mirror of
https://github.com/jart/cosmopolitan.git
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51 lines
1.2 KiB
C++
51 lines
1.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include <algorithm>
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#include <random>
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#ifndef _LIBCPP_HAS_NO_THREADS
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# include <mutex>
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# if defined(__ELF__) && defined(_LIBCPP_LINK_PTHREAD_LIB)
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# pragma comment(lib, "pthread")
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# endif
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#ifndef _LIBCPP_HAS_NO_THREADS
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static constinit __libcpp_mutex_t __rs_mut = _LIBCPP_MUTEX_INITIALIZER;
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#endif
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unsigned __rs_default::__c_ = 0;
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__rs_default::__rs_default() {
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#ifndef _LIBCPP_HAS_NO_THREADS
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__libcpp_mutex_lock(&__rs_mut);
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#endif
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__c_ = 1;
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}
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__rs_default::__rs_default(const __rs_default&) { ++__c_; }
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__rs_default::~__rs_default() {
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#ifndef _LIBCPP_HAS_NO_THREADS
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if (--__c_ == 0)
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__libcpp_mutex_unlock(&__rs_mut);
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#else
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--__c_;
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#endif
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}
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__rs_default::result_type __rs_default::operator()() {
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static mt19937 __rs_g;
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return __rs_g();
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}
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__rs_default __rs_get() { return __rs_default(); }
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_LIBCPP_END_NAMESPACE_STD
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