lib/Support/ThreadLocal.cpp

   1 //===- ThreadLocal.cpp - Thread Local Data ----------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements the llvm::sys::ThreadLocal class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/Config/config.h"
  15 #include "llvm/Support/ThreadLocal.h"
  16
  17 //===----------------------------------------------------------------------===//
  18 //=== WARNING: Implementation here must contain only TRULY operating system
  19 //===          independent code.
  20 //===----------------------------------------------------------------------===//
  21
  22 #if !defined(ENABLE_THREADS) || 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() { }
  27 ThreadLocalImpl::~ThreadLocalImpl() { }
  28 void ThreadLocalImpl::setInstance(const void* d) { data = const_cast<void*>(d);}
  29 const void* ThreadLocalImpl::getInstance() { return data; }
  30 void ThreadLocalImpl::removeInstance() { data = 0; }
  31 }
  32 #else
  33
  34 #if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_GETSPECIFIC)
  35
  36 #include <cassert>
  37 #include <pthread.h>
  38 #include <stdlib.h>
  39
  40 namespace llvm {
  41 using namespace sys;
  42
  43 ThreadLocalImpl::ThreadLocalImpl() : data(0) {
  44   pthread_key_t* key = new pthread_key_t;
  45   int errorcode = pthread_key_create(key, NULL);
  46   assert(errorcode == 0);
  47   (void) errorcode;
  48   data = (void*)key;
  49 }
  50
  51 ThreadLocalImpl::~ThreadLocalImpl() {
  52   pthread_key_t* key = static_cast<pthread_key_t*>(data);
  53   int errorcode = pthread_key_delete(*key);
  54   assert(errorcode == 0);
  55   (void) errorcode;
  56   delete key;
  57 }
  58
  59 void ThreadLocalImpl::setInstance(const void* d) {
  60   pthread_key_t* key = static_cast<pthread_key_t*>(data);
  61   int errorcode = pthread_setspecific(*key, d);
  62   assert(errorcode == 0);
  63   (void) errorcode;
  64 }
  65
  66 const void* ThreadLocalImpl::getInstance() {
  67   pthread_key_t* key = static_cast<pthread_key_t*>(data);
  68   return pthread_getspecific(*key);
  69 }
  70
  71 void ThreadLocalImpl::removeInstance() {
  72   setInstance(0);
  73 }
  74
  75 }
  76
  77 #elif defined(LLVM_ON_UNIX)
  78 #include "Unix/ThreadLocal.inc"
  79 #elif defined( LLVM_ON_WIN32)
  80 #include "Windows/ThreadLocal.inc"
  81 #else
  82 #warning Neither LLVM_ON_UNIX nor LLVM_ON_WIN32 was set in System/ThreadLocal.cpp
  83 #endif
  84 #endif