oRTP分析

oRTP分析

接口ortp_scheduler_init对调度模块进行初始化

/** *  Initialize the oRTP scheduler. You only have to do that if you intend to use the *  scheduled mode of the #RtpSession in your application.**/void ortp_scheduler_init(){    static bool_t initialized=FALSE;    if (initialized) return;    initialized=TRUE;#ifdef __hpux    /* on hpux, we must block sigalrm on the main process, because signal delivery    is ?random?, well, sometimes the SIGALRM goes to both the main thread and the    scheduler thread */    sigset_t set;    sigemptyset(&set);    sigaddset(&set,SIGALRM);    sigprocmask(SIG_BLOCK,&set,NULL);#endif /* __hpux */    __ortp_scheduler=rtp_scheduler_new();    rtp_scheduler_start(__ortp_scheduler);}

struct _RtpScheduler {    RtpSession *list;   /* list of scheduled sessions*/    SessionSet  all_sessions;  /* mask of scheduled sessions */    int     all_max;        /* the highest pos in the all mask */    SessionSet  r_sessions;     /* mask of sessions that have a recv event */    int     r_max;    SessionSet  w_sessions;     /* mask of sessions that have a send event */    int         w_max;    SessionSet  e_sessions; /* mask of session that have error event */    int     e_max;    int max_sessions;       /* the number of position in the masks */  /* GMutex  *unblock_select_mutex; */    ortp_cond_t   unblock_select_cond;    ortp_mutex_t    lock;    ortp_thread_t thread;    int thread_running;    struct _RtpTimer *timer;    uint32_t time_;       /*number of miliseconds elapsed since the start of the thread */    uint32_t timer_inc; /* the timer increment in milisec */};typedef struct _RtpScheduler RtpScheduler;

在该接口中创建一个RtpScheduler类型的结构体__ortp_scheduler，并调用rtp_scheduler_init初始化它。

初始化完后调用rtp_scheduler_start启动调度任务

调度任务的执行体为rtp_scheduler_schedule，参数为调度结构体自身