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Code Issues Releases Wiki Activity

use timerfd instead of timer objects to simplify code

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This commit is contained in:
Steffen Vogel 2015-05-06 12:05:07 +02:00
parent 9e0153f0f8
commit 90db947fa4
1 changed files with 22 additions and 43 deletions
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65
server/src/random.c
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@ -8,31 +8,15 @@
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <time.h>
#include <math.h>
#include <sys/timerfd.h>
#include "config.h"
#include "utils.h"
#include "msg.h"
#define CLOCKID CLOCK_REALTIME
#define SIG SIGRTMIN
void tick(int sig, siginfo_t *si, void *ptr)
{
struct msg *m = (struct msg *) si->si_value.sival_ptr;
msg_random(m);
msg_fprint(stdout, m);
fflush(stdout);
m->sequence++;
}
int main(int argc, char *argv[])
{
@ -49,44 +33,39 @@ int main(int argc, char *argv[])
exit(EXIT_FAILURE);
}
uint64_t runs;
int rate = atoi(argv[2]);
struct msg m = MSG_INIT(atoi(argv[1]));
/* Setup signals */
struct sigaction sa_tick = {
.sa_flags = SA_SIGINFO,
.sa_sigaction = tick
};
sigemptyset(&sa_tick.sa_mask);
sigaction(SIG, &sa_tick, NULL);
/* Setup timer */
timer_t t;
struct sigevent sev = {
.sigev_notify = SIGEV_SIGNAL,
.sigev_signo = SIG,
.sigev_value.sival_ptr = &m
};
double period = 1.0 / rate;
long sec = floor(period);
long nsec = (period - sec) * 1000000000;
struct itimerspec its = {
.it_interval = { sec, nsec },
.it_value = { 0, 1 }
.it_interval = timespec_rate(rate),
.it_value = { 1, 0 }
};
int tfd = timerfd_create(CLOCK_REALTIME, 0);
if (tfd < 0)
serror("Failed to create timer");
if (timerfd_settime(tfd, 0, &its, NULL))
serror("Failed to start timer");
/* Print header */
fprintf(stderr, "# %-6s%-12s\n", "seq", "data");
timer_create(CLOCKID, &sev, &t);
timer_settime(t, 0, &its, NULL);
while (1) {
/* Block until 1/p->rate seconds elapsed */
read(tfd, &runs, sizeof(runs));
msg_random(&m);
msg_fprint(stdout, &m);
fflush(stdout);
while (1) pause();
m.sequence++;
}
timer_delete(t);
close(tfd);
return 0;
}