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// Copyright 2013 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Based on
// https://cs.chromium.org/chromium/src/v8/src/base/platform/semaphore.h
#ifndef UTIL_SEMAPHORE_H_
#define UTIL_SEMAPHORE_H_
#include "base/macros.h"
#include "util/build_config.h"
#if defined(OS_WIN)
#include <windows.h>
#elif defined(OS_MACOSX)
#include <mach/mach.h>
#elif defined(OS_LINUX) || defined(OS_AIX)
#include <semaphore.h>
#else
#error Port.
#endif
class Semaphore {
public:
explicit Semaphore(int count);
~Semaphore();
// Increments the semaphore counter.
void Signal();
// Decrements the semaphore counter if it is positive, or blocks until it
// becomes positive and then decrements the counter.
void Wait();
#if defined(OS_MACOSX)
typedef semaphore_t NativeHandle;
#elif defined(OS_LINUX) || defined(OS_AIX)
typedef sem_t NativeHandle;
#elif defined(OS_WIN)
typedef HANDLE NativeHandle;
#endif
NativeHandle& native_handle() { return native_handle_; }
const NativeHandle& native_handle() const { return native_handle_; }
private:
NativeHandle native_handle_;
DISALLOW_COPY_AND_ASSIGN(Semaphore);
};
#endif // UTIL_SEMAPHORE_H_
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