deadlock.c
· 1.2 KiB · C
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// gcc -g ./s.c -o deadlock_demo -lpthread
// sudo valgrind --tool=helgrind ./deadlock_demo
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
pthread_mutex_t lock_a = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t lock_b = PTHREAD_MUTEX_INITIALIZER;
int shared_data = 0;
void* thread_func1(void* arg) {
pthread_mutex_lock(&lock_a);
printf("Thread 1 acquired lock A\n");
shared_data += 1; // 写入共享数据
sleep(1);
pthread_mutex_lock(&lock_b);
printf("Thread 1 acquired lock B\n");
shared_data += 1;
pthread_mutex_unlock(&lock_b);
pthread_mutex_unlock(&lock_a);
return NULL;
}
void* thread_func2(void* arg) {
pthread_mutex_lock(&lock_b);
printf("Thread 2 acquired lock B\n");
shared_data += 1;
sleep(1);
pthread_mutex_lock(&lock_a);
printf("Thread 2 acquired lock A\n");
shared_data += 1;
pthread_mutex_unlock(&lock_a);
pthread_mutex_unlock(&lock_b);
return NULL;
}
int main() {
pthread_t t1, t2;
pthread_create(&t1, NULL, thread_func1, NULL);
pthread_create(&t2, NULL, thread_func2, NULL);
pthread_join(t1, NULL);
pthread_join(t2, NULL);
printf("Done.\n");
return 0;
}
| 1 | // gcc -g ./s.c -o deadlock_demo -lpthread |
| 2 | // sudo valgrind --tool=helgrind ./deadlock_demo |
| 3 | |
| 4 | #include <pthread.h> |
| 5 | #include <stdio.h> |
| 6 | #include <unistd.h> |
| 7 | |
| 8 | pthread_mutex_t lock_a = PTHREAD_MUTEX_INITIALIZER; |
| 9 | pthread_mutex_t lock_b = PTHREAD_MUTEX_INITIALIZER; |
| 10 | |
| 11 | int shared_data = 0; |
| 12 | |
| 13 | void* thread_func1(void* arg) { |
| 14 | pthread_mutex_lock(&lock_a); |
| 15 | printf("Thread 1 acquired lock A\n"); |
| 16 | shared_data += 1; // 写入共享数据 |
| 17 | sleep(1); |
| 18 | pthread_mutex_lock(&lock_b); |
| 19 | printf("Thread 1 acquired lock B\n"); |
| 20 | shared_data += 1; |
| 21 | |
| 22 | pthread_mutex_unlock(&lock_b); |
| 23 | pthread_mutex_unlock(&lock_a); |
| 24 | return NULL; |
| 25 | } |
| 26 | |
| 27 | void* thread_func2(void* arg) { |
| 28 | pthread_mutex_lock(&lock_b); |
| 29 | printf("Thread 2 acquired lock B\n"); |
| 30 | shared_data += 1; |
| 31 | sleep(1); |
| 32 | pthread_mutex_lock(&lock_a); |
| 33 | printf("Thread 2 acquired lock A\n"); |
| 34 | shared_data += 1; |
| 35 | |
| 36 | pthread_mutex_unlock(&lock_a); |
| 37 | pthread_mutex_unlock(&lock_b); |
| 38 | return NULL; |
| 39 | } |
| 40 | |
| 41 | |
| 42 | int main() { |
| 43 | pthread_t t1, t2; |
| 44 | |
| 45 | pthread_create(&t1, NULL, thread_func1, NULL); |
| 46 | pthread_create(&t2, NULL, thread_func2, NULL); |
| 47 | |
| 48 | pthread_join(t1, NULL); |
| 49 | pthread_join(t2, NULL); |
| 50 | |
| 51 | printf("Done.\n"); |
| 52 | return 0; |
| 53 | } |
| 54 |