linux C线程

线程

头文件

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#include <pthread.h>

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创建一个线程

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extern int pthreacreated_create (pthread_t *__restrict __newthread,
           const pthread_attr_t *__restrict __attr,
           void *(*__start_routine) (void *),
           void *__restrict __arg) __THROWNL __nonnull ((1, 3));

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参数

• 线程ID的指针

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pthread_t *__restrict __newthread,

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//  创建方式
pthread_t work_thread;
pthread_t wait_thread;

• 线程属性设置

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const pthread_attr_t *__restrict __attr,

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//  创建属性
pthread_attr_t attr;       //线程属性设置
pthread_attr_init(&attr);
//将属性设置为joinable, 使主线程等待该线程执行完后，再结束主线程
pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_JOINABLE);   

• 执行的线程函数 & 参数

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//  函数参数
void *__restrict __arg) __THROWNL __nonnull ((1, 3));

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//  创建传递线程参数的结构体
struct thread_para
{
    int sockfd;
    char *info;
};

thread_para thread_p;

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//  函数指针
void *(*__start_routine) (void *),

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//  创建线程函数
void *work_recv_thread(void *param)
{
    //  将传入的结构体强转类型
    thread_para *t_para = (thread_para* )param;
    ... ...
}

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• 创建线程

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extern int pthread_create (pthread_t *__restrict __newthread,
           const pthread_attr_t *__restrict __attr,
           void *(*__start_routine) (void *),
           void *__restrict __arg) __THROWNL __nonnull ((1, 3));

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创建一个线程
pthread_create(
    &work_thread,
    NULL,
    work_recv_thread,
    (void *)&thread_p);

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• 阻塞式(等待子线程运行完再结束主线程)

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extern int pthread_join (pthread_t __th, void **__thread_return);

pthread_t __th  //  线程ID
void **__thread_return  //  返回的线程状态信息，类型为void*

//ex:
void *status;
pthread_join(
    wait_thread,
    &status
);