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// Copyright (c) 2011 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.
#ifndef CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_H_
#define CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_H_
#pragma once
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/process_util.h"
#include "content/common/content_export.h"
class CommandLine;
// Launches a process asynchronously and notifies the client of the process
// handle when it's available. It's used to avoid blocking the calling thread
// on the OS since often it can take > 100 ms to create the process.
class CONTENT_EXPORT ChildProcessLauncher {
public:
class CONTENT_EXPORT Client {
public:
// Will be called on the thread that the ChildProcessLauncher was
// constructed on.
virtual void OnProcessLaunched() = 0;
protected:
virtual ~Client() {}
};
// Launches the process asynchronously, calling the client when the result is
// ready. Deleting this object before the process is created is safe, since
// the callback won't be called. If the process is still running by the time
// this object destructs, it will be terminated.
// Takes ownership of cmd_line.
ChildProcessLauncher(
#if defined(OS_WIN)
const FilePath& exposed_dir,
#elif defined(OS_POSIX)
bool use_zygote,
const base::environment_vector& environ,
int ipcfd,
#endif
CommandLine* cmd_line,
Client* client);
~ChildProcessLauncher();
// True if the process is being launched and so the handle isn't available.
bool IsStarting();
// Getter for the process handle. Only call after the process has started.
base::ProcessHandle GetHandle();
// Call this when the child process exits to know what happened to
// it. |exit_code| is the exit code of the process if it exited
// (e.g. status from waitpid if on posix, from GetExitCodeProcess on
// Windows). |exit_code| may be NULL.
base::TerminationStatus GetChildTerminationStatus(int* exit_code);
// Changes whether the process runs in the background or not. Only call
// this after the process has started.
void SetProcessBackgrounded(bool background);
// Controls whether the child process should be terminated on browser
// shutdown.
void SetTerminateChildOnShutdown(bool terminate_on_shutdown);
private:
class Context;
scoped_refptr<Context> context_;
DISALLOW_COPY_AND_ASSIGN(ChildProcessLauncher);
};
#endif // CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_H_
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