mirror of https://gitee.com/bigwinds/arangodb
147 lines
3.7 KiB
C++
147 lines
3.7 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 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 ArangoDB GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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////////////////////////////////////////////////////////////////////////////////
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#include "random.h"
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#include "Basics/threads.h"
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////////////////////////////////////////////////////////////////////////////////
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/// @brief already initialized
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////////////////////////////////////////////////////////////////////////////////
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static bool Initialized = false;
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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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/* ignore 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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#else
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seed = (unsigned long)time(0);
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#endif
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seed ^= (unsigned long)(TRI_CurrentProcessId() << 8);
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seed ^= (unsigned long)(TRI_CurrentProcessId() << 16);
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seed ^= (unsigned long)(TRI_CurrentProcessId() << 24);
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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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/// @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 TRI_random() & 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 = TRI_random();
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l2 = TRI_random();
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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)TRI_random();
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l2 = (uint32_t)TRI_random();
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return ((l1 & 0xFFFF) << 16) | (l2 & 0xFFFF);
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#else
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#ifdef _WIN32
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unsigned int number;
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auto err = rand_s(&number);
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if (err == 0) {
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return number;
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}
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#endif
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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 = TRI_random();
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l2 = TRI_random();
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l3 = TRI_random();
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l4 = TRI_random();
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return ((l1 & 0xFF) << 24) | ((l2 & 0xFF) << 16) | ((l3 & 0xFF) << 8) |
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(l4 & 0xFF);
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#endif
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief initializes the random components
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////////////////////////////////////////////////////////////////////////////////
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void TRI_InitializeRandom(void) {
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if (Initialized) {
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return;
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}
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TRI_srandom(SeedRandom());
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Initialized = true;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief shuts down the random components
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////////////////////////////////////////////////////////////////////////////////
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void TRI_ShutdownRandom(void) {
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if (!Initialized) {
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return;
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}
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Initialized = false;
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}
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