Create a simple abstraction to a native OS thread, mostly useful for unittesting when you don't want a message loop.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@1217 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 82 insertions, 0 deletions

diff --git a/base/simple_thread.cc b/base/simple_thread.cc
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "base/simple_thread.h"
+
+#include "base/call_wrapper.h"
+#include "base/waitable_event.h"
+#include "base/logging.h"
+#include "base/platform_thread.h"
+#include "base/string_util.h"
+
+namespace base {
+
+void SimpleThread::Start() {
+  DCHECK(!HasBeenStarted()) << "Tried to Start a thread multiple times.";
+  bool success = PlatformThread::Create(options_.stack_size(), this, &thread_);
+  CHECK(success);
+  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;
+}
+
+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(tid_, name_.c_str());
+
+  // We've initialized our new thread, signal that we're done to Start().
+  event_.Signal();
+
+  Run();
+}
+
+SimpleThread::~SimpleThread() {
+  DCHECK(HasBeenStarted()) << "SimpleThread was never started.";
+  DCHECK(HasBeenJoined()) << "SimpleThread destroyed without being Join()ed.";
+}
+
+void CallWrapperSimpleThread::Run() {
+  DCHECK(wrapper_) << "Tried to call Run without a wrapper (called twice?)";
+  wrapper_->Run();
+  wrapper_ = NULL;
+}
+
+CallWrapperSimpleThread::~CallWrapperSimpleThread() {
+  DCHECK(!wrapper_) << "CallWrapper was never released.";
+}
+
+}  // namespace base