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Mutex Threads with C

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These are the basic commands to use Mutex Threads in C

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  1. #include <pthread.h>
  2.  
  3.     //this is our lock and we use it to lock and unlock our mutex when shared data is accessed.
  4.     pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER
  5.  
  6.     //the signature of the thread function always looks like this.
  7.     void* thread_function(void* arg)
  8.     {
  9.  
  10.     //before accessing the shared resource
  11.  
  12.     pthread_mutex_lock(&lock);
  13.  
  14.     //do something access your shared resource
  15.  
  16.     pthread_mutex_unlock(&lock);
  17.  
  18.     pthread_exit(NULL);
  19.  
  20.     }
  21.  
  22.     //creating and calling threads
  23.  
  24.     int main()
  25.     {
  26.  
  27.     pthread_t threads[3];
  28.     pthread_create(threads[0], NULL, &thread_function, void *arg);
  29.     pthread_create(threads[1], NULL, &thread_function, void *arg);
  30.     pthread_create(threads[2], NULL, &thread_function, void *arg);
  31.  
  32.     //join the threads, join call waits for all threads to finish
  33.     int i;
  34.  
  35.     for(i = 0; i < 3; i++)
  36.     {
  37.     pthread_join(threads[i], NULL);
  38.     }
  39.  
  40.     //after you are finish you should always destroy the thread
  41.     pthread_mutex_destory(&lock);
  42.  
  43.     }

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