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70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
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//===-- tsan_mutexset.h -----------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of ThreadSanitizer (TSan), a race detector.
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//
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// MutexSet holds the set of mutexes currently held by a thread.
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//===----------------------------------------------------------------------===//
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#ifndef TSAN_MUTEXSET_H
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#define TSAN_MUTEXSET_H
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#include "tsan_defs.h"
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namespace __tsan {
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class MutexSet {
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public:
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// Holds limited number of mutexes.
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// The oldest mutexes are discarded on overflow.
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static const uptr kMaxSize = 16;
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struct Desc {
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u64 id;
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u64 epoch;
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int count;
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bool write;
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};
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MutexSet();
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// The 'id' is obtained from SyncVar::GetId().
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void Add(u64 id, bool write, u64 epoch);
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void Del(u64 id, bool write);
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void Remove(u64 id); // Removes the mutex completely (if it's destroyed).
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uptr Size() const;
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Desc Get(uptr i) const;
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void operator=(const MutexSet &other) {
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internal_memcpy(this, &other, sizeof(*this));
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}
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private:
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#if !SANITIZER_GO
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uptr size_;
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Desc descs_[kMaxSize];
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#endif
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void RemovePos(uptr i);
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MutexSet(const MutexSet&);
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};
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// Go does not have mutexes, so do not spend memory and time.
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// (Go sync.Mutex is actually a semaphore -- can be unlocked
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// in different goroutine).
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#if SANITIZER_GO
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MutexSet::MutexSet() {}
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void MutexSet::Add(u64 id, bool write, u64 epoch) {}
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void MutexSet::Del(u64 id, bool write) {}
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void MutexSet::Remove(u64 id) {}
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void MutexSet::RemovePos(uptr i) {}
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uptr MutexSet::Size() const { return 0; }
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MutexSet::Desc MutexSet::Get(uptr i) const { return Desc(); }
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#endif
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} // namespace __tsan
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#endif // TSAN_MUTEXSET_H
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