141 lines
4.2 KiB
C
141 lines
4.2 KiB
C
/**
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* @file timer.c
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @section DESCRIPTION
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*
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* Synopsis:
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* periodic_timer(string down_time, string up_time)
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*
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* Description:
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* Periodically goes up and down. Starting in the down state, waits 'down_time'
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* milliseconds. Then it goes up, and after 'up_time' milliseconds, goes back down,
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* and the process repeats. When requested to terminate, terminates immedietely.
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*/
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#include <stddef.h>
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#include <misc/debug.h>
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#include <ncd/module_common.h>
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#include <generated/blog_channel_ncd_timer.h>
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#define STATE_DOWN 1
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#define STATE_UP 2
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struct instance {
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NCDModuleInst *i;
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btime_t down_time;
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btime_t up_time;
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BTimer timer;
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int state;
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};
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static void timer_handler (void *vo)
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{
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struct instance *o = vo;
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switch (o->state) {
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case STATE_DOWN: {
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o->state = STATE_UP;
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BReactor_SetTimerAfter(o->i->params->iparams->reactor, &o->timer, o->up_time);
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NCDModuleInst_Backend_Up(o->i);
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} break;
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case STATE_UP: {
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o->state = STATE_DOWN;
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BReactor_SetTimerAfter(o->i->params->iparams->reactor, &o->timer, o->down_time);
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NCDModuleInst_Backend_Down(o->i);
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} break;
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default: ASSERT(0);
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}
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}
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static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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struct instance *o = vo;
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o->i = i;
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// check arguments
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NCDValRef down_time_arg;
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NCDValRef up_time_arg;
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if (!NCDVal_ListRead(params->args, 2, &down_time_arg, &up_time_arg)) {
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ModuleLog(o->i, BLOG_ERROR, "wrong arity");
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goto fail0;
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}
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// read times
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if (!ncd_read_time(down_time_arg, &o->down_time)) {
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ModuleLog(o->i, BLOG_ERROR, "wrong down time");
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goto fail0;
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}
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if (!ncd_read_time(up_time_arg, &o->up_time)) {
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ModuleLog(o->i, BLOG_ERROR, "wrong up time");
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goto fail0;
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}
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// init timer
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BTimer_Init(&o->timer, 0, timer_handler, o);
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// set state down
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o->state = STATE_DOWN;
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// set timer
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BReactor_SetTimerAfter(o->i->params->iparams->reactor, &o->timer, o->down_time);
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return;
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fail0:
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NCDModuleInst_Backend_DeadError(i);
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}
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static void func_die (void *vo)
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{
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struct instance *o = vo;
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// free timer
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BReactor_RemoveTimer(o->i->params->iparams->reactor, &o->timer);
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NCDModuleInst_Backend_Dead(o->i);
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}
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static struct NCDModule modules[] = {
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{
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.type = "periodic_timer",
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.func_new2 = func_new,
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.func_die = func_die,
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.alloc_size = sizeof(struct instance)
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}, {
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.type = NULL
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}
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};
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const struct NCDModuleGroup ncdmodule_timer = {
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.modules = modules
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};
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