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/********************************************************************************
* *
* C o n d i t i o n C l a s s *
* *
*********************************************************************************
* Copyright (C) 2004,2022 by Jeroen van der Zijp. All Rights Reserved. *
*********************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This library is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/> *
********************************************************************************/
#include "xincs.h"
#include "fxver.h"
#include "fxdefs.h"
#include "FXMutex.h"
#include "FXCondition.h"
/*
Notes:
- Condition variable.
*/
using namespace FX;
/*******************************************************************************/
namespace FX {
// Initialize condition
FXCondition::FXCondition(){
#if defined(WIN32) && (_WIN32_WINNT >= 0x0600) // Vista or newer
// If this fails on your machine, determine what value
// of sizeof(pthread_cond_t) is supposed to be on your
// machine and mail it to: jeroen@fox-toolkit.net!!
FXASSERT_STATIC(sizeof(data)>=sizeof(CONDITION_VARIABLE));
InitializeConditionVariable((CONDITION_VARIABLE*)data);
#elif defined(WIN32)
// If this fails on your machine, determine what value
// of sizeof(pthread_cond_t) is supposed to be on your
// machine and mail it to: jeroen@fox-toolkit.net!!
//FXTRACE((150,"sizeof(CRITICAL_SECTION)+sizeof(HANDLE)+sizeof(HANDLE)+sizeof(FXuval)=%d\n",sizeof(CRITICAL_SECTION)+sizeof(HANDLE)+sizeof(HANDLE)+sizeof(FXuval)));
FXASSERT_STATIC(sizeof(data)>=sizeof(CRITICAL_SECTION)+sizeof(HANDLE)+sizeof(HANDLE)+sizeof(FXuval));
data[0]=(FXuval)CreateEvent(nullptr,0,0,nullptr); // Wakes one, autoreset
data[1]=(FXuval)CreateEvent(nullptr,1,0,nullptr); // Wakes all, manual reset
data[2]=0; // Blocked count
InitializeCriticalSection((CRITICAL_SECTION*)&data[3]); // Critical section
#else
// If this fails on your machine, determine what value
// of sizeof(pthread_cond_t) is supposed to be on your
// machine and mail it to: jeroen@fox-toolkit.net!!
//FXTRACE((150,"sizeof(pthread_cond_t)=%d\n",sizeof(pthread_cond_t)));
FXASSERT_STATIC(sizeof(data)>=sizeof(pthread_cond_t));
pthread_cond_init((pthread_cond_t*)data,nullptr);
#endif
}
// Wake up one single waiting thread
void FXCondition::signal(){
#if defined(WIN32) && (_WIN32_WINNT >= 0x0600) // Vista or newer
WakeConditionVariable((CONDITION_VARIABLE*)data);
#elif defined(WIN32)
EnterCriticalSection((CRITICAL_SECTION*)&data[3]);
int blocked=(data[2]>0);
LeaveCriticalSection((CRITICAL_SECTION*)&data[3]);
if(blocked) SetEvent((HANDLE)data[0]);
#else
pthread_cond_signal((pthread_cond_t*)data);
#endif
}
// Wake up all waiting threads
void FXCondition::broadcast(){
#if defined(WIN32) && (_WIN32_WINNT >= 0x0600) // Vista or newer
WakeAllConditionVariable((CONDITION_VARIABLE*)data);
#elif defined(WIN32)
EnterCriticalSection((CRITICAL_SECTION*)&data[3]);
int blocked=(data[2]>0);
LeaveCriticalSection((CRITICAL_SECTION*)&data[3]);
