Created
November 20, 2009 08:37
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/** | |
* How to compile in linux : | |
* gcc -lrt posix_timer.c | |
* to link posix timer functions. | |
*/ | |
#include <stdio.h> | |
#include <time.h> | |
#include <signal.h> | |
#define SIGNO SIGUSR1 | |
#define THREAD_TIMER | |
#define USE_ABSTIMER | |
struct posix_timer { | |
struct itimerspec ts; | |
timer_t timer; | |
}; | |
int timer_flag; | |
#ifdef THREAD_TIMER | |
void timer_handler(union sigval v) | |
{ | |
struct posix_timer* pt; | |
pt = (struct posix_timer*) v.sival_ptr; | |
printf("[%s]sigval_int %p\n",__FUNCTION__,pt); | |
#ifdef USE_ABSTIMER | |
clock_gettime( CLOCK_REALTIME, &(pt->ts.it_value) ); | |
pt->ts.it_value.tv_sec += 1; | |
#endif | |
timer_settime(&pt->timer,timer_flag,&pt->ts,NULL); | |
} | |
#else | |
static void sigtimer_handler(int signo,siginfo_t *si,void *ucontext) | |
{ | |
struct posix_timer* pt; | |
pt = (struct posix_timer*) si->si_ptr; | |
printf("[%s]sigval_int %p\n",__FUNCTION__,pt); | |
#ifdef USE_ABSTIMER | |
clock_gettime( CLOCK_REALTIME, &(pt->ts.it_value) ); | |
pt->ts.it_value.tv_sec += 1; | |
#endif | |
timer_settime(&pt->timer,timer_flag,&pt->ts,NULL); | |
} | |
#endif | |
main() | |
{ | |
int ret; | |
struct sigevent evp; | |
struct posix_timer pt; | |
#ifdef THREAD_TIMER | |
evp.sigev_notify = SIGEV_THREAD; | |
evp.sigev_notify_function = timer_handler; | |
evp.sigev_value.sival_ptr = &pt; | |
evp.sigev_notify_attributes = NULL; | |
#else | |
struct sigaction act; | |
sigset_t set; | |
act.sa_sigaction = sigtimer_handler; | |
act.sa_flags |= SA_SIGINFO; | |
sigemptyset(&set); | |
sigaddset(&set,SIGNO); | |
sigprocmask(SIG_UNBLOCK,&set,NULL); | |
if( sigaction(SIGNO,&act,NULL) < 0 ){ | |
perror("sigaction"); | |
} | |
evp.sigev_notify = SIGEV_SIGNAL; | |
evp.sigev_signo = SIGNO; | |
evp.sigev_value.sival_ptr = &pt; | |
#endif // THREAD_TIMER | |
#ifdef USE_ABSTIMER | |
clock_gettime( CLOCK_REALTIME, &(pt.ts.it_value) ); | |
pt.ts.it_value.tv_sec += 1; | |
clock_gettime( CLOCK_REALTIME, &(pt.ts.it_interval) ); | |
pt.ts.it_value.tv_nsec += 2; // this program doesn't use this. | |
timer_flag = TIMER_ABSTIME; | |
#else | |
pt.ts.it_value.tv_sec = 1; | |
pt.ts.it_value.tv_nsec = 0; | |
pt.ts.it_interval.tv_nsec = 2; // this program doesn't use this. | |
pt.ts.it_interval.tv_nsec = 0; | |
timer_flag = 0; | |
#endif // USE_ABSTIMER | |
/* set timerid and evp */ | |
ret = timer_create(CLOCK_REALTIME,&evp,&pt.timer); | |
if ( ret < 0 ) | |
perror("timer_create"); | |
ret = timer_settime(pt.timer,timer_flag,&pt.ts,NULL); | |
if ( ret < 0 ) | |
perror("timer_settime"); | |
while(1){ | |
pause(); | |
} | |
} |
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