42 lines
1 KiB
C++
42 lines
1 KiB
C++
/*
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Copyright (c) 2013 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#pragma once
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#include "util/thread.h"
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namespace lean {
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/**
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\brief The class \c unlock_guard is a mutex wrapper that provides a
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convenient RAII-style mechanism for releasing a mutex for the
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duration of a scoped block.
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It is the dual of lock_guard in the standard library.
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Example:
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<code>
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{
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lock_guard<mutex> lock(m);
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...
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{
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unlock_guard unlock(m);
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...
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}
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...
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}
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</code>
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\warning The calling thread must own the lock to m_mutex
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*/
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class unlock_guard {
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mutex & m_mutex;
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public:
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explicit unlock_guard(mutex & m):m_mutex(m) { m_mutex.unlock(); }
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unlock_guard(unlock_guard const &) = delete;
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unlock_guard(unlock_guard &&) = delete;
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unlock_guard & operator=(unlock_guard const &) = delete;
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unlock_guard & operator=(unlock_guard &&) = delete;
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~unlock_guard() { m_mutex.lock(); }
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};
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}
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