77 строки
3.2 KiB
C++
77 строки
3.2 KiB
C++
/*---------------------------------------------------------------
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* Copyright (c) 1999,2000,2001,2002,2003
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* The Board of Trustees of the University of Illinois
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* All Rights Reserved.
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*---------------------------------------------------------------
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software (Iperf) and associated
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* documentation files (the "Software"), to deal in the Software
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* without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute,
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* sublicense, and/or sell copies of the Software, and to permit
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* persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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*
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* Redistributions of source code must retain the above
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* copyright notice, this list of conditions and
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* the following disclaimers.
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*
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimers in the documentation and/or other materials
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* provided with the distribution.
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*
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*
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* Neither the names of the University of Illinois, NCSA,
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* nor the names of its contributors may be used to endorse
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* or promote products derived from this Software without
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* specific prior written permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE CONTIBUTORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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* ________________________________________________________________
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* National Laboratory for Applied Network Research
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* National Center for Supercomputing Applications
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* University of Illinois at Urbana-Champaign
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* http://www.ncsa.uiuc.edu
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* ________________________________________________________________
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*
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* delay.c
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* by Mark Gates <mgates@nlanr.net>
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* -------------------------------------------------------------------
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* accurate microsecond delay
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* ------------------------------------------------------------------- */
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#include "Timestamp.hpp"
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#include "util.h"
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#include "delay.hpp"
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/* -------------------------------------------------------------------
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* A micro-second delay function using POSIX nanosleep(). This allows a
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* higher timing resolution (under Linux e.g. it uses hrtimers), does not
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* affect any signals, and will use up remaining time when interrupted.
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* ------------------------------------------------------------------- */
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void delay_loop(unsigned long usec)
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{
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struct timespec requested, remaining;
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requested.tv_sec = 0;
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requested.tv_nsec = usec * 1000L;
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while (nanosleep(&requested, &remaining) == -1)
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if (errno == EINTR)
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requested = remaining;
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else {
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WARN_errno(1, "nanosleep");
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break;
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}
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}
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