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