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SysSemaphore.cpp    292 lines (260 with data), 10.8 kB

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/*----------------------------------------------------------------------------*/
/* */
/* Copyright (c) 1995, 2004 IBM Corporation. All rights reserved. */
/* Copyright (c) 2005-2009 Rexx Language Association. All rights reserved. */
/* */
/* This program and the accompanying materials are made available under */
/* the terms of the Common Public License v1.0 which accompanies this */
/* distribution. A copy is also available at the following address: */
/* http://www.ibm.com/developerworks/oss/CPLv1.0.htm */
/* */
/* Redistribution and use in source and binary forms, with or */
/* without modification, are permitted provided that the following */
/* conditions are met: */
/* */
/* Redistributions of source code must retain the above copyright */
/* notice, this list of conditions and the following disclaimer. */
/* Redistributions in binary form must reproduce the above copyright */
/* notice, this list of conditions and the following disclaimer in */
/* the documentation and/or other materials provided with the distribution. */
/* */
/* Neither the name of Rexx Language Association nor the names */
/* of its contributors may be used to endorse or promote products */
/* derived from this software without specific prior written permission. */
/* */
/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS */
/* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT */
/* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS */
/* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT */
/* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED */
/* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, */
/* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY */
/* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING */
/* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS */
/* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/* */
/*----------------------------------------------------------------------------*/
/*****************************************************************************/
/* REXX Unix Support */
/* */
/* Semaphore support for Unix */
/* */
/*****************************************************************************/
/*****************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <pthread.h>
#include <memory.h>
#include <stdio.h>
#ifdef AIX
#include <sys/sched.h>
#include <time.h>
#endif
#if defined(OPSYS_SUN)
#include <sched.h>
#endif
#include <errno.h>
#include "SysSemaphore.hpp"
/* ********************************************************************** */
/* *** SysSemaphore *** */
/* ********************************************************************** */
/**
* Create a semaphore with potential creation-time
* initialization.
*
* @param create Indicates whether the semaphore should be created now.
*/
SysSemaphore::SysSemaphore(bool createSem)
{
if (createSem)
{
create();
}
}
void SysSemaphore::create()
{
int iRC = 0;
if (!created)
{
// Clear mutex/cond prior to init
// this->semMutex = NULL;
// this->semCond = NULL;
/* The original settings for pthread_mutexattr_settype() were:
AIX : PTHREAD_MUTEX_RECURSIVE
SUNOS: PTHREAD_MUTEX_ERRORCHECK
LINUX: PTHREAD_MUTEX_RECURSIVE_NP
*/
#if defined( HAVE_PTHREAD_MUTEXATTR_SETTYPE )
pthread_mutexattr_t mutexattr;
iRC = pthread_mutexattr_init(&mutexattr);
if ( iRC == 0 )
{
#if defined( HAVE_PTHREAD_MUTEX_RECURSIVE_NP ) /* Linux most likely */
iRC = pthread_mutexattr_settype(&mutexattr, PTHREAD_MUTEX_RECURSIVE_NP);
#elif defined( HAVE_PTHREAD_MUTEX_RECURSIVE )
iRC = pthread_mutexattr_settype(&mutexattr, PTHREAD_MUTEX_RECURSIVE);
#elif defined( HAVE_PTHREAD_MUTEX_ERRORCHECK )
iRC = pthread_mutexattr_settype(&mutexattr, PTHREAD_MUTEX_ERRORCHECK);
#else
fprintf(stderr," *** ERROR: Unknown 2nd argument to pthread_mutexattr_settype()!\n");
#endif
}
if ( iRC == 0 )
{
iRC = pthread_mutex_init(&(this->semMutex), &mutexattr);
}
if ( iRC == 0 )
{
iRC = pthread_mutexattr_destroy(&mutexattr); /* It does not affect */
}
if ( iRC == 0 ) /* mutexes created with it */
{
iRC = pthread_cond_init(&(this->semCond), NULL);
}
#else
iRC = pthread_mutex_init(&(this->semMutex), NULL);
if ( iRC == 0 )
{
iRC = pthread_cond_init(&(this->semCond), NULL);
}
#endif
if ( iRC != 0 )
{
fprintf(stderr," *** ERROR: At RexxSemaphore(), pthread_mutex_init - RC = %d !\n", iRC);
if ( iRC == EINVAL )
{
fprintf(stderr," *** ERROR: Application was not built thread safe!\n");
}
}
this->postedCount = 0;
created = true;
}
}
void SysSemaphore::close()
{
if (created)
{
pthread_cond_destroy(&(this->semCond));
pthread_mutex_destroy(&(this->semMutex));
created = false;
}
}
void SysSemaphore::post()
{
int rc;
rc = pthread_mutex_lock(&(this->semMutex)); //Lock the semaphores Mutex
postedCount++; //Increment post count
rc = pthread_cond_broadcast(&(this->semCond)); //allows any threads waiting to run
rc = pthread_mutex_unlock(&(this->semMutex)); // Unlock access to Semaphore mutex
}
void SysSemaphore::wait()
{
int rc;
int schedpolicy, i_prio;
struct sched_param schedparam;
pthread_getschedparam(pthread_self(), &schedpolicy, &schedparam);
i_prio = schedparam.sched_priority;
schedparam.sched_priority = 100;
pthread_setschedparam(pthread_self(),SCHED_OTHER, &schedparam);
rc = pthread_mutex_lock(&(this->semMutex)); // Lock access to semaphore
if (this->postedCount == 0) // Has it been posted?
