core: get rid of rt sig/timer handling since modern Linux' ppooll() is finally fixed for granularity

This commit is contained in:
Lennart Poettering 2009-06-19 21:00:06 +02:00
parent a62db279b7
commit 32e2cd6d32
21 changed files with 4 additions and 372 deletions

View file

@ -30,10 +30,6 @@
#include <string.h>
#include <errno.h>
#ifdef __linux__
#include <sys/utsname.h>
#endif
#ifdef HAVE_POLL_H
#include <poll.h>
#else
@ -47,7 +43,6 @@
#include <pulsecore/rtclock.h>
#include <pulsecore/macro.h>
#include <pulsecore/llist.h>
#include <pulsecore/rtsig.h>
#include <pulsecore/flist.h>
#include <pulsecore/core-util.h>
#include <pulsecore/winsock.h>
@ -66,20 +61,9 @@ struct pa_rtpoll {
pa_bool_t scan_for_dead:1;
pa_bool_t running:1;
pa_bool_t installed:1;
pa_bool_t rebuild_needed:1;
pa_bool_t quit:1;
#ifdef HAVE_PPOLL
pa_bool_t timer_armed:1;
#ifdef __linux__
pa_bool_t dont_use_ppoll:1;
#endif
int rtsig;
sigset_t sigset_unblocked;
timer_t timer;
#endif
#ifdef DEBUG_TIMING
pa_usec_t timestamp;
pa_usec_t slept, awake;
@ -107,52 +91,20 @@ struct pa_rtpoll_item {
PA_STATIC_FLIST_DECLARE(items, 0, pa_xfree);
static void signal_handler_noop(int s) { /* write(2, "signal\n", 7); */ }
pa_rtpoll *pa_rtpoll_new(void) {
pa_rtpoll *p;
p = pa_xnew(pa_rtpoll, 1);
#ifdef HAVE_PPOLL
#ifdef __linux__
/* ppoll is broken on Linux < 2.6.16 */
p->dont_use_ppoll = FALSE;
{
struct utsname u;
unsigned major, minor, micro;
pa_assert_se(uname(&u) == 0);
if (sscanf(u.release, "%u.%u.%u", &major, &minor, &micro) != 3 ||
(major < 2) ||
(major == 2 && minor < 6) ||
(major == 2 && minor == 6 && micro < 16))
p->dont_use_ppoll = TRUE;
}
#endif
p->rtsig = -1;
sigemptyset(&p->sigset_unblocked);
p->timer = (timer_t) -1;
p->timer_armed = FALSE;
#endif
p->n_pollfd_alloc = 32;
p->pollfd = pa_xnew(struct pollfd, p->n_pollfd_alloc);
p->pollfd2 = pa_xnew(struct pollfd, p->n_pollfd_alloc);
p->n_pollfd_used = 0;
memset(&p->next_elapse, 0, sizeof(p->next_elapse));
pa_zero(p->next_elapse);
p->timer_enabled = FALSE;
p->running = FALSE;
p->installed = FALSE;
p->scan_for_dead = FALSE;
p->rebuild_needed = FALSE;
p->quit = FALSE;
@ -167,46 +119,6 @@ pa_rtpoll *pa_rtpoll_new(void) {
return p;
}
void pa_rtpoll_install(pa_rtpoll *p) {
pa_assert(p);
pa_assert(!p->installed);
p->installed = TRUE;
#ifdef HAVE_PPOLL
# ifdef __linux__
if (p->dont_use_ppoll)
return;
# endif
if ((p->rtsig = pa_rtsig_get_for_thread()) < 0) {
pa_log_warn("Failed to reserve POSIX realtime signal.");
return;
}
pa_log_debug("Acquired POSIX realtime signal %s", pa_sig2str(p->rtsig));
{
sigset_t ss;
struct sigaction sa;
pa_assert_se(sigemptyset(&ss) == 0);
pa_assert_se(sigaddset(&ss, p->rtsig) == 0);
pa_assert_se(pthread_sigmask(SIG_BLOCK, &ss, &p->sigset_unblocked) == 0);
pa_assert_se(sigdelset(&p->sigset_unblocked, p->rtsig) == 0);
memset(&sa, 0, sizeof(sa));
sa.sa_handler = signal_handler_noop;
pa_assert_se(sigemptyset(&sa.sa_mask) == 0);
pa_assert_se(sigaction(p->rtsig, &sa, NULL) == 0);
/* We never reset the signal handler. Why should we? */
}
#endif
}
static void rtpoll_rebuild(pa_rtpoll *p) {
struct pollfd *e, *t;
@ -250,7 +162,6 @@ static void rtpoll_rebuild(pa_rtpoll *p) {
if (ra)
p->pollfd2 = pa_xrealloc(p->pollfd2, p->n_pollfd_alloc * sizeof(struct pollfd));
}
