138b6f58eSMichael Jones //===-- Implementation header for rand utilities ----------------*- C++ -*-===// 238b6f58eSMichael Jones // 338b6f58eSMichael Jones // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 438b6f58eSMichael Jones // See https://llvm.org/LICENSE.txt for license information. 538b6f58eSMichael Jones // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 638b6f58eSMichael Jones // 738b6f58eSMichael Jones //===----------------------------------------------------------------------===// 838b6f58eSMichael Jones 938b6f58eSMichael Jones #ifndef LLVM_LIBC_SRC_STDLIB_RAND_UTIL_H 1038b6f58eSMichael Jones #define LLVM_LIBC_SRC_STDLIB_RAND_UTIL_H 1138b6f58eSMichael Jones 1286860be2SJoseph Huber #include "src/__support/CPP/atomic.h" 13daeee567SSiva Chandra Reddy #include "src/__support/macros/attributes.h" 14*5ff3ff33SPetr Hosek #include "src/__support/macros/config.h" 15daeee567SSiva Chandra Reddy 16*5ff3ff33SPetr Hosek namespace LIBC_NAMESPACE_DECL { 1738b6f58eSMichael Jones 1886860be2SJoseph Huber // The ISO C standard does not explicitly require thread-safe behavior for the 1986860be2SJoseph Huber // generic `rand()` function. Some implementations expect it however, so we 2086860be2SJoseph Huber // provide it here. 2186860be2SJoseph Huber extern cpp::Atomic<unsigned long> rand_next; 2238b6f58eSMichael Jones 23*5ff3ff33SPetr Hosek } // namespace LIBC_NAMESPACE_DECL 2438b6f58eSMichael Jones 2538b6f58eSMichael Jones #endif // LLVM_LIBC_SRC_STDLIB_RAND_UTIL_H 26