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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** POSIX wrapper for THREADX */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#include "tx_api.h" /* Threadx API */
#include "pthread.h" /* Posix API */
#include "px_int.h" /* Posix helper functions */
#include <limits.h>
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* nanosleep PORTABLE C */
/* 6.2.0 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function shall cause the current thread to be suspended from */
/* execution until the time interval specified by the req argument has */
/* elapsed. */
/* */
/* INPUT */
/* */
/* req The number of real-time (as opposed */
/* to CPU-time) seconds and nanoseconds to */
/* suspend the calling thread. */
/* rem Points to a structure to receive the */
/* remaining time if the function is */
/* interrupted by a signal. This pointer */
/* may be NULL. */
/* */
/* OUTPUT */
/* */
/* zero If the function returns because the */
/* requested time has elapsed. */
/* */
/* -1 If this functions fails if req argument */
/* specified a nanosecond value greater */
/* than or equal to 1 billion. */
/* */
/* */
/* CALLS */
/* */
/* tx_thread_sleep ThreadX thread sleep service */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
INT nanosleep(struct timespec *req, struct timespec *rem)
{
ULONG timer_ticks;
/* Check for valid inputs - the nanosecond value must be less than 1 billion
and not roll over when converting to ThreadX timer ticks. */
if ( (!req) || (req->tv_nsec > 999999999) || ((timer_ticks = (req->tv_sec * CPU_TICKS_PER_SECOND + req->tv_nsec/NANOSECONDS_IN_CPU_TICK)) < req->tv_sec) )
{
posix_errno = EINVAL;
posix_set_pthread_errno(EINVAL);
return(ERROR);
}
/* Add padding of 1 so that the thread will sleep no less than the specified time,
except in the case that timer_ticks is ULONG_MAX */
if(timer_ticks != ULONG_MAX)
{
timer_ticks = timer_ticks + 1;
}
/* Now call ThreadX thread sleep service. */
tx_thread_sleep(timer_ticks);
/* Sleep completed. */
if (rem)
{
rem->tv_nsec = 0;
rem->tv_sec = 0;
}
return(OK);
}
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