109 lines
3.5 KiB
C
109 lines
3.5 KiB
C
/****************************************************************************
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* sched/signal/sig_sleep.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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 <signal.h>
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#include <nuttx/clock.h>
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#include <nuttx/signal.h>
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#include <arch/irq.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxsig_sleep
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*
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* Description:
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* The nxsig_sleep() function will cause the calling thread to be
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* suspended from execution until either the number of real-time seconds
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* specified by the argument 'seconds' has elapsed or a signal is
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* delivered to the calling thread.
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*
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* This is an internal OS interface. It is functionally equivalent to
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* the standard sleep() application interface except that:
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*
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* - It is not a cancellation point, and
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* - There is no check that the action of the signal is to invoke a
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* signal-catching function or to terminate the process.
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*
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* See the description of sleep() for additional information that is not
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* duplicated here.
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*
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* Input Parameters:
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* seconds - The number of seconds to sleep
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*
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* Returned Value:
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* If nxsig_sleep() returns because the requested time has elapsed, the
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* value returned will be zero (OK). If nxsig_sleep() returns because of
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* premature arousal due to delivery of a signal, the return value will
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* be the "unslept" amount (the requested time minus the time actually
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* slept) in seconds.
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*
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****************************************************************************/
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unsigned int nxsig_sleep(unsigned int seconds)
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{
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struct timespec rqtp;
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struct timespec rmtp;
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unsigned int remaining = 0;
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int ret;
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/* Don't sleep if seconds == 0 */
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if (seconds > 0)
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{
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/* Let nxsig_nanosleep() do all of the work. */
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rqtp.tv_sec = seconds;
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rqtp.tv_nsec = 0;
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ret = nxsig_nanosleep(&rqtp, &rmtp);
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/* nanosleep() should only fail if it was interrupted by a signal,
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* but we treat all errors the same,
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*/
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if (ret < 0)
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{
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remaining = rmtp.tv_sec;
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if (remaining < seconds && rmtp.tv_nsec >= 500000000)
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{
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/* Round up */
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remaining++;
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}
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}
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return remaining;
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}
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return 0;
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}
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