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// 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"
#ifdef OS_WIN
#include <windows.h>
#endif
// ProcessHandle is a platform specific type which represents the underlying OS
// handle to a process.
#if defined(OS_WIN)
typedef HANDLE ProcessHandle;
#elif defined(OS_POSIX)
// On POSIX, our ProcessHandle will just be the PID.
typedef int ProcessHandle;
#endif
// A Process
// TODO(mbelshe): Replace existing code which uses the ProcessHandle w/ the
// Process object where relevant.
class Process {
public:
Process() : process_(0), last_working_set_size_(0) {}
explicit Process(ProcessHandle handle) :
process_(handle), last_working_set_size_(0) {}
// A handle to the current process.
static Process Current();
// Get/Set the handle for this process.
ProcessHandle handle() { return process_; }
void set_handle(ProcessHandle handle) { process_ = handle; }
// Get the PID for this process.
int32 pid() const;
// Is the this process the current process.
bool is_current() const;
// Close the Process Handle.
void Close() {
#ifdef OS_WIN
CloseHandle(process_);
#endif
process_ = 0;
}
// A process is backgrounded when it's priority is lower than normal.
// Return true if this process is backgrounded, false otherwise.
bool IsProcessBackgrounded();
// 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);
// Reduces the working set of memory used by the process.
// The algorithm used by this function is intentionally vague. Repeated calls
// to this function consider the process' previous required Working Set sizes
// to determine a reasonable reduction. This helps give memory back to the OS
// in increments without over releasing memory.
// When the WorkingSet is reduced, it is permanent, until the caller calls
// UnReduceWorkingSet.
// Returns true if successful, false otherwise.
bool ReduceWorkingSet();
// Undoes the effects of prior calls to ReduceWorkingSet().
// Returns true if successful, false otherwise.
bool UnReduceWorkingSet();
// 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_;
};
#endif // BASE_PROCESS_H__
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