blob: c1f41b598ab14be5f4234b754acb08d1dca3bf5d [file] [log] [blame] [edit]
/*---------------------------------------------------------------
* Copyright (c) 1999,2000,2001,2002,2003
* The Board of Trustees of the University of Illinois
* All Rights Reserved.
*---------------------------------------------------------------
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software (Iperf) and associated
* documentation files (the "Software"), to deal in the Software
* without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of the Software, and to permit
* persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and
* the following disclaimers.
*
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimers in the documentation and/or other materials
* provided with the distribution.
*
*
* Neither the names of the University of Illinois, NCSA,
* nor the names of its contributors may be used to endorse
* or promote products derived from this Software without
* specific prior written permission.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
* ________________________________________________________________
* National Laboratory for Applied Network Research
* National Center for Supercomputing Applications
* University of Illinois at Urbana-Champaign
* http://www.ncsa.uiuc.edu
* ________________________________________________________________
*
* delay.c
* by Mark Gates <mgates@nlanr.net>
* -------------------------------------------------------------------
* accurate microsecond delay
* ------------------------------------------------------------------- */
#include "Timestamp.hpp"
#include "util.h"
#include "delay.hpp"
/* -------------------------------------------------------------------
* A micro-second delay function using POSIX nanosleep(). This allows a
* higher timing resolution (under Linux e.g. it uses hrtimers), does not
* affect any signals, and will use up remaining time when interrupted.
* ------------------------------------------------------------------- */
void delay_loop(unsigned long usec)
{
struct timespec requested, remaining;
requested.tv_sec = 0;
requested.tv_nsec = usec * 1000L;
while (nanosleep(&requested, &remaining) == -1)
if (errno == EINTR)
requested = remaining;
else {
WARN_errno(1, "nanosleep");
break;
}
}