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dadcb04ae2
SWIFT_STDLIB_SINGLE_THREADED_RUNTIME is too much of a blunt instrument here. It covers both the Concurrency runtime and the rest of the runtime, but we'd like to be able to have e.g. a single-threaded Concurrency runtime while the rest of the runtime is still thread safe (for instance). So: rename it to SWIFT_STDLIB_SINGLE_THREADED_CONCURRENCY and make it just control the Concurrency runtime, then add a SWIFT_STDLIB_THREADING_PACKAGE setting at the CMake/build-script level, which defines SWIFT_STDLIB_THREADING_xxx where xxx depends on the chosen threading package. This is especially useful on systems where there may be a choice of threading package that you could use. rdar://90776105
92 lines
2.4 KiB
C++
92 lines
2.4 KiB
C++
//===--- SwiftTLSContext.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 - 2021 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 "SwiftTLSContext.h"
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#include "swift/Basic/Lazy.h"
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#include "swift/Runtime/Once.h"
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#include "swift/Runtime/ThreadLocalStorage.h"
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using namespace swift;
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using namespace swift::runtime;
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#ifdef SWIFT_STDLIB_THREADING_NONE
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SwiftTLSContext &SwiftTLSContext::get() {
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static SwiftTLSContext TLSContext;
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return TLSContext;
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}
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#elif SWIFT_TLS_HAS_RESERVED_PTHREAD_SPECIFIC
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// Use the reserved TSD key if possible.
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SwiftTLSContext &SwiftTLSContext::get() {
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SwiftTLSContext *ctx = static_cast<SwiftTLSContext *>(
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SWIFT_THREAD_GETSPECIFIC(SWIFT_RUNTIME_TLS_KEY));
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if (ctx)
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return *ctx;
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static OnceToken_t setupToken;
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SWIFT_ONCE_F(
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setupToken,
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[](void *) {
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SWIFT_THREAD_KEY_INIT(SWIFT_RUNTIME_TLS_KEY, [](void *pointer) {
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delete static_cast<SwiftTLSContext *>(pointer);
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});
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},
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nullptr);
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ctx = new SwiftTLSContext();
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SWIFT_THREAD_SETSPECIFIC(SWIFT_RUNTIME_TLS_KEY, ctx);
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return *ctx;
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}
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#elif __has_feature(cxx_thread_local)
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// Second choice is direct language support for thread-locals.
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namespace {
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static thread_local SwiftTLSContext TLSContext;
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} // anonymous namespace
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SwiftTLSContext &SwiftTLSContext::get() { return TLSContext; }
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#else
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// Use the platform thread-local data API.
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static __swift_thread_key_t createSwiftThreadKey() {
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__swift_thread_key_t key;
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int result = SWIFT_THREAD_KEY_CREATE(&key, [](void *pointer) {
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delete static_cast<SwiftTLSContext *>(pointer);
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});
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if (result != 0) {
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fatalError(0, "couldn't create thread key for exclusivity: %s\n",
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strerror(result));
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}
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return key;
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}
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static SwiftTLSContext &getTLSContext() {
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static __swift_thread_key_t key = createSwiftThreadKey();
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SwiftTLSContext *ctx =
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static_cast<SwiftTLSContext *>(SWIFT_THREAD_GETSPECIFIC(key));
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if (!ctx) {
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ctx = new SwiftTLSContext();
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SWIFT_THREAD_SETSPECIFIC(key, ctx);
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}
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return *ctx;
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}
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#endif
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