互斥锁使用范例

来源：互联网发布：win10装mac系统编辑：程序博客网时间：2024/06/05 09:02

#define OBSERVER "Observer"

#include <pthread.h>

#include "log.h"

#include "observer.h"

static GList* observers;

static pthread_mutexattr_t mutexattr;//创建互斥锁

static pthread_mutex_t mutex;

void

observer_init()

{

pthread_mutexattr_init(&mutexattr);

pthread_mutexattr_settype(&mutexattr, PTHREAD_MUTEX_RECURSIVE_NP);

//设置属性

pthread_mutex_init(&mutex, &mutexattr);//初始化互斥锁

log_debug(OBSERVER, "Observer module is initialized.");

}

void

observer_exit()

{

pthread_mutexattr_destroy(&mutexattr);

pthread_mutex_destroy(&mutex);//注销互斥锁

log_debug(OBSERVER, "Observer module exits.");

}

void

observer_register(OBSERVER_UPDATE update_func)

{

pthread_mutex_lock(&mutex);//加锁

observers = g_list_append(observers, update_func);

pthread_mutex_unlock(&mutex);//解锁

}

void

observer_notify(int module, int event, void* userdata)

{

int i;

int len;

OBSERVER_UPDATE update;

pthread_mutex_lock(&mutex);

len = g_list_length(observers);

for (i = 0; i < len; i++) {

update = (OBSERVER_UPDATE)g_list_nth_data(observers, i);

if (update == NULL) {

continue;

}

update(module, event, userdata);

}

pthread_mutex_unlock(&mutex);