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63a09007a1
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
68 lines
1.7 KiB
C++
68 lines
1.7 KiB
C++
//==--- Linux.cpp - Threading abstraction implementation ------- -*-C++ -*-===//
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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) 2022 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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//
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// Implements threading support for Linux
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//
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//===----------------------------------------------------------------------===//
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#if SWIFT_THREADING_LINUX
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#include "swift/Threading/Errors.h"
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#include "swift/Threading/Impl/Linux.h"
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namespace {
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#pragma clang diagnostic push
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#pragma GCC diagnostic ignored "-Wglobal-constructors"
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class MainThreadRememberer {
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private:
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pthread_t mainThread_;
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public:
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MainThreadRememberer() { mainThread_ = pthread_self(); }
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pthread_t main_thread() const { return mainThread_; }
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};
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MainThreadRememberer rememberer;
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#pragma clang diagnostic pop
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}
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using namespace swift;
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using namespace threading_impl;
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thread_id
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swift::threading_impl::thread_get_main() {
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return rememberer.main_thread();
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}
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bool
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swift::threading_impl::thread_is_main() {
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return pthread_equal(pthread_self(), thread_get_main());
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}
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void
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swift::threading_impl::once_slow(once_t &predicate,
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void (*fn)(void *),
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void *context) {
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linux::ulock_lock(&predicate.lock);
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if (predicate.flag.load(std::memory_order_acquire) == 0) {
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fn(context);
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predicate.flag.store(-1, std::memory_order_release);
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}
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linux::ulock_unlock(&predicate.lock);
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}
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#endif // SWIFT_THREADING_PTHREADS
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