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//
// Copyright (c) 2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// tls.h: Simple cross-platform interface for thread local storage.
#ifndef COMMON_TLS_H_
#define COMMON_TLS_H_
#include "common/platform.h"
#ifdef ANGLE_PLATFORM_WINDOWS
// TLS does not exist for Windows Store and needs to be emulated
# ifdef ANGLE_ENABLE_WINDOWS_STORE
# ifndef TLS_OUT_OF_INDEXES
# define TLS_OUT_OF_INDEXES static_cast<DWORD>(0xFFFFFFFF)
# endif
# ifndef CREATE_SUSPENDED
# define CREATE_SUSPENDED 0x00000004
# endif
# endif
typedef DWORD TLSIndex;
# define TLS_INVALID_INDEX (TLS_OUT_OF_INDEXES)
#elif defined(ANGLE_PLATFORM_POSIX)
# include <pthread.h>
# include <semaphore.h>
# include <errno.h>
typedef pthread_key_t TLSIndex;
# define TLS_INVALID_INDEX (static_cast<TLSIndex>(-1))
#else
# error Unsupported platform.
#endif
// TODO(kbr): for POSIX platforms this will have to be changed to take
// in a destructor function pointer, to allow the thread-local storage
// to be properly deallocated upon thread exit.
TLSIndex CreateTLSIndex();
bool DestroyTLSIndex(TLSIndex index);
bool SetTLSValue(TLSIndex index, void *value);
void *GetTLSValue(TLSIndex index);
#endif // COMMON_TLS_H_
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