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randmgr.cpp

/*
 * Copyright (c) 2004 Mellanox Technologies LTD. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 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.
 *
 * $Id$
 */

#include "randmgr.h"
#include <stdlib.h>

/* set the random number seed */
int
RandomMgr::setRandomSeed( int seed ) {
  pthread_mutex_lock( &lock );
  if (randomSeed)
  {
    pthread_mutex_unlock( &lock );
    return 1;
  }
  randomSeed = seed;
  pthread_mutex_unlock( &lock );
  return 0;
}

/* get a random floating point number 0.0 - 1.0 */
float
RandomMgr::random() {
  float res;
  pthread_mutex_lock( &lock );
  res = (rand_r( &randomSeed ) * 1.0) / RAND_MAX;
  pthread_mutex_unlock( &lock );
  return res;
}

/* get the singleton pointer */
RandomMgr *RandMgr() {
  static RandomMgr *pMgr = new RandomMgr();
  return pMgr;
}

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