ISC_TIMERFUNC_SCOPE void
isc__timermgr_destroy(isc_timermgr_t **managerp) {
isc__timermgr_t *manager;
isc_mem_t *mctx;
/*
* Destroy a timer manager.
*/
REQUIRE(managerp != NULL);
manager = (isc__timermgr_t *)*managerp;
REQUIRE(VALID_MANAGER(manager));
LOCK(&manager->lock);
#ifdef USE_SHARED_MANAGER
manager->refs--;
if (manager->refs > 0) {
UNLOCK(&manager->lock);
*managerp = NULL;
return;
}
timermgr = NULL;
#endif /* USE_SHARED_MANAGER */
#ifndef USE_TIMER_THREAD
isc__timermgr_dispatch((isc_timermgr_t *)manager);
#endif
REQUIRE(EMPTY(manager->timers));
manager->done = ISC_TRUE;
#ifdef USE_TIMER_THREAD
XTRACE(isc_msgcat_get(isc_msgcat, ISC_MSGSET_TIMER,
ISC_MSG_SIGNALDESTROY, "signal (destroy)"));
SIGNAL(&manager->wakeup);
#endif /* USE_TIMER_THREAD */
UNLOCK(&manager->lock);
#ifdef USE_TIMER_THREAD
/*
* Wait for thread to exit.
*/
if (isc_thread_join(manager->thread, NULL) != ISC_R_SUCCESS)
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_thread_join() %s",
isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
ISC_MSG_FAILED, "failed"));
#endif /* USE_TIMER_THREAD */
/*
* Clean up.
*/
#ifdef USE_TIMER_THREAD
(void)isc_condition_destroy(&manager->wakeup);
#endif /* USE_TIMER_THREAD */
DESTROYLOCK(&manager->lock);
isc_heap_destroy(&manager->heap);
manager->common.impmagic = 0;
manager->common.magic = 0;
mctx = manager->mctx;
isc_mem_put(mctx, manager, sizeof(*manager));
isc_mem_detach(&mctx);
*managerp = NULL;
#ifdef USE_SHARED_MANAGER
timermgr = NULL;
#endif
}
/*!
* Event loop for nonthreaded programs.
*/
static isc_result_t
evloop() {
isc_result_t result;
while (!want_shutdown) {
int n;
isc_time_t when, now;
struct timeval tv, *tvp;
fd_set *readfds, *writefds;
int maxfd;
isc_boolean_t readytasks;
isc_boolean_t call_timer_dispatch = ISC_FALSE;
readytasks = isc__taskmgr_ready();
if (readytasks) {
tv.tv_sec = 0;
tv.tv_usec = 0;
tvp = &tv;
call_timer_dispatch = ISC_TRUE;
} else {
result = isc__timermgr_nextevent(&when);
if (result != ISC_R_SUCCESS)
tvp = NULL;
else {
isc_uint64_t us;
TIME_NOW(&now);
us = isc_time_microdiff(&when, &now);
if (us == 0)
call_timer_dispatch = ISC_TRUE;
tv.tv_sec = us / 1000000;
tv.tv_usec = us % 1000000;
tvp = &tv;
}
}
isc__socketmgr_getfdsets(&readfds, &writefds, &maxfd);
n = select(maxfd, readfds, writefds, NULL, tvp);
if (n == 0 || call_timer_dispatch) {
/*
* We call isc__timermgr_dispatch() only when
* necessary, in order to reduce overhead. If the
* select() call indicates a timeout, we need the
* dispatch. Even if not, if we set the 0-timeout
* for the select() call, we need to check the timer
* events. In the 'readytasks' case, there may be no
* timeout event actually, but there is no other way
* to reduce the overhead.
* Note that we do not have to worry about the case
* where a new timer is inserted during the select()
* call, since this loop only runs in the non-thread
* mode.
*/
isc__timermgr_dispatch();
}
if (n > 0)
(void)isc__socketmgr_dispatch(readfds, writefds,
maxfd);
(void)isc__taskmgr_dispatch();
if (want_reload) {
want_reload = ISC_FALSE;
return (ISC_R_RELOAD);
}
}
return (ISC_R_SUCCESS);
}
/*!
* Event loop for nonthreaded programs.