if(blocked) SetEvent((HANDLE)data[1]);
#else
pthread_cond_broadcast((pthread_cond_t*)data);
#endif
}
// Wait
FXbool FXCondition::wait(FXMutex& mtx){
#if defined(WIN32) && (_WIN32_WINNT >= 0x0600) // Vista or newer
return SleepConditionVariableCS((CONDITION_VARIABLE*)data,(CRITICAL_SECTION*)mtx.data,INFINITE)!=0;
#elif defined(WIN32)
EnterCriticalSection((CRITICAL_SECTION*)&data[3]);
data[2]++;
LeaveCriticalSection((CRITICAL_SECTION*)&data[3]);
mtx.unlock();
DWORD result=WaitForMultipleObjects(2,(HANDLE*)data,0,INFINITE);
EnterCriticalSection((CRITICAL_SECTION*)&data[3]);
data[2]--;
int last_waiter=(result==WAIT_OBJECT_0+1)&&(data[2]==0); // Unblocked by broadcast & no other blocked threads
LeaveCriticalSection((CRITICAL_SECTION*)&data[3]);
if(last_waiter) ResetEvent((HANDLE)data[1]); // Reset signal
mtx.lock();
return (WAIT_OBJECT_0+0==result)||(result==WAIT_OBJECT_0+1);
#else
return pthread_cond_wait((pthread_cond_t*)data,(pthread_mutex_t*)mtx.data)==0;
#endif
}
// Wait using single global mutex
FXbool FXCondition::wait(FXMutex& mtx,FXTime nsec){
#if defined(WIN32) && (_WIN32_WINNT >= 0x0600) // Vista or newer
if(0<nsec){
DWORD delay=INFINITE;
if(nsec<forever) delay=nsec/1000000;
return SleepConditionVariableCS((CONDITION_VARIABLE*)data,(CRITICAL_SECTION*)mtx.data,delay)!=0;
}
return false;
#elif defined(WIN32)
if(0<nsec){
DWORD delay=INFINITE;
if(nsec<forever) delay=(DWORD)(nsec/1000000);
EnterCriticalSection((CRITICAL_SECTION*)&data[3]);
data[2]++;
LeaveCriticalSection((CRITICAL_SECTION*)&data[3]);
mtx.unlock();
DWORD result=WaitForMultipleObjects(2,(HANDLE*)data,0,delay);
EnterCriticalSection((CRITICAL_SECTION*)&data[3]);
data[2]--;
int last_waiter=(result==WAIT_OBJECT_0+1)&&(data[2]==0); // Unblocked by broadcast & no other blocked threads
LeaveCriticalSection((CRITICAL_SECTION*)&data[3]);
if(last_waiter) ResetEvent((HANDLE)data[1]); // Reset signal
mtx.lock();
return (WAIT_OBJECT_0+0==result)||(result==WAIT_OBJECT_0+1);
}
return false;
#else
if(0<nsec){
if(nsec<forever){
#if (_POSIX_C_SOURCE >= 199309L)
struct timespec ts;
clock_gettime(CLOCK_REALTIME,&ts);
ts.tv_sec=ts.tv_sec+(ts.tv_nsec+nsec)/1000000000;
ts.tv_nsec=(ts.tv_nsec+nsec)%1000000000;
return pthread_cond_timedwait((pthread_cond_t*)data,(pthread_mutex_t*)mtx.data,&ts)==0;
#else
struct timespec ts;
struct timeval tv;
gettimeofday(&tv,nullptr);
tv.tv_usec*=1000;
ts.tv_sec=tv.tv_sec+(tv.tv_usec+nsec)/1000000000;
ts.tv_nsec=(tv.tv_usec+nsec)%1000000000;
return pthread_cond_timedwait((pthread_cond_t*)data,(pthread_mutex_t*)mtx.data,&ts)==0;
#endif
}
return pthread_cond_wait((pthread_cond_t*)data,(pthread_mutex_t*)mtx.data)==0;
}
return false;
#endif
}
// Delete condition
FXCondition::~FXCondition(){
#if defined(WIN32) && (_WIN32_WINNT >= 0x0600) // Vista or newer
// NOP //
#elif defined(WIN32)
CloseHandle((HANDLE)data[0]);
CloseHandle((HANDLE)data[1]);
DeleteCriticalSection((CRITICAL_SECTION*)&data[3]);
#else
pthread_cond_destroy((pthread_cond_t*)data);
#endif
}
}
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