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Condition.h
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Condition.h
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/*---------------------------------------------------------------
* Copyright (c) 1999,2000,2001,2002,2003
* The Board of Trustees of the University of Illinois
* All Rights Reserved.
*---------------------------------------------------------------
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software (Iperf) and associated
* documentation files (the "Software"), to deal in the Software
* without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of the Software, and to permit
* persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and
* the following disclaimers.
*
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimers in the documentation and/or other materials
* provided with the distribution.
*
*
* Neither the names of the University of Illinois, NCSA,
* nor the names of its contributors may be used to endorse
* or promote products derived from this Software without
* specific prior written permission.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE CONTIBUTORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
* ________________________________________________________________
* National Laboratory for Applied Network Research
* National Center for Supercomputing Applications
* University of Illinois at Urbana-Champaign
* http://www.ncsa.uiuc.edu
* ________________________________________________________________
*
* Condition.h
* by Mark Gates <mgates@nlanr.net>
* -------------------------------------------------------------------
* An abstract class for waiting on a condition variable. If
* threads are not available, this does nothing.
* ------------------------------------------------------------------- */
#ifndef CONDITION_H
#define CONDITION_H
#include "headers.h"
#include "Mutex.h"
#include "util.h"
#if defined( HAVE_POSIX_THREAD )
typedef struct Condition {
pthread_cond_t mCondition;
pthread_mutex_t mMutex;
} Condition;
#elif defined( HAVE_WIN32_THREAD )
typedef struct Condition {
HANDLE mCondition;
HANDLE mMutex;
} Condition;
#else
typedef struct Condition {
int mCondition;
int mMutex;
} Condition;
#endif
#define Condition_Lock( Cond ) Mutex_Lock( &Cond.mMutex )
#define Condition_Unlock( Cond ) Mutex_Unlock( &Cond.mMutex )
// initialize condition
#if defined( HAVE_POSIX_THREAD )
#define Condition_Initialize( Cond ) do { \
Mutex_Initialize( &(Cond)->mMutex ); \
pthread_cond_init( &(Cond)->mCondition, NULL ); \
} while ( 0 )
#elif defined( HAVE_WIN32_THREAD )
// set all conditions to be broadcast
// unfortunately in Win32 you have to know at creation
// whether the signal is broadcast or not.
#define Condition_Initialize( Cond ) do { \
Mutex_Initialize( &(Cond)->mMutex ); \
(Cond)->mCondition = CreateEvent( NULL, true, false, NULL ); \
} while ( 0 )
#else
#define Condition_Initialize( Cond )
#endif
// destroy condition
#if defined( HAVE_POSIX_THREAD )
#define Condition_Destroy( Cond ) do { \
pthread_cond_destroy( &(Cond)->mCondition ); \
Mutex_Destroy( &(Cond)->mMutex ); \
} while ( 0 )
#elif defined( HAVE_WIN32_THREAD )
#define Condition_Destroy( Cond ) do { \
CloseHandle( (Cond)->mCondition ); \
Mutex_Destroy( &(Cond)->mMutex ); \
} while ( 0 )
#else
#define Condition_Destroy( Cond )
#endif
// sleep this thread, waiting for condition signal
#if defined( HAVE_POSIX_THREAD )
#define Condition_Wait( Cond ) pthread_cond_wait( &(Cond)->mCondition, &(Cond)->mMutex )
#elif defined( HAVE_WIN32_THREAD )
// atomically release mutex and wait on condition,
// then re-acquire the mutex
#define Condition_Wait( Cond ) do { \
SignalObjectAndWait( (Cond)->mMutex, (Cond)->mCondition, INFINITE, false ); \
Mutex_Lock( &(Cond)->mMutex ); \
} while ( 0 )
#else
#define Condition_Wait( Cond )
#endif
// sleep this thread, waiting for condition signal,
// but bound sleep time by the relative time inSeconds.
#if defined( HAVE_POSIX_THREAD )
#define Condition_TimedWait( Cond, inSeconds ) do { \
struct timespec absTimeout; \
absTimeout.tv_sec = time( NULL ) + inSeconds; \
absTimeout.tv_nsec = 0; \
pthread_cond_timedwait( &(Cond)->mCondition, &(Cond)->mMutex, &absTimeout ); \
} while ( 0 )
#elif defined( HAVE_WIN32_THREAD )
// atomically release mutex and wait on condition,
// then re-acquire the mutex
#define Condition_TimedWait( Cond, inSeconds ) do { \
SignalObjectAndWait( (Cond)->mMutex, (Cond)->mCondition, inSeconds*1000, false ); \
Mutex_Lock( &(Cond)->mMutex ); \
} while ( 0 )
#else
#define Condition_TimedWait( Cond, inSeconds )
#endif
// send a condition signal to wake one thread waiting on condition
// in Win32, this actually wakes up all threads, same as Broadcast
// use PulseEvent to auto-reset the signal after waking all threads
#if defined( HAVE_POSIX_THREAD )
#define Condition_Signal( Cond ) pthread_cond_signal( &(Cond)->mCondition )
#elif defined( HAVE_WIN32_THREAD )
#define Condition_Signal( Cond ) PulseEvent( (Cond)->mCondition )
#else
#define Condition_Signal( Cond )
#endif
// send a condition signal to wake all threads waiting on condition
#if defined( HAVE_POSIX_THREAD )
#define Condition_Broadcast( Cond ) pthread_cond_broadcast( &(Cond)->mCondition )
#elif defined( HAVE_WIN32_THREAD )
#define Condition_Broadcast( Cond ) PulseEvent( (Cond)->mCondition )
#else
#define Condition_Broadcast( Cond )
#endif
#endif // CONDITION_H