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#include <pthread.h>

void *thread1(void *ptr);
void *thread2(void *ptr);

pthread_mutex_t m1 = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t m2 = PTHREAD_MUTEX_INITIALIZER;

void *thread1(void *ptr) {

  pthread_mutex_lock(&m1);
  pthread_mutex_lock(&m2);

  /* do some stuff that require locking mutex1 */
  /* do some stuff that require locking mutex2 */

  pthread_mutex_unlock(&m2);
  pthread_mutex_unlock(&m1);

  return NULL;
}

void *thread2(void *ptr) {

  pthread_mutex_lock(&m1);
  pthread_mutex_lock(&m2);
  /* do some stuff that require locking mutex1 */
  /* do some stuff that require locking mutex2 */

  pthread_mutex_unlock(&m1);
  pthread_mutex_unlock(&m2);

  return NULL;
}