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//===--- ThreadSanitizer.cpp - Thread Sanitizer support -------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2023 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
//
//===----------------------------------------------------------------------===//
//
// Helper functions for code that needs to integrate with the thread
// sanitizer. In particular, TSan can't see inside the runtime libraries,
// so we occasionally need to give it a hint that we're doing synchronization
// in order to avoid false positives.
//
//===----------------------------------------------------------------------===//
#include "swift/Threading/ThreadSanitizer.h"
#if SWIFT_THREADING_TSAN_SUPPORT
#include "swift/shims/Visibility.h"
#include <dlfcn.h>
#include <cstdio>
namespace swift {
namespace threading_impl {
SWIFT_THREADING_EXPORT bool _swift_tsan_enabled = false;
SWIFT_THREADING_EXPORT void (*_swift_tsan_acquire)(const void *) = nullptr;
SWIFT_THREADING_EXPORT void (*_swift_tsan_release)(const void *) = nullptr;
// The TSan library code will call this function when it starts up
extern "C" SWIFT_ATTRIBUTE_FOR_EXPORTS
void __tsan_on_initialize() {
_swift_tsan_enabled = true;
_swift_tsan_acquire = (void (*)(const void *))dlsym(RTLD_DEFAULT,
"__tsan_acquire");
_swift_tsan_release = (void (*)(const void *))dlsym(RTLD_DEFAULT,
"__tsan_release");
// Always call through to the next image; this won't work on macOS, but it's
// important on Linux to allow others to hook into the thread sanitizer if
// they wish.
void (*next_init)(void);
next_init = (void (*)(void))dlsym(RTLD_NEXT, "__tsan_on_initialize");
if (next_init) {
next_init();
}
}
} // namespace threading_impl
} // namespace swift
#endif // SWIFT_THREADING_TSAN_SUPPORT
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