
                            const Options& options)
     : name_prefix_(name_prefix), name_(name_prefix), options_(options),
       thread_(), event_(true, false), tid_(0), joined_(false) {
 }
 
 SimpleThread::~SimpleThread() {
   DCHECK(HasBeenStarted()) << "SimpleThread was never started.";
   DCHECK(HasBeenJoined()) << "SimpleThread destroyed without being Join()ed.";
 }
 
 void SimpleThread::Start() {
   DCHECK(!HasBeenStarted()) << "Tried to Start a thread multiple times.";
   bool success = PlatformThread::Create(options_.stack_size(), this, &thread_);
   DCHECK(success);
+  base::ThreadRestrictions::ScopedAllowWait allow_wait;
   event_.Wait();  // Wait for the thread to complete initialization.
 }
 
 void SimpleThread::Join() {
   DCHECK(HasBeenStarted()) << "Tried to Join a never-started thread.";
   DCHECK(!HasBeenJoined()) << "Tried to Join a thread multiple times.";
   PlatformThread::Join(thread_);
   joined_ = true;
 }
 
+bool SimpleThread::HasBeenStarted() {
+  base::ThreadRestrictions::ScopedAllowWait allow_wait;
+  return event_.IsSignaled();
+}
+
 void SimpleThread::ThreadMain() {
   tid_ = PlatformThread::CurrentId();
   // Construct our full name of the form "name_prefix_/TID".
   name_.push_back('/');
   name_.append(IntToString(tid_));
   PlatformThread::SetName(name_.c_str());
 
   // We've initialized our new thread, signal that we're done to Start().
   event_.Signal();
 
@@ skipping 90 matching lines @@
 
     // A NULL delegate pointer signals us to quit.
     if (!work)
       break;
 
     work->Run();
   }
 }
 
 }  // namespace base