*/
static isc_result_t
evloop(isc__appctx_t *ctx) {
isc_result_t result;
while (!ctx->want_shutdown) {
int n;
isc_time_t when, now;
struct timeval tv, *tvp;
isc_socketwait_t *swait;
isc_boolean_t readytasks;
isc_boolean_t call_timer_dispatch = ISC_FALSE;
/*
* Check the reload (or suspend) case first for exiting the
* loop as fast as possible in case:
* - the direct call to isc__taskmgr_dispatch() in
* isc__app_ctxrun() completes all the tasks so far,
* - there is thus currently no active task, and
* - there is a timer event
*/
if (ctx->want_reload) {
ctx->want_reload = ISC_FALSE;
return (ISC_R_RELOAD);
}
readytasks = isc__taskmgr_ready(ctx->taskmgr);
if (readytasks) {
tv.tv_sec = 0;
tv.tv_usec = 0;
tvp = &tv;
call_timer_dispatch = ISC_TRUE;
} else {
result = isc__timermgr_nextevent(ctx->timermgr, &when);
if (result != ISC_R_SUCCESS)
tvp = NULL;
else {
isc_uint64_t us;
TIME_NOW(&now);
us = isc_time_microdiff(&when, &now);
if (us == 0)
call_timer_dispatch = ISC_TRUE;
tv.tv_sec = us / 1000000;
tv.tv_usec = us % 1000000;
tvp = &tv;
}
}
swait = NULL;
n = isc__socketmgr_waitevents(ctx->socketmgr, tvp, &swait);
if (n == 0 || call_timer_dispatch) {
/*
* We call isc__timermgr_dispatch() only when
* necessary, in order to reduce overhead. If the
* select() call indicates a timeout, we need the
* dispatch. Even if not, if we set the 0-timeout
* for the select() call, we need to check the timer
* events. In the 'readytasks' case, there may be no
* timeout event actually, but there is no other way
* to reduce the overhead.
* Note that we do not have to worry about the case
* where a new timer is inserted during the select()
* call, since this loop only runs in the non-thread
* mode.
*/
isc__timermgr_dispatch(ctx->timermgr);
}
if (n > 0)
(void)isc__socketmgr_dispatch(ctx->socketmgr, swait);
(void)isc__taskmgr_dispatch(ctx->taskmgr);
}
return (ISC_R_SUCCESS);
}
void
isc_timermgr_destroy(isc_timermgr_t **managerp) {
isc_timermgr_t *manager;
isc_mem_t *mctx;
/*
* Destroy a timer manager.
*/
REQUIRE(managerp != NULL);
manager = *managerp;
REQUIRE(VALID_MANAGER(manager));
LOCK(&manager->lock);
#ifndef ISC_PLATFORM_USETHREADS
if (manager->refs > 1) {
manager->refs--;
UNLOCK(&manager->lock);
*managerp = NULL;
return;
}
isc__timermgr_dispatch();
#endif /* ISC_PLATFORM_USETHREADS */
REQUIRE(EMPTY(manager->timers));
manager->done = ISC_TRUE;
#ifdef ISC_PLATFORM_USETHREADS
XTRACE(isc_msgcat_get(isc_msgcat, ISC_MSGSET_TIMER,
ISC_MSG_SIGNALDESTROY, "signal (destroy)"));
SIGNAL(&manager->wakeup);
#endif /* ISC_PLATFORM_USETHREADS */
UNLOCK(&manager->lock);
#ifdef ISC_PLATFORM_USETHREADS
/*
* Wait for thread to exit.
*/
if (isc_thread_join(manager->thread, NULL) != ISC_R_SUCCESS)
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_thread_join() %s",
isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
ISC_MSG_FAILED, "failed"));
#endif /* ISC_PLATFORM_USETHREADS */
/*
* Clean up.
*/
#ifdef ISC_PLATFORM_USETHREADS
(void)isc_condition_destroy(&manager->wakeup);
#endif /* ISC_PLATFORM_USETHREADS */
DESTROYLOCK(&manager->lock);
isc_heap_destroy(&manager->heap);
manager->magic = 0;
mctx = manager->mctx;
isc_mem_put(mctx, manager, sizeof(*manager));
isc_mem_detach(&mctx);
*managerp = NULL;
}
