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41f46ec085
Move the TSan functionality from Concurrency into Threading. Use it in the Linux `ulock` implementation so that TSan knows about `ulock` and will tolerate the newer `swift_once` implementation that uses it. rdar://110665213
50 lines
1.7 KiB
C++
50 lines
1.7 KiB
C++
//===--- TSan.h - TSan support functions ----------------------------------===//
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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) 2023 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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// Helper functions for code that needs to integrate with the thread
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// sanitizer. In particular, TSan can't see inside the runtime libraries,
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// so we occasionally need to give it a hint that we're doing synchronization
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// in order to avoid false positives.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/Threading/TSan.h"
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#include "swift/shims/Visibility.h"
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namespace swift {
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namespace threading_impl {
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bool tsan_enabled = false;
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void (*tsan_acquire)(const void *) = nullptr;
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void (*tsan_release)(const void *) = nullptr;
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#if __has_include(<dlfcn.h>)
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#include <dlfcn.h>
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// The TSan library code will call this function when it starts up
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extern "C" SWIFT_ATTRIBUTE_FOR_EXPORTS
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void __tsan_on_initialize() {
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tsan_enabled = true;
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tsan_acquire = (void (*)(const void *))dlsym(RTLD_DEFAULT, "__tsan_acquire");
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tsan_release = (void (*)(const void *))dlsym(RTLD_DEFAULT, "__tsan_release");
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// Always call through to the next image
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void (*next_init)(void);
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next_init = (void (*)(void))dlsym(RTLD_NEXT, "__tsan_on_initialize");
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if (next_init)
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next_init();
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}
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#endif
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} // namespace threading_impl
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} // namespace swift
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