It seems do not pass auguments

[zhshqzyc]

It is a dining philosopher problem.
I used mutual exclusion. No compile error, but it does not work.
I try to print "test" in the route "philosopher",howerver....
Could you help me check what is wrong?

#include <stdio.h>
#include <pthread.h>
#include <malloc.h>
#include <stdlib.h>
#include <time.h>
#define N 5

struct da {
    int id;
};
struct da myda[N];

  pthread_mutex_t  *mymutex;

void think (int i) {
	printf ("\nPhilosopher no. %d is thinking...\n", i);
                sleep(2);
}

void eat (int i) {
	printf ("\nPhilosopher no. %d is eating...\n", i);
	sleep(1);
}

void *philosopher (void *arg)
{
      int i;
      struct da *mydata;
      mydata = (struct da *) arg; 
      i = mydata->id;
          printf("test");//does not execute!
              printf("\nPhilosopher %d\n",i);
              think(i);
              if (i%2 == 1) {
              pthread_mutex_lock(&mymutex[i+1]);    
              pthread_mutex_lock(&mymutex[i]);
              eat(i);
              pthread_mutex_unlock(&mymutex[i]);   
              pthread_mutex_unlock(&mymutex[i+1]); 
           }
              else
              { 
                   if  (i == 4) {
                   pthread_mutex_lock(&mymutex[i]);
                   pthread_mutex_lock(&mymutex[0]);
                   eat(i);
                   pthread_mutex_unlock(&mymutex[0]);
                   pthread_mutex_unlock(&mymutex[i]);
                   }              
                 {
              pthread_mutex_lock(&mymutex[i]);     
              pthread_mutex_lock(&mymutex[i+1]); 
              eat(i);
              pthread_mutex_unlock(&mymutex[i+1]);  
              pthread_mutex_unlock(&mymutex[i]); 
                 }
              }
              pthread_exit(NULL);
}
   
void main (int argc, char*argv[]) {
        pthread_t threads[N]; 
        int rc, i;
        
        int *id[N];
        
        /*pthread_t threads[N];*/
        mymutex = (pthread_mutex_t*)malloc(sizeof(mymutex) * N);
        printf("\nThere are %d philosophers\n", N);
       
        for (i = 0; i<N; i++) {  
             	pthread_mutex_init(&mymutex[i], NULL);   
             }    
        for (i = 0; i<N; i++) {
        myda[i].id = i;
  rc = pthread_create(&threads[i], NULL, philosopher,(void *)&myda[i]);
        if (rc) {
           printf("ERROR;return code from pthread_create() is %d\n",rc);
           exit(-1);
          }
	}
        for (i = 0; i<N; i++) {
           pthread_mutex_destroy(&mymutex[i]);
        } 
}

[SlyMaelstrom]

I've never heard of pthread.h so I can't compile. I don't think it's standard.

Just by looking at it, I couldn't tell you why that wouldn't print. Are you sure it's entering the function? Does it print the next output line right below it?

[bithub]

I've never heard of pthread.h so I can't compile. I don't think it's standard.

It's the POSIX threading library.

The code isnt executing because your main() thread is ending. Try calling pthread_join() on the created thread.