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f5bdb858e0
Moved all the threading code to one place. Added explicit support for Darwin, Linux, Pthreads, C11 threads and Win32 threads, including new implementations of Once for Linux, Pthreads, C11 and Win32. rdar://90776105
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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