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/*
Copyright (C) (2004 - 2006) (Venkata Ramana Enaganti) <ramana@intraperson.com>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later
version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* for creating threads*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include "msg.h"
#include "thread.h"
/*If it is 32bit machine you might want to optimize this value.
This value given is not portable. Better to do own tuning and testing.*/
#if 1
#define THREAD_STACKSZ (0) /*OPTIMIZE*/
#else
#define THREAD_STACKSZ (400000) /*Tested value for Fedora 3 IA32*/
#endif
/*common attributes for all threads*/
static pthread_attr_t cmn_attr;
static pthread_attr_t join_attr;
pthread_mutexattr_t common_mutex_attr;
pthread_condattr_t common_cond_attr;
static void thread_attribute_init( pthread_attr_t *attr,
int joinable, size_t stacksz )
{
int j = ( joinable ? PTHREAD_CREATE_JOINABLE
: PTHREAD_CREATE_DETACHED );
if( ( errno = pthread_attr_init( attr ) ) )
msglog( MSG_FATAL|LOG_ERRNO, "thread_attribute_init: " \
"pthread_attr_init" );
if( ( errno = pthread_attr_setdetachstate( attr, j ) ) )
msglog( MSG_FATAL|LOG_ERRNO, "thread_attribute_init: " \
"pthread_attr_setdetachstate" );
if( stacksz && ( errno = pthread_attr_setstacksize( attr, stacksz ) ) )
msglog( MSG_FATAL|LOG_ERRNO, "thread_attribute_init: " \
"pthread_attr_setstacksize %d", stacksz );
if( ( errno = pthread_attr_setscope( attr, PTHREAD_SCOPE_SYSTEM ) ) )
msglog( MSG_FATAL|LOG_ERRNO, "thread_attribute_init: " \
"pthread_attr_setscope PTHREAD_SCOPE_SYSTEM" );
}
static void mutexattr_init(void)
{
const char *myname = "mutex_init";
if( ( errno = pthread_mutexattr_init( &common_mutex_attr ) ) )
msglog( MSG_FATAL|LOG_ERRNO, "%s: pthread_mutexattr_init",
myname );
if( ( errno = pthread_mutexattr_setpshared( &common_mutex_attr,
PTHREAD_PROCESS_PRIVATE ) ) )
msglog( MSG_FATAL|LOG_ERRNO, "%s: pthread_mutexattr_setpshared " \
"PTHREAD_PROCESS_PRIVATE", myname );
if( ( errno = pthread_mutexattr_settype( &common_mutex_attr,
PTHREAD_MUTEX_NORMAL ) ) )
msglog( MSG_FATAL|LOG_ERRNO, "%s: pthread_mutexattr_settype " \
"PTHREAD_MUTEX_NORMAL: %m", myname );
}
static void condattr_init(void)
{
const char *myname = "condattr_init";
if ( ( errno = pthread_condattr_init( &common_cond_attr ) ) )
msglog(MSG_FATAL|LOG_ERRNO, "%s: pthread_condattr_init",
myname);
if ( ( errno = pthread_condattr_setpshared( &common_cond_attr,
PTHREAD_PROCESS_PRIVATE ) ) )
msglog( MSG_FATAL|LOG_ERRNO, "%s: pthread_condattr_setpshared: " \
"PTHREAD_PROCESS_PRIVATE", myname);
#if defined _POSIX_CLOCK_SELECTION && _POSIX_CLOCK_SELECTION >= 0
#if defined(_POSIX_TIMERS) && (_POSIX_TIMERS > 0)
#if defined(_POSIX_MONOTONIC_CLOCK) && (_POSIX_MONOTONIC_CLOCK >= 0)
if ( ( errno = pthread_condattr_setclock(&common_cond_attr,
CLOCK_MONOTONIC ) ) )
msglog( MSG_FATAL|LOG_ERRNO, "%s: pthread_condattr_setclock",
myname );
#else
#warning "CLOCK_MONOTONIC not available. using CLOCK_REALTIME"
if ( ( errno = pthread_condattr_setclock( &common_cond_attr,
CLOCK_REALTIME ) ) )
msglog( MSG_FATAL|LOG_ERRNO, "%s: pthread_condattr_setclock",
myname );
#endif
#endif
#endif
}
void thread_init( void )
{
/*common attributes*/
thread_attribute_init( &cmn_attr, 0, THREAD_STACKSZ );
/*joinable attributes*/
thread_attribute_init( &join_attr, 1, THREAD_STACKSZ );
mutexattr_init();
condattr_init();
}
#define DEFAULT_RETRY_WAIT 5
/*We can not simply exit or report error back
if there is failure starting a thread
because of resource scarcity.
*/
pthread_t thread_new_wait( void *( *th_func )( void * ),
void *data, time_t retry )
{
pthread_t pt;
if( retry <= 0 )
retry = DEFAULT_RETRY_WAIT;
while( ( errno = pthread_create( &pt, &cmn_attr, th_func,data ) ) )
{
msglog( MSG_ERR|LOG_ERRNO, "thread_new_wait: " \
"pthread_create" );
/*real BOTTLE-NECK if you are not careful*/
sleep( retry );
}
return pt;
}
int thread_new( void *( *th_func )( void * ),
void *data, pthread_t *pt )
{
pthread_t p;
if( ( errno = pthread_create( &p, &cmn_attr, th_func, data) ) )
{
msglog( MSG_ERR|LOG_ERRNO, "thread_new: pthread_create" );
if( pt ) *pt = 0;
return 0;
}
if( pt ) *pt = p;
return 1;
}
/* these threads can be joined by others. Watch out for memory leaks.*/
int thread_new_joinable( void *( *th_func )( void * ),
void *data, pthread_t *pt )
{
pthread_t p;
if( ( errno = pthread_create( &p, &join_attr, th_func, data ) ) )
{
msglog( MSG_ERR|LOG_ERRNO, "thread_new_joinable: " \
"pthread_create" );
if( pt ) *pt = 0;
return 0;
}
if( pt ) *pt = p;
return 1;
}
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