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//===--- ThreadLocalStorage.cpp -------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include <cstring>
#include "swift/shims/ThreadLocalStorage.h"
#include "swift/Runtime/Debug.h"
#include "swift/Threading/ThreadLocalStorage.h"
SWIFT_CC(swift) SWIFT_RUNTIME_STDLIB_API
void _stdlib_destroyTLS(void *);
SWIFT_CC(swift) SWIFT_RUNTIME_STDLIB_API
void *_stdlib_createTLS(void);
SWIFT_RUNTIME_STDLIB_INTERNAL
void *
_swift_stdlib_threadLocalStorageGet(void) {
#if SWIFT_THREADING_NONE
// If there's no threading, we can just keep a static variable.
static void *value = _stdlib_createTLS();
return value;
#elif SWIFT_THREADING_USE_RESERVED_TLS_KEYS
// If we have reserved keys, use those
void *value = swift::tls_get(swift::tls_key::stdlib);
if (value)
return value;
static swift::once_t token;
swift::tls_init_once(token, swift::tls_key::stdlib,
[](void *pointer) { _stdlib_destroyTLS(pointer); });
value = _stdlib_createTLS();
swift::tls_set(swift::tls_key::stdlib, value);
return value;
#else // Threaded, but not using reserved keys
// Register a key and use it
static swift::tls_key_t key;
static swift::once_t token;
swift::tls_alloc_once(token, key,
[](void *pointer) { _stdlib_destroyTLS(pointer); });
void *value = swift::tls_get(key);
if (!value) {
value = _stdlib_createTLS();
swift::tls_set(key, value);
}
return value;
#endif
}
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