150 lines
2.7 KiB
C++
150 lines
2.7 KiB
C++
/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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/*
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QM DSP Library
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Centre for Digital Music, Queen Mary, University of London.
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This file copyright Chris Cannam, used with permission.
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*/
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#ifndef _THREAD_H_
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#define _THREAD_H_
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#ifdef _WIN32
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#include <windows.h>
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#else /* !_WIN32 */
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#ifdef USE_PTHREADS
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#include <pthread.h>
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#endif /* USE_PTHREADS */
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#endif /* !_WIN32 */
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#include <string>
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//#define DEBUG_THREAD 1
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//#define DEBUG_MUTEX 1
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//#define DEBUG_CONDITION 1
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class Thread
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{
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public:
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#ifdef _WIN32
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typedef HANDLE Id;
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#else
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#ifdef USE_PTHREADS
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typedef pthread_t Id;
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#endif
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#endif
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Thread();
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virtual ~Thread();
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Id id();
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void start();
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void wait();
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static bool threadingAvailable();
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protected:
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virtual void run() = 0;
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private:
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#ifdef _WIN32
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HANDLE m_id;
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bool m_extant;
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static DWORD WINAPI staticRun(LPVOID lpParam);
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#else
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#ifdef USE_PTHREADS
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pthread_t m_id;
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bool m_extant;
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static void *staticRun(void *);
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#endif
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#endif
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};
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class Mutex
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{
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public:
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Mutex();
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~Mutex();
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void lock();
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void unlock();
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bool trylock();
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private:
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#ifdef _WIN32
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HANDLE m_mutex;
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#ifndef NO_THREAD_CHECKS
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DWORD m_lockedBy;
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#endif
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#else
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#ifdef USE_PTHREADS
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pthread_mutex_t m_mutex;
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#ifndef NO_THREAD_CHECKS
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pthread_t m_lockedBy;
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bool m_locked;
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#endif
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#endif
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#endif
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};
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class MutexLocker
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{
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public:
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MutexLocker(Mutex *);
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~MutexLocker();
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private:
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Mutex *m_mutex;
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};
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class Condition
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{
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public:
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Condition(std::string name);
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~Condition();
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// Condition bundles a pthread-style condition variable and mutex
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// into one class.
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// To wait on a condition, call lock(), test termination variables
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// as appropriate, and then wait(). The condition will be
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// unlocked for the duration of the wait() call, which will end
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// when the condition is signalled. The condition will be locked
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// again when wait() returns.
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//
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// To signal a condition, call signal(). If the waiting thread
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// will be performing tests between its own lock() and wait(),
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// then the signalling thread should also lock() before it signals
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// (and then unlock afterwards). If the signalling thread always
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// locks the mutex during signalling, then the waiting thread
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// knows that signals will only happen during wait() and not be
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// missed at other times.
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void lock();
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void unlock();
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void wait(int us = 0);
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void signal();
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private:
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#ifdef _WIN32
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HANDLE m_mutex;
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HANDLE m_condition;
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bool m_locked;
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#else
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#ifdef USE_PTHREADS
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pthread_mutex_t m_mutex;
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pthread_cond_t m_condition;
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bool m_locked;
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#endif
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#endif
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#ifdef DEBUG_CONDITION
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std::string m_name;
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#endif
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};
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#endif
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