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