122 lines
4.2 KiB
C
122 lines
4.2 KiB
C
/****************************************************************************
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* sched/signal/sig_sleep.c
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*
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* Copyright (C) 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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