221 lines
7.0 KiB
C
221 lines
7.0 KiB
C
/****************************************************************************
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* sched/timer/timer_create.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <time.h>
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#include <string.h>
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#include <errno.h>
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#include <nuttx/irq.h>
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#include <nuttx/wdog.h>
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#include <nuttx/kmalloc.h>
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#include "timer/timer.h"
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#ifndef CONFIG_DISABLE_POSIX_TIMERS
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: timer_allocate
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*
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* Description:
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* Allocate one POSIX timer and place it into the allocated timer list.
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*
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****************************************************************************/
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static FAR struct posix_timer_s *timer_allocate(void)
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{
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FAR struct posix_timer_s *ret;
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irqstate_t flags;
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uint8_t pt_flags;
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/* Try to get a preallocated timer from the free list */
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#if CONFIG_PREALLOC_TIMERS > 0
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flags = enter_critical_section();
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ret = (FAR struct posix_timer_s *)
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sq_remfirst((FAR sq_queue_t *)&g_freetimers);
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leave_critical_section(flags);
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/* Did we get one? */
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if (ret)
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{
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pt_flags = PT_FLAGS_PREALLOCATED;
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}
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else
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#endif
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{
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/* Allocate a new timer from the heap */
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ret = (FAR struct posix_timer_s *)
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kmm_malloc(sizeof(struct posix_timer_s));
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pt_flags = 0;
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}
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/* If we have a timer, then put it into the allocated timer list */
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if (ret)
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{
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/* Initialize the timer structure */
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memset(ret, 0, sizeof(struct posix_timer_s));
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ret->pt_flags = pt_flags;
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/* And add it to the end of the list of allocated timers */
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flags = enter_critical_section();
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sq_addlast((FAR sq_entry_t *)ret, (FAR sq_queue_t *)&g_alloctimers);
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leave_critical_section(flags);
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}
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return ret;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: timer_create
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*
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* Description:
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* The timer_create() function creates per-thread timer using the
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* specified clock, clock_id, as the timing base. The timer_create()
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* function returns, in the location referenced by timerid, a timer ID of
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* type timer_t used to identify the timer in timer requests. This timer
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* ID is unique until the timer is deleted. The particular clock, clock_id,
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* is defined in <time.h>. The timer whose ID is returned will be in a
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* disarmed state upon return from timer_create().
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*
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* The evp argument, if non-NULL, points to a sigevent structure. This
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* structure is allocated by the called and defines the asynchronous
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* notification to occur. If the evp argument is NULL, the effect is as
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* if the evp argument pointed to a sigevent structure with the
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* sigev_notify member having the value SIGEV_SIGNAL, the sigev_signo
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* having a default signal number, and the sigev_value member having the
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* value of the timer ID.
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*
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* Each implementation defines a set of clocks that can be used as timing
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* bases for per-thread timers.
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*
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* Input Parameters:
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* clockid - Specifies the clock to use as the timing base.
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* evp - Refers to a user allocated sigevent structure that defines the
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* asynchronous notification. evp may be NULL (see above).
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* timerid - The pre-thread timer created by the call to timer_create().
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*
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* Returned Value:
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* If the call succeeds, timer_create() will return 0 (OK) and update the
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* location referenced by timerid to a timer_t, which can be passed to the
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* other per-thread timer calls. If an error occurs, the function will
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* return a value of -1 (ERROR) and set errno to indicate the error.
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*
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* EAGAIN - The system lacks sufficient signal queuing resources to honor
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* the request.
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* EAGAIN - The calling process has already created all of the timers it
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* is allowed by this implementation.
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* EINVAL - The specified clock ID is not defined.
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* ENOTSUP - The implementation does not support the creation of a timer
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* attached to the CPU-time clock that is specified by clock_id and
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* associated with a thread different thread invoking timer_create().
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*
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* Assumptions:
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*
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****************************************************************************/
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int timer_create(clockid_t clockid, FAR struct sigevent *evp,
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FAR timer_t *timerid)
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{
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FAR struct posix_timer_s *ret;
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/* Sanity checks. */
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if (timerid == NULL || (clockid != CLOCK_REALTIME
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#ifdef CONFIG_CLOCK_MONOTONIC
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&& clockid != CLOCK_MONOTONIC
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#endif /* CONFIG_CLOCK_MONOTONIC */
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))
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{
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set_errno(EINVAL);
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return ERROR;
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}
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/* Allocate a timer instance to contain the watchdog */
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ret = timer_allocate();
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if (!ret)
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{
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set_errno(EAGAIN);
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return ERROR;
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}
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/* Initialize the timer instance */
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ret->pt_clock = clockid;
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ret->pt_crefs = 1;
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ret->pt_owner = getpid();
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ret->pt_delay = 0;
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/* Was a struct sigevent provided? */
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if (evp)
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{
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/* Yes, copy the entire struct sigevent content */
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memcpy(&ret->pt_event, evp, sizeof(struct sigevent));
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}
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else
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{
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/* "If the evp argument is NULL, the effect is as if the evp argument
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* pointed to a sigevent structure with the sigev_notify member
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* having the value SIGEV_SIGNAL, the sigev_signo having a default
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* signal number, and the sigev_value member having the value of the
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* timer ID."
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*/
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ret->pt_event.sigev_notify = SIGEV_SIGNAL;
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ret->pt_event.sigev_signo = SIGALRM;
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ret->pt_event.sigev_value.sival_ptr = ret;
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#ifdef CONFIG_SIG_EVTHREAD
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ret->pt_event.sigev_notify_function = NULL;
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ret->pt_event.sigev_notify_attributes = NULL;
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#endif
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}
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/* Return the timer */
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*timerid = ret;
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return OK;
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}
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#endif /* CONFIG_DISABLE_POSIX_TIMERS */
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