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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>
#define NBR_CYCLE 10
#define NBR_TRAME 5
#define PTU 2000 // 2ms
#define HIGHEST_PRIORITY 99
int sync_counter=0;
////////////////////////////////////////////////////////////////////
typedef struct signaux_thread
{
int sync ;
char *(*schedule_table)[NBR_TRAME];
}signaux_thread;
//////////////////// THREAD GESTIONNAIRE
void sync_sig(int numero)
{
sync_counter++;
}
//////////////////FONCTION DU THREAD
void *func_thread (void *arg)
{
int j;
struct signaux_thread * signal= (struct signaux_thread *)arg;
fprintf(stderr,"sync frame number: %d\n ",signal->sync);
for (j=0;j<NBR_TRAME;j++)
{
fprintf(stderr,"la trame %s est envoyée\n",signal->schedule_table[signal->sync][j]);
}
}
/////////////////////////// MAIN
int main(void)
{
int i,j;
int err,PTU_ms;
pid_t pid;
pthread_attr_t attr;
struct sched_param param_processus;
struct sched_param param_thread ;
pthread_t thread;
char *ScheduleTable[NBR_CYCLE][NBR_TRAME];
struct signaux_thread arg;
struct timeval elapsed_time ;
struct timeval chrono;
int priority ;
struct sigevent ptu_event;
struct itimerspec ptu_period;
timer_t ptu_timer;
//int sync_counter;
///////initialisation du elapsed time
gettimeofday(&elapsed_time,NULL);
chrono=elapsed_time;
fprintf(stdout,"elapsed time= %d \n",elapsed_time.tv_usec-chrono.tv_usec);
//////////////// AFFECTATION PRIORITE TEMPS REEL FIFO
param_processus.sched_priority = HIGHEST_PRIORITY;
if (sched_setscheduler(0, SCHED_FIFO, ¶m_processus) != 0)
{
perror("sched_setscheduler");
exit(EXIT_FAILURE);
}
///////////////// AFFECTATION PRIORITE THREAD
pthread_attr_init(&attr);
if ((err=pthread_attr_setschedpolicy(&attr,SCHED_FIFO))!=0)
{
fprintf(stderr,"setschedpolicy: %s\n",strerror(err));
exit(EXIT_FAILURE);
}
if ((err=pthread_attr_setinheritsched(&attr,PTHREAD_EXPLICIT_SCHED))!=0)
{
fprintf(stderr,"setinheritshed: %s\n",strerror(err));
exit(EXIT_FAILURE);
}
param_thread.sched_priority=HIGHEST_PRIORITY;
if ((err=pthread_attr_setschedparam(&attr,¶m_thread))!=0)
{
fprintf(stderr,"setschedparam: %s\n",strerror(err));
exit(EXIT_FAILURE);
}
/////////////////////////////////////////////////////
arg.sync = 0;
sync_counter=arg.sync;
arg.schedule_table = ScheduleTable;
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;
}
//////////// REMPLISSAGE SCHEDULE TABLE
for ( i=0;i<NBR_CYCLE;i++)
{
for ( j=0;j<NBR_TRAME;j++)
{
ScheduleTable[i][j]=(char*)malloc(3 * sizeof(char));
sprintf(ScheduleTable[i][j],"%d.%d",i,j);
}
}
///////////////////// CREER UN SIGNAL
/* signal(SIGRTMIN,sync_sig);
ptu_event.sigev_notify=SIGEV_SIGNAL;
ptu_event.sigev_signo=SIGRTMIN;
PTU_ms=PTU*1000;
ptu_period.it_value.tv_sec=PTU_ms/1000000000;
ptu_period.it_value.tv_nsec=PTU_ms%1000000000;
ptu_period.it_interval=ptu_period.it_value;
if(timer_create(CLOCK_REALTIME,&ptu_event,&ptu_timer)!=0)
{
perror("timer_create");
exit(EXIT_FAILURE);
}
if(timer_settime(ptu_timer,0,&ptu_period,NULL)!=0)
{
perror("timer_settime");
exit(EXIT_FAILURE);
}*/
///////////////////// EXECUTION DU THREAD
while(1)
{////////solution avec sleep
if((err=pthread_create(&thread,& attr,func_thread,&arg)!=0))
{
fprintf(stderr,"can't create thread %s \n",strerror(err));
exit(EXIT_FAILURE);
}
usleep(PTU);
chrono=elapsed_time;
gettimeofday(&elapsed_time,NULL);
fprintf(stdout,"elapsed time= %d \n",((elapsed_time.tv_usec-chrono.tv_usec)));
arg.sync++;
if (arg.sync==NBR_CYCLE)
{arg.sync=0;}
}
/////////////2 eme solution avecun TIMER
/*arg.sync=sync_counter;
if (arg.sync==NBR_CYCLE)
{arg.sync=0;}
if((err=pthread_create(&thread,&attr,func_thread,&arg)!=0))
{
fprintf(stderr,"can't create thread %s \n",strerror(err));
exit(EXIT_FAILURE);
}
chrono=elapsed_time;
gettimeofday(&elapsed_time,NULL);
fprintf(stdout,"elapsed time= %d \n",(elapsed_time.tv_usec-chrono.tv_usec));
pause();
}*/
} |
probleme precision timer
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