//=== llvm/Support/Unix/ThreadLocal.inc - Unix Thread Local Data -*- C++ -*-===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

//

// This file implements the Unix specific (non-pthread) ThreadLocal class.

//

//===----------------------------------------------------------------------===//

//===----------------------------------------------------------------------===//

//=== WARNING: Implementation here must contain only generic UNIX code that

//===          is guaranteed to work on *all* UNIX variants.

//===----------------------------------------------------------------------===//

#include "llvm/Config/config.h"

#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_GETSPECIFIC)

#include <cassert>

#include <pthread.h>

#include <stdlib.h>

namespace llvm {

using namespace sys;

ThreadLocalImpl::ThreadLocalImpl() : data() {

  static_assert(sizeof(pthread_key_t) <= sizeof(data), "size too big");

  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);

  int errorcode = pthread_key_create(key, nullptr);

  assert(errorcode == 0);

  (void) errorcode;

}

ThreadLocalImpl::~ThreadLocalImpl() {

  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);

  int errorcode = pthread_key_delete(*key);

  assert(errorcode == 0);

  (void) errorcode;

}

void ThreadLocalImpl::setInstance(const void* d) {

  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);

  int errorcode = pthread_setspecific(*key, d);

  assert(errorcode == 0);

  (void) errorcode;

}

void *ThreadLocalImpl::getInstance() {

  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);

  return pthread_getspecific(*key);

}

void ThreadLocalImpl::removeInstance() {

  setInstance(nullptr);

}

}

#else

namespace llvm {

using namespace sys;

ThreadLocalImpl::ThreadLocalImpl() : data() { }

ThreadLocalImpl::~ThreadLocalImpl() { }

void ThreadLocalImpl::setInstance(const void* d) { data = const_cast<void*>(d);}

void *ThreadLocalImpl::getInstance() { return data; }

void ThreadLocalImpl::removeInstance() { setInstance(0); }

}

#endif