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| #define _GNU_SOURCE
#include <pthread.h>
#include <stdio.h>
#include <sched.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <time.h>
#include <unistd.h>
#include <sys/types.h>
#include <semaphore.h>
#include <sys/syscall.h>
//////////////////////
#define sigev_notify_function _sigev_un._sigev_thread._function
#define sigev_notify_attributes _sigev_un._sigev_thread._attribute
#define sigev_notify_thread_id _sigev_un._tid
//////////////////////
#define PERIOD_SIG SIGRTMIN
#define NBR_CYCLE 20
#define NBR_TRAME 1
#define PTU_NS 2000000 // 2ms
#define HIGHEST_PRIORITY 99
/////////////////// CREATION DES SEMAPHORES
sem_t sync_pass, slave_pass;
//////////////////Gobals
int master_ID;
int sync_sig=-1;
int nodes_nbr=1;
struct timeval last;
///////////////////Function qui retourne le TID
static pid_t mygettid(void)
{
return syscall(SYS_gettid);
}
/////////////////// MASTER_FUNC
void * master_func()
{
///
struct timeval begin;
struct timeval last;
long long int difference = 0;
////
int global_cycle = 0 ;
//////////Creer un timer de 2 ms
struct itimerspec ptu_period;
timer_t ptu_timer;
sigset_t mask;
struct sigevent ptu_event = {
.sigev_notify = SIGEV_THREAD_ID,
.sigev_signo = PERIOD_SIG,
.sigev_notify_thread_id = mygettid(),
};
/* Bloque le signal PERIOD_SIG pour le thread appelant uniquement */
if (sigemptyset(&mask) ||
sigaddset(&mask, PERIOD_SIG) ||
sigprocmask(SIG_BLOCK, &mask, NULL))
pthread_exit((void *) 10);
siginfo_t si;
int sig;
if (timer_create(CLOCK_REALTIME, &ptu_event, &ptu_timer))
pthread_exit((void *) 11);
ptu_period.it_value.tv_sec = 0;
ptu_period.it_value.tv_nsec = PTU_NS;
ptu_period.it_interval.tv_sec = 0;
ptu_period.it_interval.tv_nsec = PTU_NS;
if (timer_settime(ptu_timer, 0, &ptu_period, NULL))
pthread_exit((void *) 12);
/////////////////////////////
while(1)
{
if ((sig = sigwaitinfo(&mask, &si)) < 0)
pthread_exit((void *) 13);
if (sig != PERIOD_SIG)
continue;
///////////////////////////// Tache a repeter chaque 2 ms
gettimeofday(&begin, NULL);
difference += 1000000 * (begin.tv_sec - last.tv_sec);
difference += (begin.tv_usec - last.tv_usec);
last=begin;
sem_wait(&sync_pass);
sync_sig++;
sync_sig %= NBR_CYCLE;
if (sync_sig==0)
{
global_cycle=global_cycle+1;
fprintf(stdout,"New cycle = %d\n", global_cycle);
}
fprintf(stdout,"The Master is talking (%d) elapsed time (%6lld) \n",sync_sig,difference);
difference = 0;
sem_post(&sync_pass);
sched_yield();
}
return(0);
}
///////////////////// SLAVE_FUNC
void *slave_func(void *slave_data)
{
while(1)
{
sem_wait(&sync_pass);
sem_wait(&slave_pass);
fprintf(stdout,"slave (%lu) is talking the current sync is (%d) \n",pthread_self(),sync_sig);
sem_post(&slave_pass);
sem_post(&sync_pass);
pause();
}
return(0);
}
////////////////MAIN
int main ()
{
int val,i,j;
int err,priority;
struct sched_param param_processus;
struct sched_param param_master_thr , param_slave_thr ;
pthread_attr_t master_attr , slave_attr;
pthread_t master_thr, slave_thr[nodes_nbr];
///////////////// AFFECTATION PRIORITE TEMPS REEL FIFO
param_processus.sched_priority = HIGHEST_PRIORITY;
if (sched_setscheduler(0, SCHED_FIFO, ¶m_processus) != 0)
{
perror("processus sched_setscheduler");
exit(EXIT_FAILURE);
}
priority=sched_getscheduler(0);
switch (priority)
{
case SCHED_FIFO :
fprintf(stdout,"FIFO PRIORITY IS : %d \n",param_processus.sched_priority);
break;
case SCHED_RR :
fprintf(stdout,"ROUND ROBIN PRIORITY IS : %d \n",param_processus.sched_priority);
break;
default:
fprintf(stdout,"OTHER PRIORITY USED \n");
break;
}
///////////////// PREPARATION DES ATTRIBUTS DU MASTER_THREAD
pthread_attr_init(&master_attr);
if ((err=pthread_attr_setschedpolicy(&master_attr,SCHED_FIFO))!=0)
{
fprintf(stderr,"setschedpolicy master thread: %s\n",strerror(err));
exit(EXIT_FAILURE);
}
if ((err=pthread_attr_setinheritsched(&master_attr,PTHREAD_EXPLICIT_SCHED))!=0)
{
fprintf(stderr,"setinheritshed master thread: %s\n",strerror(err));
exit(EXIT_FAILURE);
}
param_master_thr.sched_priority = 99;
if ((err=pthread_attr_setschedparam(&master_attr,¶m_master_thr))!=0)
{
fprintf(stderr,"setschedparam master thread: %s\n",strerror(err));
exit(EXIT_FAILURE);
}
///////////////// PREPARATION DES ATTRIBUTS DU SLAVE_THREAD
pthread_attr_init(&slave_attr);
if ((err=pthread_attr_setschedpolicy(&slave_attr,SCHED_FIFO))!=0)
{
fprintf(stderr,"setschedpolicy slave thread: %s\n",strerror(err));
exit(EXIT_FAILURE);
}
if ((err=pthread_attr_setinheritsched(&slave_attr,PTHREAD_EXPLICIT_SCHED))!=0)
{
fprintf(stderr,"setinheritshed slave thread: %s\n",strerror(err));
exit(EXIT_FAILURE);
}
param_slave_thr.sched_priority = 50;
if ((err=pthread_attr_setschedparam(&slave_attr,¶m_slave_thr))!=0)
{
fprintf(stderr,"setschedparam slave thread: %s\n",strerror(err));
exit(EXIT_FAILURE);
}
////////////////// INITIALISATION DES SEMAPHORES
if (sem_init(&sync_pass,0,1)==-1)
{
perror("sync sem init");
exit (EXIT_FAILURE);
}
if (sem_init(&slave_pass,0,nodes_nbr)==-1)
{
perror("slave sem init");
exit (EXIT_FAILURE);
}
///
gettimeofday(&last, NULL);
///////////////////// EXECUTION DES THREAD
if((err=pthread_create(&master_thr,&master_attr,master_func,NULL)!=0))
{
fprintf(stderr,"can't create master thread %s \n",strerror(err));
exit(EXIT_FAILURE);
}
for ( i=0;i<nodes_nbr;i++)
{
if((err=pthread_create(&slave_thr[i],&slave_attr,slave_func,NULL)!=0))
{
fprintf(stderr,"can't create slave thread %s \n",strerror(err));
exit(EXIT_FAILURE);
}
}
//
/// ATTENTE DE TOUS LES THREAD
pthread_join(master_thr, NULL);
for ( i=0;i<nodes_nbr;i++)
{
pthread_join(slave_thr[i], NULL);
}
return (0);
} |
