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94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
//===- ThreadLocal.cpp - Thread Local Data ----------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the llvm::sys::ThreadLocal class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Config/config.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/ThreadLocal.h"
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only TRULY operating system
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//=== independent code.
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//===----------------------------------------------------------------------===//
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#if !defined(LLVM_ENABLE_THREADS) || LLVM_ENABLE_THREADS == 0
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// Define all methods as no-ops if threading is explicitly disabled
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namespace llvm {
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using namespace sys;
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ThreadLocalImpl::ThreadLocalImpl() : data() { }
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ThreadLocalImpl::~ThreadLocalImpl() { }
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void ThreadLocalImpl::setInstance(const void* d) {
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static_assert(sizeof(d) <= sizeof(data), "size too big");
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void **pd = reinterpret_cast<void**>(&data);
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*pd = const_cast<void*>(d);
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}
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const void* ThreadLocalImpl::getInstance() {
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void **pd = reinterpret_cast<void**>(&data);
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return *pd;
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}
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void ThreadLocalImpl::removeInstance() {
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setInstance(0);
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}
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}
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#else
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#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_GETSPECIFIC)
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#include <cassert>
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#include <pthread.h>
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#include <stdlib.h>
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namespace llvm {
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using namespace sys;
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ThreadLocalImpl::ThreadLocalImpl() : data() {
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static_assert(sizeof(pthread_key_t) <= sizeof(data), "size too big");
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pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
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int errorcode = pthread_key_create(key, nullptr);
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assert(errorcode == 0);
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(void) errorcode;
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}
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ThreadLocalImpl::~ThreadLocalImpl() {
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pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
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int errorcode = pthread_key_delete(*key);
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assert(errorcode == 0);
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(void) errorcode;
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}
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void ThreadLocalImpl::setInstance(const void* d) {
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pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
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int errorcode = pthread_setspecific(*key, d);
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assert(errorcode == 0);
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(void) errorcode;
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}
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const void* ThreadLocalImpl::getInstance() {
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pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
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return pthread_getspecific(*key);
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}
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void ThreadLocalImpl::removeInstance() {
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setInstance(nullptr);
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}
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}
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#elif defined(LLVM_ON_UNIX)
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#include "Unix/ThreadLocal.inc"
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#elif defined( LLVM_ON_WIN32)
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#include "Windows/ThreadLocal.inc"
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#else
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#warning Neither LLVM_ON_UNIX nor LLVM_ON_WIN32 set in Support/ThreadLocal.cpp
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#endif
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#endif
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