static void rtpoll_item_destroy(pa_rtpoll_item *i) {
@ -279,11 +190,6 @@ void pa_rtpoll_free(pa_rtpoll *p) {
pa_xfree(p->pollfd);
pa_xfree(p->pollfd2);
#ifdef HAVE_PPOLL
if (p->timer != (timer_t) -1)
timer_delete(p->timer);
#endif
pa_xfree(p);
}
@ -321,7 +227,6 @@ int pa_rtpoll_run(pa_rtpoll *p, pa_bool_t wait) {
pa_assert(p);
pa_assert(!p->running);
pa_assert(p->installed);
p->running = TRUE;
@ -402,22 +307,15 @@ int pa_rtpoll_run(pa_rtpoll *p, pa_bool_t wait) {
/* OK, now let's sleep */
#ifdef HAVE_PPOLL
#ifdef __linux__
if (!p->dont_use_ppoll)
#endif
{
struct timespec ts;
ts.tv_sec = timeout.tv_sec;
ts.tv_nsec = timeout.tv_usec * 1000;
r = ppoll(p->pollfd, p->n_pollfd_used, (!wait || p->quit || p->timer_enabled) ? &ts : NULL, p->rtsig < 0 ? NULL : &p->sigset_unblocked);
r = ppoll(p->pollfd, p->n_pollfd_used, (!wait || p->quit || p->timer_enabled) ? &ts : NULL, NULL);
}
#ifdef __linux__
else
#endif
#endif
#else
r = poll(p->pollfd, p->n_pollfd_used, (!wait || p->quit || p->timer_enabled) ? (int) ((timeout.tv_sec*1000) + (timeout.tv_usec / 1000)) : -1);
#endif
#ifdef DEBUG_TIMING
{
@ -472,73 +370,11 @@ finish:
return r < 0 ? r : !p->quit;
}
static void update_timer(pa_rtpoll *p) {
pa_assert(p);
#ifdef HAVE_PPOLL
#ifdef __linux__
if (p->dont_use_ppoll)
return;
#endif
if (p->timer == (timer_t) -1) {
struct sigevent se;
memset(&se, 0, sizeof(se));
se.sigev_notify = SIGEV_SIGNAL;
se.sigev_signo = p->rtsig;
if (timer_create(CLOCK_MONOTONIC, &se, &p->timer) < 0)
if (timer_create(CLOCK_REALTIME, &se, &p->timer) < 0) {
pa_log_warn("Failed to allocate POSIX timer: %s", pa_cstrerror(errno));
p->timer = (timer_t) -1;
}
}
if (p->timer != (timer_t) -1) {
struct itimerspec its;
struct timespec ts = { .tv_sec = 0, .tv_nsec = 0 };
sigset_t ss;
if (p->timer_armed) {
/* First disarm timer */
memset(&its, 0, sizeof(its));
pa_assert_se(timer_settime(p->timer, TIMER_ABSTIME, &its, NULL) == 0);
/* Remove a signal that might be waiting in the signal q */
pa_assert_se(sigemptyset(&ss) == 0);
pa_assert_se(sigaddset(&ss, p->rtsig) == 0);
sigtimedwait(&ss, NULL, &ts);
}
/* And install the new timer */
if (p->timer_enabled) {
memset(&its, 0, sizeof(its));
its.it_value.tv_sec = p->next_elapse.tv_sec;
its.it_value.tv_nsec = p->next_elapse.tv_usec*1000;
/* Make sure that 0,0 is not understood as
* "disarming" */
if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0)
its.it_value.tv_nsec = 1;
pa_assert_se(timer_settime(p->timer, TIMER_ABSTIME, &its, NULL) == 0);
}
p->timer_armed = p->timer_enabled;
}
#endif
}
void pa_rtpoll_set_timer_absolute(pa_rtpoll *p, pa_usec_t usec) {
pa_assert(p);
pa_timeval_store(&p->next_elapse, usec);
p->timer_enabled = TRUE;
update_timer(p);
}
void pa_rtpoll_set_timer_relative(pa_rtpoll *p, pa_usec_t usec) {
@ -550,8 +386,6 @@ void pa_rtpoll_set_timer_relative(pa_rtpoll *p, pa_usec_t usec) {
pa_rtclock_get(&p->next_elapse);
pa_timeval_add(&p->next_elapse, usec);
p->timer_enabled = TRUE;
update_timer(p);
}
void pa_rtpoll_set_timer_disabled(pa_rtpoll *p) {
@ -559,8 +393,6 @@ void pa_rtpoll_set_timer_disabled(pa_rtpoll *p) {
memset(&p->next_elapse, 0, sizeof(p->next_elapse));
p->timer_enabled = FALSE;
update_timer(p);
}
pa_rtpoll_item *pa_rtpoll_item_new(pa_rtpoll *p, pa_rtpoll_priority_t prio, unsigned n_fds) {