d6b50a1d3f
nxstyle fixes to pass the CI checks Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
132 lines
5.0 KiB
C
132 lines
5.0 KiB
C
/****************************************************************************
|
|
* libs/libc/unistd/lib/lib_sleep.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <unistd.h>
|
|
#include <signal.h>
|
|
|
|
#include <nuttx/clock.h>
|
|
#include <arch/irq.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: sleep
|
|
*
|
|
* Description:
|
|
* The 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 and its action is to invoke a signal-catching function or to
|
|
* terminate the process. The suspension time may be longer than requested
|
|
* due to the scheduling of other activity by the system.
|
|
*
|
|
* If a SIGALRM signal is generated for the calling process during
|
|
* execution of sleep() and if the SIGALRM signal is being ignored or
|
|
* blocked from delivery, it is unspecified whether sleep() returns
|
|
* when the SIGALRM signal is scheduled. If the signal is being blocked, it
|
|
* is also unspecified whether it remains pending after sleep() returns or
|
|
* it is discarded.
|
|
*
|
|
* If a SIGALRM signal is generated for the calling process during
|
|
* execution of sleep(), except as a result of a prior call to alarm(),
|
|
* and if the SIGALRM signal is not being ignored or blocked from delivery,
|
|
* it is unspecified whether that signal has any effect other than causing
|
|
* sleep() to return.
|
|
*
|
|
* If a signal-catching function interrupts sleep() and examines or changes
|
|
* either the time a SIGALRM is scheduled to be generated, the action
|
|
* associated with the SIGALRM signal, or whether the SIGALRM signal is
|
|
* blocked from delivery, the results are unspecified.
|
|
*
|
|
* If a signal-catching function interrupts sleep() and calls siglongjmp()
|
|
* or longjmp() to restore an environment saved prior to the sleep() call,
|
|
* the action associated with the SIGALRM signal and the time at which a
|
|
* SIGALRM signal is scheduled to be generated are unspecified. It is also
|
|
* unspecified whether the SIGALRM signal is blocked, unless the process'
|
|
* signal mask is restored as part of the environment.
|
|
*
|
|
* Implementations may place limitations on the granularity of timer
|
|
* values. For each interval timer, if the requested timer value requires a
|
|
* finer granularity than the implementation supports, the actual timer
|
|
* value will be rounded up to the next supported value.
|
|
*
|
|
* Interactions between sleep() and any of setitimer(), ualarm() or sleep()
|
|
* are unspecified.
|
|
*
|
|
* Input Parameters:
|
|
* seconds - The number of seconds to sleep
|
|
*
|
|
* Returned Value:
|
|
* If sleep() returns because the requested time has elapsed, the value
|
|
* returned will be 0. If 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.
|
|
*
|
|
* Assumptions:
|
|
*
|
|
****************************************************************************/
|
|
|
|
unsigned int 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 clock_nanosleep() do all of the work. */
|
|
|
|
rqtp.tv_sec = seconds;
|
|
rqtp.tv_nsec = 0;
|
|
|
|
ret = clock_nanosleep(CLOCK_REALTIME, 0, &rqtp, &rmtp);
|
|
|
|
/* clock_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;
|
|
}
|