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// 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 "chrome/common/process_watcher.h"
#include "base/scoped_ptr.h"
#include "base/env_var.h"
#include "base/message_loop.h"
#include "base/object_watcher.h"
#include "chrome/common/env_vars.h"
#include "chrome/common/result_codes.h"
// Maximum amount of time (in milliseconds) to wait for the process to exit.
static const int kWaitInterval = 2000;
namespace {
class TimerExpiredTask : public Task, public base::ObjectWatcher::Delegate {
public:
explicit TimerExpiredTask(base::ProcessHandle process) : process_(process) {
watcher_.StartWatching(process_, this);
}
virtual ~TimerExpiredTask() {
if (process_) {
KillProcess();
DCHECK(!process_) << "Make sure to close the handle.";
}
}
// Task ---------------------------------------------------------------------
virtual void Run() {
if (process_)
KillProcess();
}
// MessageLoop::Watcher -----------------------------------------------------
virtual void OnObjectSignaled(HANDLE object) {
// When we're called from KillProcess, the ObjectWatcher may still be
// watching. the process handle, so make sure it has stopped.
watcher_.StopWatching();
CloseHandle(process_);
process_ = NULL;
}
private:
void KillProcess() {
scoped_ptr<base::EnvVarGetter> env(base::EnvVarGetter::Create());
if (env->HasEnv(env_vars::kHeadless)) {
// If running the distributed tests, give the renderer a little time
// to figure out that the channel is shutdown and unwind.
if (WaitForSingleObject(process_, kWaitInterval) == WAIT_OBJECT_0) {
OnObjectSignaled(process_);
return;
}
}
// OK, time to get frisky. We don't actually care when the process
// terminates. We just care that it eventually terminates, and that's what
// TerminateProcess should do for us. Don't check for the result code since
// it fails quite often. This should be investigated eventually.
base::KillProcess(process_, ResultCodes::HUNG, false);
// Now, just cleanup as if the process exited normally.
OnObjectSignaled(process_);
}
// The process that we are watching.
base::ProcessHandle process_;
base::ObjectWatcher watcher_;
DISALLOW_COPY_AND_ASSIGN(TimerExpiredTask);
};
} // namespace
// static
void ProcessWatcher::EnsureProcessTerminated(base::ProcessHandle process) {
DCHECK(process != GetCurrentProcess());
// If already signaled, then we are done!
if (WaitForSingleObject(process, 0) == WAIT_OBJECT_0) {
CloseHandle(process);
return;
}
MessageLoop::current()->PostDelayedTask(FROM_HERE,
new TimerExpiredTask(process),
kWaitInterval);
}
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