check thread timers result

[evariste]

Hi,

can someone help me to complete my code with a function that can check the result of a timer "check_timer" and another one that reset this timer if it had expired "reset_timer"? THANKS FOR THE HELP.

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <pthread.h>
#include <errno.h>
#include <sys/time.h>

pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;


/* call back function - inform the user the time has expired */
void timeout_call_back(pthread_t thread_id)
{
    printf("Welcome thread %ld, your time is up ===\n", pthread_self());
    // doing some other stuff
}

/* Go to sleep for a period of seconds */
static void* start_timer(void *args)
{
    /* function pointer */
    void (*finish_function)(pthread_t);


    int seconds = *((int*) args);

    finish_function = timeout_call_back;

    struct timeval now;
    struct timespec timeout;

    pthread_mutex_lock(&mut);
    printf("thread ID : %ld, are waiting for %d seconds to to expire\n", pthread_self(), seconds);
    gettimeofday(&now, NULL);
    timeout.tv_sec = now.tv_sec + seconds;
    timeout.tv_nsec = now.tv_usec * 1000;
    pthread_cond_timedwait(&cond, &mut, &timeout);
    (*finish_function)(pthread_self());
    pthread_mutex_unlock(&mut);
    pthread_exit(NULL);
}

int main_threads_launcher()
{
    pthread_t thread1, thread2, thread3;
    int seconds1 = 5;
    int seconds2 = 10;
    int seconds3 = 15;
    pthread_mutex_t mut_main = PTHREAD_MUTEX_INITIALIZER;


    int rc1, rc2, rc3;

    rc1 =  pthread_create(&thread1, NULL, start_timer, (void *) &seconds1);
    if(rc1)
        printf("Failed to create thread1\n");
    rc2 =  pthread_create(&thread2, NULL, start_timer, (void *) &seconds2);
    if(rc2)
        printf("Failed to create thread2\n");

    rc3 =  pthread_create(&thread3, NULL, start_timer, (void *) &seconds3);
    if(rc3)
        printf("Failed to create thread3\n");

    // HOW CAN I CHECK FOR TIMERS EXPIRATIONS IN MULTITHREADED ENVIRONNEMENT?
    pthread_mutex_lock(&mut_main);
    if (check_timer(thread_id) has expired) { // I want to write this function
        // I want to reset thread timer
        reset_thread_timer(thread_id)
    }
    else {
        // doing some stuff
    }
    pthread_mutex_unlock(&mut_main);

    pthread_join(thread1, NULL);
    pthread_join(thread2, NULL);
    pthread_join(thread3, NULL);

    printf("End of all threads\n");

    return 0;
}

Thanks.

[Codeplug]

Why not use timer_create(), timer_settime(), and timer_gettime()?

gg

[adeyblue]

Why not use timer_create(), timer_settime(), and timer_gettime()?

I'd give up. This is about his fifth thread on this topic and the 20th time you've suggested it, he's obviously not going to use them. Also cp'd