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/* Copyright (c) 2002-2025. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
/* Code with both recursive and non-recursive mutexes */
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
// Structure to hold the mutex's name and pointer to the actual mutex
typedef struct {
const char* name;
pthread_mutex_t* mutex;
} ThreadData;
static void* thread_function(void* arg)
{
ThreadData* data = (ThreadData*)arg;
pthread_mutex_t* mutex = data->mutex;
const char* name = data->name;
pthread_mutex_lock(mutex);
fprintf(stderr, "Got the lock on the %s mutex.\n", name);
// Attempt to relock the mutex - This behavior depends on the mutex type
if (pthread_mutex_trylock(mutex) == 0) {
fprintf(stderr, "Got the lock again on the %s mutex.\n", name);
pthread_mutex_unlock(mutex);
} else {
fprintf(stderr, "Failed to relock the %s mutex.\n", name);
}
pthread_mutex_unlock(mutex);
// pthread_exit(NULL); TODO: segfaulting
return NULL;
}
int main()
{
pthread_t thread1;
pthread_t thread2;
pthread_mutex_t mutex_dflt = PTHREAD_MUTEX_INITIALIZER; // Non-recursive mutex
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_t mutex_rec;
pthread_mutex_init(&mutex_rec, &attr);
ThreadData data1 = {"default", &mutex_dflt};
ThreadData data2 = {"recursive", &mutex_rec};
pthread_create(&thread1, NULL, thread_function, &data1);
pthread_create(&thread2, NULL, thread_function, &data2);
pthread_join(thread1, NULL);
pthread_join(thread2, NULL);
pthread_mutex_destroy(&mutex_dflt);
pthread_mutex_destroy(&mutex_rec);
return 0;
}
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