linux 硬死锁 软死锁

#include <stdio.h>
#include <pthread.h>

pthread_mutex_t resource1 = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t resource2 = PTHREAD_MUTEX_INITIALIZER;

void* thread1(void* arg) {
    pthread_mutex_lock(&resource1);
    printf("Thread 1: locked resource 1
");
    pthread_mutex_lock(&resource2);
    printf("Thread 1: locked resource 2
");
    pthread_mutex_unlock(&resource2);
    pthread_mutex_unlock(&resource1);
    return NULL;
}

void* thread2(void* arg) {
    // Avoid deadlock by locking resources in the same order as thread1
    pthread_mutex_lock(&resource1);
    printf("Thread 2: locked resource 1
");
    pthread_mutex_lock(&resource2);
    printf("Thread 2: locked resource 2
");
    pthread_mutex_unlock(&resource2);
    pthread_mutex_unlock(&resource1);
    return NULL;
}

int main() {
    pthread_t t1, t2;
    pthread_create(&t1, NULL, thread1, NULL);
    pthread_create(&t2, NULL, thread2, NULL);
    pthread_join(t1, NULL);
    pthread_join(t2, NULL);
    return 0;
}