mirror of https://gitee.com/bigwinds/arangodb
208 lines
6.3 KiB
C
208 lines
6.3 KiB
C
////////////////////////////////////////////////////////////////////////////////
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/// @brief random functions
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2004-2013 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is triAGENS GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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/// @author Copyright 2011-2013, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#include "random.h"
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#include "BasicsC/threads.h"
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// -----------------------------------------------------------------------------
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// --SECTION-- private variables
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup Random
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief already initialised
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////////////////////////////////////////////////////////////////////////////////
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static bool Initialised = false;
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// -----------------------------------------------------------------------------
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// --SECTION-- private functions
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup Random
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief generates a seed
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////////////////////////////////////////////////////////////////////////////////
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static unsigned long SeedRandom (void) {
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unsigned long seed;
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#ifdef TRI_HAVE_GETTIMEOFDAY
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struct timeval tv;
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int result;
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#endif
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seed = (unsigned long) time(0);
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#ifdef TRI_HAVE_GETTIMEOFDAY
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result = gettimeofday(&tv, 0);
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seed ^= (unsigned long)(tv.tv_sec);
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seed ^= (unsigned long)(tv.tv_usec);
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seed ^= (unsigned long)(result);
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#endif
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seed ^= (unsigned long)(TRI_CurrentProcessId());
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seed ^= (unsigned long)(TRI_CurrentThreadId());
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return seed;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// -----------------------------------------------------------------------------
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// --SECTION-- public functions
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup Random
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief generates a 16 bit random unsigned integer
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////////////////////////////////////////////////////////////////////////////////
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uint16_t TRI_UInt16Random (void) {
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#if RAND_MAX == 2147483647
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return rand() & 0xFFFF;
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#else
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uint32_t l1;
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uint32_t l2;
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l1 = rand();
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l2 = rand();
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return ((l1 & 0xFF) << 8) | (l2 & 0xFF);
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#endif
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief generates a 32 bit random unsigned integer
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////////////////////////////////////////////////////////////////////////////////
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uint32_t TRI_UInt32Random (void) {
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#if RAND_MAX == 2147483647
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uint32_t l1;
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uint32_t l2;
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l1 = (uint32_t) rand();
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l2 = (uint32_t) rand();
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return ((l1 & 0xFFFF) << 16) | (l2 & 0xFFFF);
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#else
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uint32_t l1;
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uint32_t l2;
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uint32_t l3;
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uint32_t l4;
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l1 = rand();
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l2 = rand();
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l3 = rand();
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l4 = rand();
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return ((l1 & 0xFF) << 24) | ((l2 & 0xFF) << 16) | ((l3 & 0xFF) << 8) | (l4 & 0xFF);
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#endif
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// -----------------------------------------------------------------------------
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// --SECTION-- MODULE
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// -----------------------------------------------------------------------------
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// -----------------------------------------------------------------------------
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// --SECTION-- public functions
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup Random
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief initialises the random components
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////////////////////////////////////////////////////////////////////////////////
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void TRI_InitialiseRandom (void) {
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if (Initialised) {
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return;
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}
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srandom(SeedRandom());
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Initialised = true;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief shut downs the logging components
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////////////////////////////////////////////////////////////////////////////////
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void TRI_ShutdownRandom (void) {
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if (! Initialised) {
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return;
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}
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Initialised = false;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @addtogroup\\|/// @page\\|// --SECTION--\\|/// @\\}"
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// End:
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