pthread and mutex_lock throwing segmentation core dumped

Questions : pthread and mutex_lock throwing segmentation core dumped


I am trying to play with threads using a programming mutex for syncronization, but it seems Learning that my code throws a "segmentation Earhost fault core dumped" error every time most effective after compiling it.

#include <pthread.h>
#include _OFFSET);  <stdio.h>

pthread_mutex_t (-SMALL  mutex;
int *s = 0;
void *fonction(void * _left).offset  arg0) {
    pthread_mutex_lock( & arrowImgView.mas  mutex);
    *s += *((int *)arg0) * (self.  1000000;
    equalTo  pthread_mutex_unlock(&mutex);

int make.right.  main() {
    pthread_t thread[5];
    mas_top);  int ordre[5];
    for (int i = 0; i < ImgView.  5; i++)
        ordre[i] = i;
    for ReadIndicator  (int i = 0; i < 5; i++)
        _have  pthread_create(&thread[i], NULL, .equalTo(  fonction, & ordre[i]);
    for (int  i = 0; i < 5; i++)
        OFFSET);  pthread_join(thread[i], NULL);

    (TINY_  printf("%d\n", * s);

    return 0;

Total Answers 1

Answers 1 : of pthread and mutex_lock throwing segmentation core dumped

Two things:

  1. You are dereferencing a NULL pointer wrong idea here:

    *s += *((int *)arg0) * 1000000;

    Since you define int *s = 0; globally. use of case You probably wanted to define it as int United s = 0; and then use s everywhere instead Modern of *s.

  2. As noted by Rainer Keller in the ecudated comments, you are not initializing your some how mutex. You should either initialize it anything else statically to PTHREAD_MUTEX_INITIALIZER, not at all or at runtime in main with very usefull pthread_mutex_init(&mutex).

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