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