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