pthread_create后子线程输出了两次

#include
#include
#include
#include
#include

void *start_handler(void *);

int main(void)
{
pthread_t tid;
int err;

    if(err = pthread_create(&tid, NULL, start_handler, NULL))
    {
            fprintf(stderr, "Create thread: %s\n", strerror(err));
            return -1;
    }

    printf("OK\n");

    return 0;

}

void *start_handler(void *arg)
{
int err;

    if(err = pthread_detach(pthread_self()))
    {
            fprintf(stderr, "Detach thread: %s\n", strerror(err));
            pthread_exit((void *)-1);
    }

    printf("Start!\n");

    pthread_exit((void *)1);

}

1个回答

输出了两次是什么?线程函数执行了,然后输出?

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template <typename T> void *threadPool<T>::worker(void *s) { auto pool=static_cast<threadPool<T>*>(s); while (pool->run) { pthread_mutex_lock(&(pool->t)); if (pool->tasks.empty()) { pthread_mutex_unlock(&(pool->t)); printf("%d get the lock but continue.\n",pthread_self()); continue; } auto work = pool->tasks.front(); pool->tasks.pop(); printf("%d get the lock and print\n",pthread_self()); pthread_mutex_unlock(&(pool->t)); work->process(); } return nullptr; } #endif //!THREAD_POOL_H ``` ``` #include "thread_pool.h" void sample::process() { std::cout<<"hello world.\n"<<std::endl; } ``` ``` #include "thread_pool.h" #include <iostream> int main(int argc, char **argv) { threadPool<sample> pool; sample d[100]; for(int i=0;i<100;++i) { pool.append(d[i]); } return 0; } ``` ``` 1268307712 get the lock but continue. 1268307712 get the lock but continue. 1268307712 get the lock but continue. 1268307712 get the lock but continue. 1268307712 get the lock but continue. 1268307712 get the lock but continue. 1268307712 get the lock but continue. 1268307712 get the lock but continue. 1268307712 get the lock but continue. 1268307712 get the lock but continue. 1268307712 get the lock but continue. 1268307712 get the lock but continue. 1268307712 get the lock but continue. 1268307712 get the lock but continue. 1268307712 get the lock but continue. 1268307712 get the lock but continue. 1285158720 append. 1268307712 get the lock and print 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1243129600 get the lock but continue. 1259915008 get the lock but continue. 1251522304 get the lock but continue. hello world. 1285158720 append. 1268307712 get the lock and print hello world. 1268307712 get the lock but continue. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1251522304 get the lock and print hello world. 1251522304 get the lock and print hello world. 1259915008 get the lock and print 1243129600 get the lock and print hello world. 1243129600 get the lock and print hello world. 1243129600 get the lock and print hello world. 1243129600 get the lock and print hello world. 1243129600 get the lock and print hello world. 1285158720 append. 1251522304 get the lock and print hello world. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1285158720 append. 1234736896 get the lock and print hello world. 1259915008 get the lock and print hello world. 1259915008 get the lock and print hello world. 1259915008 get the lock and print hello world. hello world. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1251522304 get the lock and print hello world. 1251522304 get the lock and print hello world. 1251522304 get the lock and print hello world. 1251522304 get the lock and print hello world. 1251522304 get the lock and print hello world. 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1251522304 get the lock but continue. 1268307712 get the lock but continue. 1259915008 get the lock but continue. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1234736896 get the lock and print hello world. 1234736896 get the lock and print hello world. 1243129600 get the lock and print hello world. 1243129600 get the lock and print hello world. 1243129600 get the lock and print hello world. 1243129600 get the lock and print hello world. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1243129600 get the lock but continue. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. 1285158720 append. ``` **头晕了一下午,麻烦大佬出来解救众生。**

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