{
rc = pthread_cond_wait(&(this->semCond), &(this->semMutex)); // Nope, then wait on it.
}
pthread_mutex_unlock(&(this->semMutex)); // Release mutex lock
schedparam.sched_priority = i_prio;
pthread_setschedparam(pthread_self(),SCHED_OTHER, &schedparam);
}
bool SysSemaphore::wait(uint32_t t) // takes a timeout in msecs
{
struct timespec timestruct;
time_t *Tpnt = NULL;
int result = 0;
timestruct.tv_nsec = 0;
timestruct.tv_sec = t/1000+time(Tpnt); // convert to secs and abstime
pthread_mutex_lock(&(this->semMutex)); // Lock access to semaphore
if (!this->postedCount) // Has it been posted?
{
// wait with timeout
result = pthread_cond_timedwait(&(this->semCond),&(this->semMutex),&timestruct);
}
pthread_mutex_unlock(&(this->semMutex)); // Release mutex lock
// a false return means this timed out
return result != ETIMEDOUT;
}
void SysSemaphore::reset()
{
pthread_mutex_lock(&(this->semMutex)); // Lock access to semaphore
this->postedCount = 0; // Clear value
pthread_mutex_unlock(&(this->semMutex)); // unlock access to semaphore
}
/* ********************************************************************** */
/* *** SysMutex *** */
/* ********************************************************************** */
/**
* Create a semaphore with potential creation-time
* initialization.
*
* @param create Indicates whether the semaphore should be created now.
*/
SysMutex::SysMutex(bool createSem)
{
if (createSem)
{
create();
}
}
void SysMutex::create()
{
// don't create this multiple times
if (created)
{
return;
}
int iRC = 0;
/* The original settings for pthread_mutexattr_settype() were:
SUNOS: PTHREAD_MUTEX_ERRORCHECK
LINUX: PTHREAD_MUTEX_RECURSIVE_NP
*/
#if defined( HAVE_PTHREAD_MUTEXATTR_SETTYPE )
pthread_mutexattr_t mutexattr;
iRC = pthread_mutexattr_init(&mutexattr);
if ( iRC == 0 )
{
#if defined( HAVE_PTHREAD_MUTEX_RECURSIVE_NP ) /* Linux most likely */
iRC = pthread_mutexattr_settype(&mutexattr, PTHREAD_MUTEX_RECURSIVE_NP);
#elif defined( HAVE_PTHREAD_MUTEX_RECURSIVE )
iRC = pthread_mutexattr_settype(&mutexattr, PTHREAD_MUTEX_RECURSIVE);
#elif defined( HAVE_PTHREAD_MUTEX_ERRORCHECK )
iRC = pthread_mutexattr_settype(&mutexattr, PTHREAD_MUTEX_ERRORCHECK);
#else
fprintf(stderr," *** ERROR: Unknown 2nd argument to pthread_mutexattr_settype()!\n");
#endif
}
if ( iRC == 0 )
{
iRC = pthread_mutex_init(&(this->mutexMutex), &mutexattr);
}
if ( iRC == 0 )
{
iRC = pthread_mutexattr_destroy(&mutexattr); /* It does not affect */
}
#else /* mutexes created with it */
iRC = pthread_mutex_init(&(this->mutexMutex), NULL);
#endif
if ( iRC != 0 )
{
fprintf(stderr," *** ERROR: At RexxMutex(), pthread_mutex_init - RC = %d !\n", iRC);
}
created = true;
}
void SysMutex::close()
{
if (created)
{
pthread_mutex_destroy(&(this->mutexMutex));
created = false;
}
}