6486be64c3
* change picture to word * change picture to word * SHOW FULL TABLES WHERE Table_type != VIEW sql can not execute * change license description
65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
// Copyright (c) 2017, Baidu.com, Inc. All Rights Reserved
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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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#include "compat.h"
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#include "random.h"
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#include <cassert>
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#include <mutex>
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#include <random>
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#define LOCK_GLOBAL_MUTEX(m) (void)m
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namespace palo {
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std::mt19937 g_random_engine {1};
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std::mutex g_random_mutex;
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void Random::seed(unsigned int s) {
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LOCK_GLOBAL_MUTEX(g_random_mutex);
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g_random_engine.seed(s);
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}
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uint32_t Random::number32(uint32_t maximum) {
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LOCK_GLOBAL_MUTEX(g_random_mutex);
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if (maximum) {
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return std::uniform_int_distribution<uint32_t>(0, maximum-1)(g_random_engine);
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}
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return std::uniform_int_distribution<uint32_t>()(g_random_engine);
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}
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int64_t Random::number64(int64_t maximum) {
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LOCK_GLOBAL_MUTEX(g_random_mutex);
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if (maximum) {
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assert(maximum > 0);
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return std::uniform_int_distribution<int64_t>(0, maximum-1)(g_random_engine);
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}
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return std::uniform_int_distribution<int64_t>()(g_random_engine);
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}
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double Random::uniform01() {
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LOCK_GLOBAL_MUTEX(g_random_mutex);
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return std::uniform_real_distribution<>()(g_random_engine);
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}
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std::chrono::milliseconds Random::duration_millis(uint32_t maximum) {
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LOCK_GLOBAL_MUTEX(g_random_mutex);
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assert(maximum > 0);
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std::uniform_int_distribution<uint32_t> di(0, maximum-1);
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return std::chrono::milliseconds(di(g_random_engine));
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}
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}
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