Tim Starling
71 linhas
2.7 KiB
C++
71 linhas
2.7 KiB
C++
/*
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+----------------------------------------------------------------------+
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| HipHop for PHP |
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+----------------------------------------------------------------------+
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| Copyright (c) 2010-2013 Facebook, Inc. (http://www.facebook.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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*/
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#ifndef incl_HPHP_SYNCHRONIZABLE_MULTI_H_
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#define incl_HPHP_SYNCHRONIZABLE_MULTI_H_
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#include "hphp/util/base.h"
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#include "hphp/util/mutex.h"
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#include "hphp/util/rank.h"
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namespace HPHP {
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///////////////////////////////////////////////////////////////////////////////
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/**
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* A Synchronizable object that has multiple conditional variables. The benefit
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* is, notify() can choose to notify the most recently waited conditional
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* variable for an altered scheduling that potentially wakes up a thread with
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* better thread caching.
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*/
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class SynchronizableMulti {
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public:
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explicit SynchronizableMulti(int size);
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virtual ~SynchronizableMulti();
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/**
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* "id" is an arbitrary number that locates the conditional variable to wait
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* on.
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*
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* "front" means adding this thread to front of the queue while waiting.
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* Otherwise, the thread is pushed to the back of the queue, being the last
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* to wake up, when notify() is called.
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*/
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void wait(int id, bool front);
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bool wait(int id, bool front, long seconds); // false if timed out
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bool wait(int id, bool front, long seconds, long long nanosecs);
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void notify();
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void notifyAll();
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Mutex &getMutex() { return m_mutex;}
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private:
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Mutex m_mutex;
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std::vector<pthread_cond_t> m_conds;
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std::list<pthread_cond_t*> m_cond_list;
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// iterators in std::list are valid even after element removal
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typedef hphp_hash_map<pthread_cond_t*, std::list<pthread_cond_t*>::iterator,
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pointer_hash<pthread_cond_t> > CondIterMap;
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CondIterMap m_cond_map;
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bool waitImpl(int id, bool front, timespec *ts);
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};
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///////////////////////////////////////////////////////////////////////////////
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}
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#endif // incl_HPHP_SYNCHRONIZABLE_MULTI_H_
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