117 lines
2.3 KiB
C++
117 lines
2.3 KiB
C++
// Copyright (C) 2007-2025 EQ2EMulator
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// Licensed under GPL v3
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#include "debug.h"
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#include "Condition.h"
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#ifdef WIN32
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#else
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#include <pthread.h>
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#include <sys/time.h>
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#include <errno.h>
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#endif
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#ifdef WIN32
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/*
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Windows does not support condition variables by default.
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So we use a simple hack of sleeping in wait() and doing
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nothing anywhere else.
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some possible places to look for ways to do this:
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http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
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http://sources.redhat.com/pthreads-win32/
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http://sources.redhat.com/cgi-bin/cvsweb.cgi/pthreads/pthread_cond_signal.c?rev=1.7&content-type=text/x-cvsweb-markup&cvsroot=pthreads-win32
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*/
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#define CONDITION_HACK_GRANULARITY 4
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Condition::Condition()
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{
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}
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void Condition::Signal()
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{
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}
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void Condition::SignalAll()
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{
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}
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void Condition::Wait()
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{
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Sleep(CONDITION_HACK_GRANULARITY);
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}
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Condition::~Condition()
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{
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}
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#else //!WIN32
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Condition::Condition()
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{
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pthread_cond_init(&cond,NULL);
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pthread_mutex_init(&mutex,NULL);
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}
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void Condition::Signal()
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{
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pthread_mutex_lock(&mutex);
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pthread_cond_signal(&cond);
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pthread_mutex_unlock(&mutex);
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}
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void Condition::SignalAll()
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{
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pthread_mutex_lock(&mutex);
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pthread_cond_broadcast(&cond);
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pthread_mutex_unlock(&mutex);
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}
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void Condition::Wait()
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{
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pthread_mutex_lock(&mutex);
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pthread_cond_wait(&cond,&mutex);
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pthread_mutex_unlock(&mutex);
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}
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/*
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I commented this specifically because I think it might be very
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difficult to write a windows counterpart to it, so I would like
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to discourage its use until we can confirm that it can be reasonably
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implemented on windows.
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bool Condition::TimedWait(unsigned long usec)
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{
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struct timeval now;
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struct timespec timeout;
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int retcode=0;
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pthread_mutex_lock(&mutex);
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gettimeofday(&now,NULL);
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now.tv_usec+=usec;
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timeout.tv_sec = now.tv_sec + (now.tv_usec/1000000);
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timeout.tv_nsec = (now.tv_usec%1000000) *1000;
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//cout << "now=" << now.tv_sec << "."<<now.tv_usec << endl;
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//cout << "timeout=" << timeout.tv_sec << "."<<timeout.tv_nsec << endl;
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retcode=pthread_cond_timedwait(&cond,&mutex,&timeout);
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pthread_mutex_unlock(&mutex);
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return retcode!=ETIMEDOUT;
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}
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*/
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Condition::~Condition()
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{
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pthread_mutex_lock(&mutex);
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pthread_cond_broadcast(&cond);
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pthread_cond_destroy(&cond);
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pthread_mutex_unlock(&mutex);
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pthread_mutex_destroy(&mutex);
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}
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#endif
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