132 lines
4.8 KiB
C
132 lines
4.8 KiB
C
/****************************************************************************
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* sched/timer/timer_setitimer.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 <errno.h>
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#include <time.h>
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#include <sys/time.h>
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#include "sched/sched.h"
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#ifndef CONFIG_DISABLE_POSIX_TIMERS
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: setitimer
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*
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* Description:
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* The setitimer() function sets the time until the next expiration of
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* the timer specified by which from the it_value member of the value
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* argument and arm the timer if the it_value member of value is non-zero.
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* If the specified timer was already armed when setitimer() is
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* called, this call will reset the time until next expiration to the
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* value specified. If the it_value member of value is zero, the timer
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* will be disarmed. The effect of disarming or resetting a timer with
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* pending expiration notifications is unspecified.
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*
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* The reload value of the timer will be set to the value specified by the
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* it_interval member of value. When a timer is armed with a non-zero
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* it_interval, a periodic (or repetitive) timer is specified.
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*
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* Time values that are between two consecutive non-negative integer
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* multiples of the resolution of the specified timer will be rounded up
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* to the larger multiple of the resolution. Quantization error will not
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* cause the timer to expire earlier than the rounded time value.
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*
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* If the argument ovalue is not NULL, the setitimer() function will
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* store, in the location referenced by ovalue, a value representing the
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* previous amount of time before the timer would have expired, or zero if
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* the timer was disarmed, together with the previous timer reload value.
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* Timers will not expire before their scheduled time.
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*
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* Input Parameters:
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* which - The predefined timer id
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* value - Specifies the timer value to set
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* ovalue - A location in which to return the time remaining from the
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* previous timer setting.
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*
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* Returned Value:
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* If the setitimer() succeeds, a value of 0 (OK) will be returned.
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* If an error occurs, the value -1 (ERROR) will be returned, and errno set
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* to indicate the error.
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*
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* EINVAL - The which argument does not correspond to an predefined ID.
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* EINVAL - A value structure specified a microsecond value less than zero
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* or greater than or equal to 1000 million, and the it_value member of
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* that structure did not specify zero seconds and nanoseconds.
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*
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* Assumptions:
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*
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****************************************************************************/
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int setitimer(int which, FAR const struct itimerval *value,
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FAR struct itimerval *ovalue)
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{
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FAR struct tcb_s *rtcb = this_task();
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struct itimerspec spec;
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struct itimerspec ospec;
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irqstate_t flags;
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int ret = OK;
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if (which != ITIMER_REAL || !value)
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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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if (!rtcb->group->itimer)
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{
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flags = enter_critical_section();
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if (!rtcb->group->itimer)
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{
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ret = timer_create(CLOCK_REALTIME, NULL, &rtcb->group->itimer);
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}
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leave_critical_section(flags);
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if (ret != OK)
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{
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return ret;
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}
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}
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TIMEVAL_TO_TIMESPEC(&value->it_value, &spec.it_value);
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TIMEVAL_TO_TIMESPEC(&value->it_interval, &spec.it_interval);
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ret = timer_settime(rtcb->group->itimer, 0, &spec, ovalue ? &ospec : NULL);
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if (ret == OK && ovalue)
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{
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TIMESPEC_TO_TIMEVAL(&ovalue->it_value, &ospec.it_value);
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TIMESPEC_TO_TIMEVAL(&ovalue->it_interval, &ospec.it_interval);
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}
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return ret;
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}
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#endif /* CONFIG_DISABLE_POSIX_TIMERS */
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