1 //===-- Implementation header for rand utilities ----------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef LLVM_LIBC_SRC_STDLIB_RAND_UTIL_H 10 #define LLVM_LIBC_SRC_STDLIB_RAND_UTIL_H 11 12 #include "src/__support/CPP/atomic.h" 13 #include "src/__support/macros/attributes.h" 14 #include "src/__support/macros/config.h" 15 16 namespace LIBC_NAMESPACE_DECL { 17 18 // The ISO C standard does not explicitly require thread-safe behavior for the 19 // generic `rand()` function. Some implementations expect it however, so we 20 // provide it here. 21 extern cpp::Atomic<unsigned long> rand_next; 22 23 } // namespace LIBC_NAMESPACE_DECL 24 25 #endif // LLVM_LIBC_SRC_STDLIB_RAND_UTIL_H 26