lib/Support/ThreadLocal.cpp

   1 //===- ThreadLocal.cpp - Thread Local Data ----------------------*- 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 // This file implements the llvm::sys::ThreadLocal class.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "llvm/Support/ThreadLocal.h"
  14 #include "llvm/Config/llvm-config.h"
  15 #include "llvm/Support/Compiler.h"
  16
  17 //===----------------------------------------------------------------------===//
  18 //=== WARNING: Implementation here must contain only TRULY operating system
  19 //===          independent code.
  20 //===----------------------------------------------------------------------===//
  21
  22 #if !defined(LLVM_ENABLE_THREADS) || LLVM_ENABLE_THREADS == 0
  23 // Define all methods as no-ops if threading is explicitly disabled
  24 namespace llvm {
  25 using namespace sys;
  26 ThreadLocalImpl::ThreadLocalImpl() : data() { }
  27 ThreadLocalImpl::~ThreadLocalImpl() { }
  28 void ThreadLocalImpl::setInstance(const void* d) {
  29   static_assert(sizeof(d) <= sizeof(data), "size too big");
  30   void **pd = reinterpret_cast<void**>(&data);
  31   *pd = const_cast<void*>(d);
  32 }
  33 void *ThreadLocalImpl::getInstance() {
  34   void **pd = reinterpret_cast<void**>(&data);
  35   return *pd;
  36 }
  37 void ThreadLocalImpl::removeInstance() {
  38   setInstance(nullptr);
  39 }
  40 }
  41 #elif defined(LLVM_ON_UNIX)
  42 #include "Unix/ThreadLocal.inc"
  43 #elif defined( _WIN32)
  44 #include "Windows/ThreadLocal.inc"
  45 #else
  46 #warning Neither LLVM_ON_UNIX nor _WIN32 set in Support/ThreadLocal.cpp
  47 #endif