77 lines
2.9 KiB
C
77 lines
2.9 KiB
C
/****************************************************************************
|
|
* sched/sched/sched_wait.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 <sys/wait.h>
|
|
#include <signal.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/sched.h>
|
|
|
|
#include "sched/sched.h"
|
|
|
|
#if defined(CONFIG_SCHED_WAITPID) && defined(CONFIG_SCHED_HAVE_PARENT)
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: wait
|
|
*
|
|
* Description:
|
|
* The wait() function will suspend execution of the calling thread until
|
|
* status information for one of its terminated child processes is
|
|
* available, or until delivery of a signal whose action is either to
|
|
* execute a signal-catching function or to terminate the process. If more
|
|
* than one thread is suspended in wait() or waitpid() awaiting termination
|
|
* of the same process, exactly one thread will return the process status
|
|
* at the time of the target process termination. If status information is
|
|
* available prior to the call to wait(), return will be immediate.
|
|
*
|
|
* The waitpid() function will behave identically to wait(), if the pid
|
|
* argument is INVALID_PROCESS_ID and the options argument is 0. Otherwise,
|
|
* its behaviour will be modified by the values of the pid and options
|
|
* arguments.
|
|
*
|
|
* Input Parameters:
|
|
* stat_loc - The location to return the exit status
|
|
*
|
|
* Returned Value:
|
|
* See waitpid();
|
|
*
|
|
****************************************************************************/
|
|
|
|
pid_t wait(FAR int *stat_loc)
|
|
{
|
|
/* wait() is a cancellation point, but nothings needs to be done for this
|
|
* trivial case.
|
|
*/
|
|
|
|
return waitpid(INVALID_PROCESS_ID, stat_loc, 0);
|
|
}
|
|
|
|
#endif /* CONFIG_SCHED_WAITPID && CONFIG_SCHED_HAVE_PARENT */
|