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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 <unistd.h>
#include <sys/time.h>
#include <semaphore.h>
#define NBR_CYCLE 3
#define NBR_TRAME 1
#define PTU 2000 // 2ms
#define HIGHEST_PRIORITY 99
////////////////////////////////////////////////////////////////////
int nodes_nbr;
char *schedule_table[NBR_CYCLE][NBR_TRAME];
int using_priority_sched;
int priority_queu;
int master_ID;
int sync_sig=0;
/////////////////// CREATION DES SEMAPHORES
sem_t sync_pass, slave_pass;
/////////////////// MASTER_FUNC
void *master_func ()
{
int global_cycle = 0 ;
struct timeval begin, last, current;
long long int difference = 0;
sleep(1);
gettimeofday(&begin, NULL);
fprintf(stdout,"start [%ld.%06ld]\n", begin.tv_sec, begin.tv_usec);
current = begin;
while(1)
{
difference = 0;
do
{
last = current;
gettimeofday(¤t, NULL);
if ((current.tv_sec - begin.tv_sec) > 5)
{fprintf(stdout,"Exit timeout");
pthread_exit(NULL);
}
difference += 1000000 * (current.tv_sec - last.tv_sec);
difference += (current.tv_usec - last.tv_usec);
}while(difference < PTU);
//Le master_thread demande le semaphore
sem_wait(&sync_pass);
fprintf(stdout,"The Master is talking (%d) \n",sync_sig);
sync_sig++;
sync_sig %= NBR_CYCLE;
//Le master_thread relache le semaphore
if (sync_sig==0)
{
global_cycle=global_cycle+1;
fprintf(stdout,"New cycle (%d) and sync (%d)\n", global_cycle,sync_sig);
}
fprintf(stdout,"[%ld.%6ld] sync frame %4d diff = %6lld\n", current.tv_sec, current.tv_usec, sync_sig, difference);
sem_post(&sync_pass);
sched_yield();
}
return(0);
}
///////////////////// SLAVE_FUNC
void *slave_func(void *slave_data)
{
int j;
struct timeval tv;
while(1)
{
sem_wait(&slave_pass);
sem_wait(&sync_pass);
sync_sig++;
fprintf(stdout,"slave (%lu) is talking the current sync is (%d) \n",pthread_self(),sync_sig);
sem_post(&sync_pass);
sem_post(&slave_pass);
}
return(0);
}
////////////////MAIN
int main (int argc, char *argv[])
{
int val,i,j;
int err;
struct sched_param param_processus;
struct sched_param param_master_thr , param_slave_thr ;
pthread_attr_t master_attr , slave_attr;
////////////////// INITIALISATION DES SEMAPHORES
if (sem_init(&sync_pass,0,1)==-1)
{
perror("sync sem init");
exit (EXIT_FAILURE);
}
val=atoi(argv[1]);
fprintf(stdout,"val vaut: %d \n",val);
if (sem_init(&slave_pass,0,val)==-1)
{
perror("slave sem init");
exit (EXIT_FAILURE);
}
///////////////// 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);
}
///////////////// 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 = 99;
if ((err=pthread_attr_setschedparam(&slave_attr,¶m_slave_thr))!=0)
{
fprintf(stderr,"setschedparam slave thread: %s\n",strerror(err));
exit(EXIT_FAILURE);
}
///////////////////////////////////////////////////// PREPARATION MILCAN_DATA
nodes_nbr=atoi(argv[1]);
using_priority_sched=atoi(argv[2]);
master_ID=atoi(argv[3]);
pthread_t master_thr ,
slave_thr[nodes_nbr];
//////////// REMPLISSAGE SCHEDULE TABLE
for ( i=0;i<NBR_CYCLE;i++)
{
for ( j=0;j<NBR_TRAME;j++)
{
schedule_table[i][j]=(char*)malloc(3 * sizeof(char));
sprintf(schedule_table[i][j],"%d.%d",i,j);
}
}
///////////////////// EXECUTION DES THREAD
if((err=pthread_create(&master_thr,NULL,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],NULL,slave_func,NULL)!=0))
{
fprintf(stderr,"can't create slave thread %s \n",strerror(err));
exit(EXIT_FAILURE);
}
}
// ATTENTE DE TOUS LES THREApthread_join(master_thr, NULL);
for ( i=0;i<nodes_nbr;i++)
{
pthread_join(slave_thr[i], NULL);
}
//DESALLOCATION MEMOIRE
for ( i=0;i<NBR_CYCLE;i++)
{
for ( j=0;j<NBR_TRAME;j++)
{
free(schedule_table[i][j]);
}
}
return 0;
} |
Sémaphores et ordonnancement des threads
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