936df1bcb5
Squashed commit of the following:
Change all calls to usleep() in the OS proper to calls to nxsig_usleep()
sched/signal: Add a new OS internal function nxsig_usleep() that is functionally equivalent to usleep() but does not cause a cancellaption point and does not modify the errno variable.
sched/signal: Add a new OS internal function nxsig_sleep() that is functionally equivalent to sleep() but does not cause a cancellaption point.
122 lines
4.2 KiB
C
122 lines
4.2 KiB
C
/****************************************************************************
|
|
* sched/signal/sig_sleep.c
|
|
*
|
|
* Copyright (C) 2017 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* 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, 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.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "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
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS 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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <signal.h>
|
|
|
|
#include <nuttx/clock.h>
|
|
#include <nuttx/signal.h>
|
|
|
|
#include <arch/irq.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: nxsig_sleep
|
|
*
|
|
* Description:
|
|
* The nxsig_sleep() function will cause the calling thread to be
|
|
* suspended from execution until either the number of real-time seconds
|
|
* specified by the argument 'seconds' has elapsed or a signal is
|
|
* delivered to the calling thread.
|
|
*
|
|
* This is an internal OS interface. It is functionally equivalent to
|
|
* the standard sleep() application interface except that:
|
|
*
|
|
* - It is not a cancellaction point, and
|
|
* - There is no check that the action of the signal is to invoke a
|
|
* signal-catching function or to terminate the process.
|
|
*
|
|
* See the description of sleep() for additional information that is not
|
|
* duplicated here.
|
|
*
|
|
* Parameters:
|
|
* seconds - The number of seconds to sleep
|
|
*
|
|
* Returned Value:
|
|
* If nxsig_sleep() returns because the requested time has elapsed, the
|
|
* value returned will be zero (OK). If nxsig_sleep() returns because of
|
|
* premature arousal due to delivery of a signal, the return value will
|
|
* be the "unslept" amount (the requested time minus the time actually
|
|
* slept) in seconds.
|
|
*
|
|
****************************************************************************/
|
|
|
|
unsigned int nxsig_sleep(unsigned int seconds)
|
|
{
|
|
struct timespec rqtp;
|
|
struct timespec rmtp;
|
|
unsigned int remaining = 0;
|
|
int ret;
|
|
|
|
/* Don't sleep if seconds == 0 */
|
|
|
|
if (seconds > 0)
|
|
{
|
|
/* Let nxsig_nanosleep() do all of the work. */
|
|
|
|
rqtp.tv_sec = seconds;
|
|
rqtp.tv_nsec = 0;
|
|
|
|
ret = nxsig_nanosleep(&rqtp, &rmtp);
|
|
|
|
/* nanosleep() should only fail if it was interrupted by a signal,
|
|
* but we treat all errors the same,
|
|
*/
|
|
|
|
if (ret < 0)
|
|
{
|
|
remaining = rmtp.tv_sec;
|
|
if (remaining < seconds && rmtp.tv_nsec >= 500000000)
|
|
{
|
|
/* Round up */
|
|
|
|
remaining++;
|
|
}
|
|
}
|
|
|
|
return remaining;
|
|
}
|
|
|
|
return 0;
|
|
}
|