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[Threading] Fix some problems with the C11 threading code.

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These changes are needed to get things building with a C11 threads shim
header on macOS.

rdar://90776105
This commit is contained in:
Alastair Houghton
2022-04-29 17:48:45 +01:00
parent 0e9318cec5
commit c7c1c1be80
15 changed files with 136 additions and 51 deletions
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20
include/swift/Threading/ThreadLocalStorage.h
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@@ -86,20 +86,18 @@ inline void tls_alloc_once(once_t &token, tls_key &key, tls_dtor dtor) {
// A wrapper class for thread-local storage.
//
// - On platforms that report SWIFT_RUNTIME_SUPPORTS_THREAD_LOCAL
// above, an object of this type is declared with
// SWIFT_RUNTIME_ATTRIBUTE_THREAD_LOCAL. This makes the object
// - On platforms that define SWIFT_THREAD_LOCAL, an object of this type
// is declared with SWIFT_THREAD_LOCAL. This makes the object
// itself thread-local, and no internal support is required.
//
// Note that this includes platforms that don't support threading,
// for which SWIFT_RUNTIME_ATTRIBUTE_THREAD_LOCAL is empty;
// thread-local declarations then create an ordinary global.
// for which SWIFT_THREAD_LOCAL is empty; thread-local declarations
// then create an ordinary global.
//
// - On platforms that don't report SWIFT_RUNTIME_SUPPORTS_THREAD_LOCAL,
// we have to simulate thread-local storage. Fortunately, all of
// these platforms (at least for now) support pthread_getspecific
// or similar.
#if SWIFT_THREAD_LOCAL
// - On platforms that don't define SWIFT_THREAD_LOCAL, we have to simulate
// thread-local storage. Fortunately, all of these platforms (at least
// for now) support pthread_getspecific or similar.
#ifdef SWIFT_THREAD_LOCAL
template <class T>
class ThreadLocal {
VALIDATE_THREAD_LOCAL_TYPE(T)
@@ -179,7 +177,7 @@ public:
/// Because of the fallback path, the default-initialization of the
/// type must be equivalent to a bitwise zero-initialization, and the
/// type must be small and trivially copyable and destructible.
#if SWIFT_THREAD_LOCAL
#ifdef SWIFT_THREAD_LOCAL
#define SWIFT_THREAD_LOCAL_TYPE(TYPE, KEY) \
SWIFT_THREAD_LOCAL swift::ThreadLocal<TYPE>
#elif SWIFT_THREADING_USE_RESERVED_TLS_KEYS