pjsip学习 ------ 三

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这次我们来说一下pjsip中的定时器timer.

pjsip中的定时器来自于ACE库。（ The timer scheduling implementation here is based on ACE library's

ACE_Timer_Heap, with only little modification to suit our library's style ） http://www.cs.wustl.edu/~schmidt/ACE.html

如何使用

1. 创建timer

pj_timer_heap_t *timer ;

pj_timer_heap_create(pool , 1 , &timer ) ;

2. 设置entry 及回调函数。

pj_timer_entry *entry ;

static void timer_callback(pj_timer_heap_t *ht , pj_timer_entry *en)
{

PJ_LOG(3 , ("timer" , "timercallback")) ;
}

entry = (pj_timer_entry*)pj_pool_calloc(pool , 1 , sizeof(*entry)) ;

entry->cb = &timer_callback ;

3.启动定时器。

pj_time_val delay ;

delay.sec = 1 ;
delay.msec = 0 ;
pj_timer_heap_schedule(timer , &entry, &delay) ;

4. 当然你需要不停的去poll这个timer（和ioqueue一样）.

另起一个线程

while(!quit_flag)
{

pj_timer_heap_poll(timer , NULL ) ;

PJ_LOG(3,("test" , "printf")) ;
}

#include "pjlib.h"pj_timer_heap_t  *timer ;int  quit_flag = 0 ;static  void timer_callback(pj_timer_heap_t *ht , pj_timer_entry *en){pj_time_val  delay ;PJ_LOG(3 , ("timer" , "timercallback")) ;delay.sec = 1 ;    delay.msec = 0 ;    pj_timer_heap_schedule(ht , en , &delay) ;}  static  int  main_thread_fun(void *arg){while(!quit_flag){pj_time_val  timeout = {0 , 500 };pj_timer_heap_poll(timer , NULL ) ;PJ_LOG(3,("test" , "printf")) ;}return 0 ;}int main(){pj_status_t  status ;pj_caching_pool  cp ;pj_pool_t       *pool ;pj_timer_entry   *entry ;pj_time_val     delay ;pj_thread_t   * thread ;status = pj_init();pj_caching_pool_init(&cp , NULL , 0 ) ;pool = pj_pool_create(&cp.factory , NULL , 512 , 512 , NULL ) ;entry = (pj_timer_entry*)pj_pool_calloc(pool , 1 , sizeof(*entry)) ;status = pj_timer_heap_create(pool , 1 , &timer ) ;entry[0].cb = &timer_callback ;delay.sec = 1 ;delay.msec = 0 ;pj_timer_heap_schedule(timer , &entry[0] , &delay) ;pj_thread_create(pool , NULL , main_thread_fun , NULL , 0 , 0 , &thread) ;while(!quit_flag){pj_thread_sleep(1000) ;}pj_shutdown();return 0 ;}