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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// Copyright (c) 2006-2008 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 BASE_PROCESS_H_
#define BASE_PROCESS_H_
#include "base/basictypes.h"
#include <sys/types.h>
#ifdef OS_WIN
#include <windows.h>
#endif
namespace base {
// ProcessHandle is a platform specific type which represents the underlying OS
// handle to a process.
// ProcessId is a number which identifies the process in the OS.
#if defined(OS_WIN)
typedef HANDLE ProcessHandle;
typedef DWORD ProcessId;
#elif defined(OS_POSIX)
// On POSIX, our ProcessHandle will just be the PID.
typedef pid_t ProcessHandle;
typedef pid_t ProcessId;
#endif
class Process {
public:
Process() : process_(0), last_working_set_size_(0) {}
explicit Process(ProcessHandle aHandle) :
process_(aHandle), last_working_set_size_(0) {}
// A handle to the current process.
static Process Current();
// Get/Set the handle for this process. The handle will be 0 if the process
// is no longer running.
ProcessHandle handle() const { return process_; }
void set_handle(ProcessHandle aHandle) { process_ = aHandle; }
// Get the PID for this process.
ProcessId pid() const;
// Is the this process the current process.
bool is_current() const;
// Close the process handle. This will not terminate the process.
void Close();
// Terminates the process with extreme prejudice. The given result code will
// be the exit code of the process. If the process has already exited, this
// will do nothing.
void Terminate(int result_code);
// A process is backgrounded when it's priority is lower than normal.
// Return true if this process is backgrounded, false otherwise.
bool IsProcessBackgrounded() const;
// Set a prcess as backgrounded. If value is true, the priority
// of the process will be lowered. If value is false, the priority
// of the process will be made "normal" - equivalent to default
// process priority.
// Returns true if the priority was changed, false otherwise.
bool SetProcessBackgrounded(bool value);
// Releases as much of the working set back to the OS as possible.
// Returns true if successful, false otherwise.
bool EmptyWorkingSet();
private:
ProcessHandle process_;
size_t last_working_set_size_;
};
} // namespace base
#endif // BASE_PROCESS_H_
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