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142 lines
4.4 KiB
142 lines
4.4 KiB
/*
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* $Id$
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*
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* Copyright (C) 2009 iptelorg GmbH
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* timer_proc.c - separate process timers
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* (unrelated to the main fast and slow timers)
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*/
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/*
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* History:
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* --------
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* 2009-03-10 initial version (andrei)
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*/
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/**
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* @file
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* @brief SIP-router core :: timer - separate process timers
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*
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* (unrelated to the main fast and slow timers)
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*
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* @ingroup core
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* Module: @ref core
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*/
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#include "timer_proc.h"
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#include "cfg/cfg_struct.h"
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#include "pt.h"
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#include "mem/shm_mem.h"
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#include <unistd.h>
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/** update internal counters for running new dummy timers
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* @param timers - number of dummy timer processes
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* @return - 0 on success; -1 on error
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*/
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int register_dummy_timers(int timers)
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{
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if(register_procs(timers)<0)
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return -1;
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cfg_register_child(timers);
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return 0;
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}
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/** forks a separate simple sleep() periodic timer.
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* Forks a very basic periodic timer process, that just sleep()s for
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* the specified interval and then calls the timer function.
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* The new "dummy timer" process execution start immediately, the sleep()
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* is called first (so the first call to the timer function will happen
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* <interval> seconds after the call to fork_dummy_timer)
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* @param child_id - @see fork_process()
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* @param desc - @see fork_process()
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* @param make_sock - @see fork_process()
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* @param f - timer function/callback
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* @param param - parameter passed to the timer function
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* @param interval - interval in seconds.
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* @return - pid of the new process on success, -1 on error
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* (doesn't return anything in the child process)
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*/
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int fork_dummy_timer(int child_id, char* desc, int make_sock,
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timer_function* f, void* param, int interval)
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{
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int pid;
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pid=fork_process(child_id, desc, make_sock);
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if (pid<0) return -1;
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if (pid==0){
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/* child */
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if (cfg_child_init()) return -1;
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for(;;){
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sleep(interval);
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cfg_update();
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f(get_ticks(), param); /* ticks in s for compatibility with old
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timers */
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}
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}
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/* parent */
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return pid;
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}
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/** forks a timer process based on the local timer.
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* Forks a separate timer process running a local_timer.h type of timer
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* A pointer to the local_timer handle (allocated in shared memory) is
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* returned in lt_h. It can be used to add/delete more timers at runtime
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* (via local_timer_add()/local_timer_del() a.s.o).
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* If timers are added from separate processes, some form of locking must be
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* used (all the calls to local_timer* must be enclosed by locks if it
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* cannot be guaranteed that they cannot execute in the same time)
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* The timer "engine" must be run manually from the child process. For
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* example a very simple local timer process that just runs a single
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* periodic timer can be started in the following way:
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* struct local_timer* lt_h;
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*
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* pid=fork_local_timer_process(...., <_h);
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* if (pid==0){
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* timer_init(&my_timer, my_timer_f, 0, 0);
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* local_timer_add(<_h, &my_timer, S_TO_TICKS(10), get_ticks_raw());
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* while(1) { sleep(1); local_timer_run(lt, get_ticks_raw()); }
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* }
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*
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* @param child_id - @see fork_process()
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* @param desc - @see fork_process()
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* @param make_sock - @see fork_process()
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* @param lt_h - local_timer handler
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* @return - pid to the parent, 0 to the child, -1 if error.
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*/
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int fork_local_timer_process(int child_id, char* desc, int make_sock,
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struct local_timer** lt_h)
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{
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int pid;
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struct local_timer* lt;
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lt=shm_malloc(sizeof(*lt));
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if (lt==0) goto error;
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if (init_local_timer(lt, get_ticks_raw())<0) goto error;
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pid=fork_process(child_id, desc, make_sock);
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if (pid<0) goto error;
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*lt_h=lt;
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return pid;
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error:
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if (lt) shm_free(lt);
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return -1;
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}
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/* vi: set ts=4 sw=4 tw=79:ai:cindent: */
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