ipc/chromium/src/base/simple_thread.cc@6474c204b198 (annotated)
ipc/chromium/src/base/simple_thread.cc
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. |
| michael@0 | 2 | // Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 3 | // found in the LICENSE file. |
| michael@0 | 4 | |
| michael@0 | 5 | #include "base/simple_thread.h" |
| michael@0 | 6 | |
| michael@0 | 7 | #include "base/waitable_event.h" |
| michael@0 | 8 | #include "base/logging.h" |
| michael@0 | 9 | #include "base/platform_thread.h" |
| michael@0 | 10 | #include "base/string_util.h" |
| michael@0 | 11 | |
| michael@0 | 12 | namespace base { |
| michael@0 | 13 | |
| michael@0 | 14 | void SimpleThread::Start() { |
| michael@0 | 15 | DCHECK(!HasBeenStarted()) << "Tried to Start a thread multiple times."; |
| michael@0 | 16 | bool success = PlatformThread::Create(options_.stack_size(), this, &thread_); |
| michael@0 | 17 | CHECK(success); |
| michael@0 | 18 | event_.Wait(); // Wait for the thread to complete initialization. |
| michael@0 | 19 | } |
| michael@0 | 20 | |
| michael@0 | 21 | void SimpleThread::Join() { |
| michael@0 | 22 | DCHECK(HasBeenStarted()) << "Tried to Join a never-started thread."; |
| michael@0 | 23 | DCHECK(!HasBeenJoined()) << "Tried to Join a thread multiple times."; |
| michael@0 | 24 | PlatformThread::Join(thread_); |
| michael@0 | 25 | joined_ = true; |
| michael@0 | 26 | } |
| michael@0 | 27 | |
| michael@0 | 28 | void SimpleThread::ThreadMain() { |
| michael@0 | 29 | tid_ = PlatformThread::CurrentId(); |
| michael@0 | 30 | // Construct our full name of the form "name_prefix_/TID". |
| michael@0 | 31 | name_.push_back('/'); |
| michael@0 | 32 | name_.append(IntToString(tid_)); |
| michael@0 | 33 | PlatformThread::SetName(name_.c_str()); |
| michael@0 | 34 | |
| michael@0 | 35 | // We've initialized our new thread, signal that we're done to Start(). |
| michael@0 | 36 | event_.Signal(); |
| michael@0 | 37 | |
| michael@0 | 38 | Run(); |
| michael@0 | 39 | } |
| michael@0 | 40 | |
| michael@0 | 41 | SimpleThread::~SimpleThread() { |
| michael@0 | 42 | DCHECK(HasBeenStarted()) << "SimpleThread was never started."; |
| michael@0 | 43 | DCHECK(HasBeenJoined()) << "SimpleThread destroyed without being Join()ed."; |
| michael@0 | 44 | } |
| michael@0 | 45 | |
| michael@0 | 46 | void DelegateSimpleThread::Run() { |
| michael@0 | 47 | DCHECK(delegate_) << "Tried to call Run without a delegate (called twice?)"; |
| michael@0 | 48 | delegate_->Run(); |
| michael@0 | 49 | delegate_ = NULL; |
| michael@0 | 50 | } |
| michael@0 | 51 | |
| michael@0 | 52 | DelegateSimpleThreadPool::~DelegateSimpleThreadPool() { |
| michael@0 | 53 | DCHECK(threads_.empty()); |
| michael@0 | 54 | DCHECK(delegates_.empty()); |
| michael@0 | 55 | DCHECK(!dry_.IsSignaled()); |
| michael@0 | 56 | } |
| michael@0 | 57 | |
| michael@0 | 58 | void DelegateSimpleThreadPool::Start() { |
| michael@0 | 59 | DCHECK(threads_.empty()) << "Start() called with outstanding threads."; |
| michael@0 | 60 | for (int i = 0; i < num_threads_; ++i) { |
| michael@0 | 61 | DelegateSimpleThread* thread = new DelegateSimpleThread(this, name_prefix_); |
| michael@0 | 62 | thread->Start(); |
| michael@0 | 63 | threads_.push_back(thread); |
| michael@0 | 64 | } |
| michael@0 | 65 | } |
| michael@0 | 66 | |
| michael@0 | 67 | void DelegateSimpleThreadPool::JoinAll() { |
| michael@0 | 68 | DCHECK(!threads_.empty()) << "JoinAll() called with no outstanding threads."; |
| michael@0 | 69 | |
| michael@0 | 70 | // Tell all our threads to quit their worker loop. |
| michael@0 | 71 | AddWork(NULL, num_threads_); |
| michael@0 | 72 | |
| michael@0 | 73 | // Join and destroy all the worker threads. |
| michael@0 | 74 | for (int i = 0; i < num_threads_; ++i) { |
| michael@0 | 75 | threads_[i]->Join(); |
| michael@0 | 76 | delete threads_[i]; |
| michael@0 | 77 | } |
| michael@0 | 78 | threads_.clear(); |
| michael@0 | 79 | DCHECK(delegates_.empty()); |
| michael@0 | 80 | } |
| michael@0 | 81 | |
| michael@0 | 82 | void DelegateSimpleThreadPool::AddWork(Delegate* delegate, int repeat_count) { |
| michael@0 | 83 | AutoLock locked(lock_); |
| michael@0 | 84 | for (int i = 0; i < repeat_count; ++i) |
| michael@0 | 85 | delegates_.push(delegate); |
| michael@0 | 86 | // If we were empty, signal that we have work now. |
| michael@0 | 87 | if (!dry_.IsSignaled()) |
| michael@0 | 88 | dry_.Signal(); |
| michael@0 | 89 | } |
| michael@0 | 90 | |
| michael@0 | 91 | void DelegateSimpleThreadPool::Run() { |
| michael@0 | 92 | Delegate* work; |
| michael@0 | 93 | |
| michael@0 | 94 | while (true) { |
| michael@0 | 95 | dry_.Wait(); |
| michael@0 | 96 | { |
| michael@0 | 97 | AutoLock locked(lock_); |
| michael@0 | 98 | if (!dry_.IsSignaled()) |
| michael@0 | 99 | continue; |
| michael@0 | 100 | |
| michael@0 | 101 | DCHECK(!delegates_.empty()); |
| michael@0 | 102 | work = delegates_.front(); |
| michael@0 | 103 | delegates_.pop(); |
| michael@0 | 104 | |
| michael@0 | 105 | // Signal to any other threads that we're currently out of work. |
| michael@0 | 106 | if (delegates_.empty()) |
| michael@0 | 107 | dry_.Reset(); |
| michael@0 | 108 | } |
| michael@0 | 109 | |
| michael@0 | 110 | // A NULL delegate pointer signals us to quit. |
| michael@0 | 111 | if (!work) |
| michael@0 | 112 | break; |
| michael@0 | 113 | |
| michael@0 | 114 | work->Run(); |
| michael@0 | 115 | } |
| michael@0 | 116 | } |
| michael@0 | 117 | |
| michael@0 | 118 | } // namespace base |
