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| author | davidxu <davidxu@FreeBSD.org> | 2006-03-01 06:37:34 +0000 |
|---|---|---|
| committer | davidxu <davidxu@FreeBSD.org> | 2006-03-01 06:37:34 +0000 |
| commit | 22fb15cfe91543bc3721037d122a43e7b10c31a7 (patch) | |
| tree | a7e37e79c63fdff7c727e15309ae536bad438159 /lib/librt/timer.c | |
| parent | 1d823bfa306c8b22899f10deae2f0d43420d35f1 (diff) | |
| download | FreeBSD-src-22fb15cfe91543bc3721037d122a43e7b10c31a7.zip FreeBSD-src-22fb15cfe91543bc3721037d122a43e7b10c31a7.tar.gz | |
Bring in my initial version of POSIX realtime extension library.
Current the library implements mqueue, timer and aio with SIGEV_THREAD
notification supported.
Earlier version reviewed by: deischen
Diffstat (limited to 'lib/librt/timer.c')
| -rw-r--r-- | lib/librt/timer.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/lib/librt/timer.c b/lib/librt/timer.c new file mode 100644 index 0000000..bbb2290 --- /dev/null +++ b/lib/librt/timer.c @@ -0,0 +1,181 @@ +/* + * Copyright (c) 2006 David Xu <davidxu@freebsd.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice unmodified, this list of conditions, and the following + * disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * $FreeBSD$ + * + */ + +#include <sys/cdefs.h> +#include <sys/types.h> +#include <sys/syscall.h> + +#include "namespace.h" +#include <errno.h> +#include <pthread.h> +#include <stddef.h> +#include <signal.h> +#include <stdlib.h> +#include <time.h> +#include <unistd.h> +#include "sigev_thread.h" +#include "un-namespace.h" + +extern int __sys_ktimer_create(clockid_t, struct sigevent *__restrict, + int *__restrict); +extern int __sys_ktimer_delete(int); +extern int __sys_ktimer_gettime(int, struct itimerspec *); +extern int __sys_ktimer_getoverrun(int); +extern int __sys_ktimer_settime(int, int, + const struct itimerspec *__restrict, struct itimerspec *__restrict); + +struct __timer { + int oshandle; + struct sigev_node *node; +}; + +__weak_reference(__timer_create, timer_create); +__weak_reference(__timer_create, _timer_create); +__weak_reference(__timer_delete, timer_delete); +__weak_reference(__timer_delete, _timer_delete); +__weak_reference(__timer_gettime, timer_gettime); +__weak_reference(__timer_gettime, _timer_gettime); +__weak_reference(__timer_settime, timer_settime); +__weak_reference(__timer_settime, _timer_settime); +__weak_reference(__timer_getoverrun, timer_getoverrun); +__weak_reference(__timer_getoverrun, _timer_getoverrun); + +typedef void (*timer_func)(union sigval val, int timerid, int overrun); + +static void +timer_dispatch(struct sigev_node *sn, siginfo_t *si) +{ + timer_func f = sn->sn_func; + + /* I want to avoid expired notification. */ + if (si->si_value.sival_int == sn->sn_gen) + f(sn->sn_value, si->si_timerid, si->si_overrun); +} + +int +__timer_create(clockid_t clockid, struct sigevent *evp, timer_t *timerid) +{ + struct __timer *timer; + struct sigevent ev; + struct sigev_node *sn; + int ret, err; + + timer = malloc(sizeof(struct __timer)); + if (timer == NULL) + return (-1); + + if (evp == NULL || evp->sigev_notify != SIGEV_THREAD) { + ret = __sys_ktimer_create(clockid, evp, &timer->oshandle); + if (ret == -1) { + err = errno; + free(timer); + errno = err; + return (ret); + } + timer->node = NULL; + *timerid = timer; + return (0); + } + + if (__sigev_check_init()) { + errno = EINVAL; + return (-1); + } + + sn = __sigev_alloc(SI_TIMER, evp); + if (sn == NULL) { + errno = EAGAIN; + return (-1); + } + + __sigev_get_sigevent(sn, &ev, sn->sn_gen); + ret = __sys_ktimer_create(clockid, &ev, &timer->oshandle); + if (ret != 0) { + err = errno; + __sigev_free(sn); + free(timer); + errno = err; + return (-1); + } + sn->sn_dispatch = timer_dispatch; + sn->sn_id = timer->oshandle; + __sigev_list_lock(); + __sigev_register(sn); + __sigev_list_unlock(); + *timerid = timer; + return (0); +} + +int +__timer_delete(timer_t timerid) +{ + int ret, err; + + if (timerid->node != NULL) { + __sigev_list_lock(); + __sigev_delete_node(timerid->node); + __sigev_list_unlock(); + } + ret = __sys_ktimer_delete(timerid->oshandle); + err = errno; + free(timerid); + errno = err; + return (ret); +} + +int +__timer_gettime(timer_t timerid, struct itimerspec *value) +{ + + return __sys_ktimer_gettime(timerid->oshandle, value); +} + +int +__timer_getoverrun(timer_t timerid) +{ + + return __sys_ktimer_getoverrun(timerid->oshandle); +} + +int +__timer_settime(timer_t timerid, int flags, + const struct itimerspec *__restrict value, + struct itimerspec *__restrict ovalue) +{ + + return __sys_ktimer_settime(timerid->oshandle, + flags, value, ovalue); +} + +int +__timer_oshandle(timer_t timerid) +{ + + return (timerid->oshandle); +} |
