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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 <windows.h>
#include "chrome/common/child_process.h"
#include "base/atomic_ref_count.h"
#include "base/basictypes.h"
ChildProcess* ChildProcess::child_process_;
MessageLoop* ChildProcess::main_thread_loop_;
static base::AtomicRefCount ref_count;
HANDLE ChildProcess::shutdown_event_;
ChildProcess::ChildProcess() {
DCHECK(!child_process_);
}
ChildProcess::~ChildProcess() {
DCHECK(child_process_ == this);
}
// Called on any thread
void ChildProcess::AddRefProcess() {
base::AtomicRefCountInc(&ref_count);
}
// Called on any thread
void ChildProcess::ReleaseProcess() {
DCHECK(!base::AtomicRefCountIsZero(&ref_count));
DCHECK(child_process_);
if (!base::AtomicRefCountDec(&ref_count))
child_process_->OnFinalRelease();
}
// Called on any thread
// static
bool ChildProcess::ProcessRefCountIsZero() {
return base::AtomicRefCountIsZero(&ref_count);
}
void ChildProcess::OnFinalRelease() {
DCHECK(main_thread_loop_);
main_thread_loop_->PostTask(FROM_HERE, new MessageLoop::QuitTask());
}
HANDLE ChildProcess::GetShutDownEvent() {
return shutdown_event_;
}
// On error, it is OK to leave the global pointers, as long as the only
// non-NULL pointers are valid. GlobalCleanup will always get called, which
// will delete any non-NULL services.
bool ChildProcess::GlobalInit(const std::wstring &channel_name,
ChildProcessFactoryInterface *factory) {
// OK to be called multiple times.
if (main_thread_loop_)
return true;
if (channel_name.empty()) {
NOTREACHED() << "Unable to get the channel name";
return false;
}
// Remember the current message loop, so we can communicate with this thread
// again when we need to shutdown (see ReleaseProcess).
main_thread_loop_ = MessageLoop::current();
// An event that will be signalled when we shutdown.
shutdown_event_ = CreateEvent(NULL, TRUE, FALSE, NULL);
child_process_ = factory->Create(channel_name);
return true;
}
void ChildProcess::GlobalCleanup() {
// Signal this event before destroying the child process. That way all
// background threads.
// For example, in the renderer the RenderThread instances will be able to
// notice shutdown before the render process begins waiting for them to exit.
SetEvent(shutdown_event_);
// Destroy the child process first to force all background threads to
// terminate before we bring down other resources. (We null pointers
// just in case.)
child_process_->Cleanup();
delete child_process_;
child_process_ = NULL;
main_thread_loop_ = NULL;
CloseHandle(shutdown_event_);
shutdown_event_ = NULL;
}
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