libc/src/stdlib/rand_util.cpp

   1 //===-- Shared utility for rand -------------------------------------------===//
   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 #include "src/stdlib/rand_util.h"
  10 #include "src/__support/macros/attributes.h"
  11
  12 namespace LIBC_NAMESPACE {
  13
  14 #ifdef LIBC_TARGET_ARCH_IS_GPU
  15 // FIXME: Local GPU memory cannot be initialized so we cannot currently provide
  16 // a standard compliant default value.
  17 ThreadLocal<unsigned long> rand_next;
  18 #else
  19 // C standard 7.10p2: If 'rand' is called before 'srand' it is to proceed as if
  20 // the 'srand' function was called with a value of '1'.
  21 LIBC_THREAD_LOCAL unsigned long rand_next = 1;
  22 #endif
  23
  24 } // namespace LIBC_NAMESPACE