mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
eb4c81d60e
There's no guarantee that e.g. pthread_key_t is an integral type. It could be some kind of struct, or some other thing that isn't valid as a template argument. rdar://90776105
68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
//===--- 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 "SwiftShims/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
|
|
}
|