lib/System/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/System/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 }
  31 #else
  32
  33 #if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_GETSPECIFIC)
  34
  35 #include <cassert>
  36 #include <pthread.h>
  37 #include <stdlib.h>
  38
  39 namespace llvm {
  40 using namespace sys;
  41
  42 ThreadLocalImpl::ThreadLocalImpl() : data(0) {
  43   pthread_key_t* key = new pthread_key_t;
  44   int errorcode = pthread_key_create(key, NULL);
  45   assert(errorcode == 0);
  46   (void) errorcode;
  47   data = (void*)key;
  48 }
  49
  50 ThreadLocalImpl::~ThreadLocalImpl() {
  51   pthread_key_t* key = static_cast<pthread_key_t*>(data);
  52   int errorcode = pthread_key_delete(*key);
  53   assert(errorcode == 0);
  54   (void) errorcode;
  55   delete key;
  56 }
  57
  58 void ThreadLocalImpl::setInstance(const void* d) {
  59   pthread_key_t* key = static_cast<pthread_key_t*>(data);
  60   int errorcode = pthread_setspecific(*key, d);
  61   assert(errorcode == 0);
  62   (void) errorcode;
  63 }
  64
  65 const void* ThreadLocalImpl::getInstance() {
  66   pthread_key_t* key = static_cast<pthread_key_t*>(data);
  67   return pthread_getspecific(*key);
  68 }
  69
  70 }
  71
  72 #elif defined(LLVM_ON_UNIX)
  73 #include "Unix/ThreadLocal.inc"
  74 #elif defined( LLVM_ON_WIN32)
  75 #include "Win32/ThreadLocal.inc"
  76 #else
  77 #warning Neither LLVM_ON_UNIX nor LLVM_ON_WIN32 was set in System/ThreadLocal.cpp
  78 #endif
  79 #endif
  80