c语言怎么使得线程2的返回值供线程3使用
时间: 2024-05-09 22:18:21 浏览: 14
可以使用pthread_join()函数来等待线程2执行完成,获取它的返回值,并将返回值传递给线程3。具体的代码实现可以参考下面的示例:
```
#include <stdio.h>
#include <pthread.h>
void *thread2(void *arg) {
int *p = (int*)arg;
int result = *p + 1;
pthread_exit((void*)&result);
}
void *thread3(void *arg) {
int *p = (int*)arg;
printf("Thread 3 received result: %d\n", *p);
pthread_exit(NULL);
}
int main() {
pthread_t tid2, tid3;
int arg2 = 1;
int *ret2;
// Create and start Thread 2
pthread_create(&tid2, NULL, thread2, (void*)&arg2);
// Wait for Thread 2 to complete and get its return value
pthread_join(tid2, (void**)&ret2);
// Create and start Thread 3 with Thread 2's return value as argument
pthread_create(&tid3, NULL, thread3, (void*)ret2);
// Wait for Thread 3 to complete
pthread_join(tid3, NULL);
return 0;
}
```
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