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496b337b27
* Remove broken RecycledObjectPool * Fix beast::ServiceQueue using List instead of LockFreeStack * Add class semaphore, fixes broken Semaphore * Move crytpo module files to new beast directory * Use c++11 replacements for boost and beast types: - std::atomic instead of beast::Atomic - std::function instead of boost::function, beast::function - std::unique_ptr instead of beast::ScopedPointer - std::shared_ptr instead of boost::shared_ptr * Remove modules: - beast_db - beast_crypto - beast_extras * Remove unnecessary classes: - AbstractFifo - AddConst - AtomicCounter - AtomicFlag - AtomicPointer - AtomicState - CopyConst - Expression - ForwardList - IfCond - Interval - IntrusiveArray - KeyvaDB - PointerToOther - PointerTraits - RemoveConst - RemoveConstVolatile - RemoveReference - RemoveVolatile - SharedObjectArray - SingleThreadedSharedObject - SophiaDB factory - SortedSet - WeakReference - beast::unique_ptr
87 lines
2.4 KiB
C++
87 lines
2.4 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef BEAST_THREADS_SEMAPHORE_H_INCLUDED
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#define BEAST_THREADS_SEMAPHORE_H_INCLUDED
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#include <condition_variable>
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#include <mutex>
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namespace beast {
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template <class Mutex, class CondVar>
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class basic_semaphore
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{
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private:
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typedef std::unique_lock <Mutex> scoped_lock;
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Mutex m_mutex;
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CondVar m_cond;
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std::size_t m_count;
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public:
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typedef std::size_t size_type;
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/** Create the semaphore, with an optional initial count.
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If unspecified, the initial count is zero.
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*/
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explicit basic_semaphore (size_type count = 0)
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: m_count (count)
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{
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}
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/** Increment the count and unblock one waiting thread. */
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void notify ()
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{
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scoped_lock lock (m_mutex);
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++m_count;
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m_cond.notify_one ();
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}
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// Deprecated, for backward compatibility
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void signal () { notify (); }
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/** Block until notify is called. */
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void wait ()
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{
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scoped_lock lock (m_mutex);
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while (m_count == 0)
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m_cond.wait (lock);
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--m_count;
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}
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/** Perform a non-blocking wait.
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@return `true` If the wait would be satisfied.
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*/
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bool try_wait ()
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{
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scoped_lock lock (m_mutex);
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if (m_count == 0)
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return false;
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--m_count;
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return true;
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}
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};
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typedef basic_semaphore <std::mutex, std::condition_variable> semaphore;
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}
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#endif
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