CODEWITHSUNDEEP
clinuxmultithreadingpthreads
Altroz
Altroz

Reputation: 31

Pthread create is not starting the thread

I’m using pthread to start a thread, but the create function itself is not starting the thread But instead if i call pthread join, it starts so actually should i call p thread join?

i heard from some answers that pthread join is not required , my pthread create function is called from main

    int main(void) {
    
        printf("-----------Welcome------\n");
    
        Start_Generation();
    
    
        return 0;
    }
    
   
    
    int Start_Generation(void)
    {
        
        ret=pthread_create(&C_AO_GENERATION_THREAD, NULL, C_Aogeneration_thread,(void*) message1);
        if(ret!=0)
        {
            printf("Error Starting Thread\n");
            return -1;
        }
        else
        {
            printf("AO Thread Started\n");
        }
        //ret=pthread_join(C_AO_GENERATION_THREAD, NULL);
        return 0;
    }
    void *C_Aogeneration_thread (void *ptr)
    {
        char *message;
        message = (char *) ptr;
        unsigned int prof_gen_count;
        unsigned int written_sample=0;
        unsigned int curr_idx=0;
        int ch=0;
        int written=0;
        printf("%s",message);
        printf(" Generation Started\n");
        prof_gen_count=(samplingrate/10);
        
while(stopflag)
{
printf("Thread is working\n");
}
    
        return 0;
    }

    enter code here

Upvotes: 0

Views: 1378

Answers (1)

John Bollinger
John Bollinger

Reputation: 181339

I’m using pthread to start a thread, but the create function itself is not starting the thread

As presented in the question, your main thread terminates by returning from main immediately after reporting on the success or failure of the pthread_create() call, so

  1. the whole program terminates at that point, apparently before the child progresses far enough to present any evidence that it is running, but also

  2. there is no point in using a separate thread.

But instead if i call pthread join, it starts so actually should i call p thread join?

A call to pthread_join() does not return successfully until the specified thread has terminated. That is, in fact, its purpose. As a rule of thumb, you should either join or detach every thread you create. Joining is usually what you want, and note, too, that detaching a thread does not prevent the process from terminating and taking that thread with it when the main thread returns or exit()s.

Upvotes: 3

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