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pthread_delay_np.c
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pthread_delay_np.c
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/*
* pthreads_delay_np.c
*
* Description:
* This translation unit implements non-portable thread functions.
*
* --------------------------------------------------------------------------
*
* Pthreads4w - POSIX Threads for Windows
* Copyright 1998 John E. Bossom
* Copyright 1999-2018, Pthreads4w contributors
*
* Homepage: https://sourceforge.net/projects/pthreads4w/
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
*
* https://sourceforge.net/p/pthreads4w/wiki/Contributors/
*
* Licensed 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.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "pthread.h"
#include "implement.h"
/*
* pthread_delay_np
*
* DESCRIPTION
*
* This routine causes a thread to delay execution for a specific period of time.
* This period ends at the current time plus the specified interval. The routine
* will not return before the end of the period is reached, but may return an
* arbitrary amount of time after the period has gone by. This can be due to
* system load, thread priorities, and system timer granularity.
*
* Specifying an interval of zero (0) seconds and zero (0) nanoseconds is
* allowed and can be used to force the thread to give up the processor or to
* deliver a pending cancellation request.
*
* The timespec structure contains the following two fields:
*
* tv_sec is an integer number of seconds.
* tv_nsec is an integer number of nanoseconds.
*
* Return Values
*
* If an error condition occurs, this routine returns an integer value indicating
* the type of error. Possible return values are as follows:
*
* 0
* Successful completion.
* [EINVAL]
* The value specified by interval is invalid.
*
* Example
*
* The following code segment would wait for 5 and 1/2 seconds
*
* struct timespec tsWait;
* int intRC;
*
* tsWait.tv_sec = 5;
* tsWait.tv_nsec = 500000000L;
* intRC = pthread_delay_np(&tsWait);
*/
int
pthread_delay_np (struct timespec *interval)
{
DWORD wait_time;
DWORD secs_in_millisecs;
DWORD millisecs;
DWORD status;
pthread_t self;
__ptw32_thread_t * sp;
if (interval == NULL)
{
return EINVAL;
}
if (interval->tv_sec == 0L && interval->tv_nsec == 0L)
{
pthread_testcancel ();
Sleep (0);
pthread_testcancel ();
return (0);
}
/* convert secs to millisecs */
secs_in_millisecs = (DWORD)interval->tv_sec * 1000L;
/* convert nanosecs to millisecs (rounding up) */
millisecs = (interval->tv_nsec + 999999L) / 1000000L;
#if defined(__WATCOMC__)
#pragma disable_message (124)
#endif
/*
* Most compilers will issue a warning 'comparison always 0'
* because the variable type is unsigned, but we need to keep this
* for some reason I can't recall now.
*/
if (0 > (wait_time = secs_in_millisecs + millisecs))
{
return EINVAL;
}
#if defined(__WATCOMC__)
#pragma enable_message (124)
#endif
if (NULL == (self = pthread_self ()).p)
{
return ENOMEM;
}
sp = (__ptw32_thread_t *) self.p;
if (sp->cancelState == PTHREAD_CANCEL_ENABLE)
{
/*
* Async cancellation won't catch us until wait_time is up.
* Deferred cancellation will cancel us immediately.
*/
if (WAIT_OBJECT_0 ==
(status = WaitForSingleObject (sp->cancelEvent, wait_time)))
{
__ptw32_mcs_local_node_t stateLock;
/*
* Canceling!
*/
__ptw32_mcs_lock_acquire (&sp->stateLock, &stateLock);
if (sp->state < PThreadStateCanceling)
{
sp->state = PThreadStateCanceling;
sp->cancelState = PTHREAD_CANCEL_DISABLE;
__ptw32_mcs_lock_release (&stateLock);
__ptw32_throw (__PTW32_EPS_CANCEL);
}
__ptw32_mcs_lock_release (&stateLock);
return ESRCH;
}
else if (status != WAIT_TIMEOUT)
{
return EINVAL;
}
}
else
{
Sleep (wait_time);
}
return (0);
}