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//===-- tsan_vector_clock.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.
//
//===----------------------------------------------------------------------===//
#ifndef TSAN_VECTOR_CLOCK_H
#define TSAN_VECTOR_CLOCK_H
#include "tsan_defs.h"
namespace __tsan {
// Fixed-size vector clock, used both for threads and sync objects.
class VectorClock {
public:
VectorClock();
Epoch Get(Sid sid) const;
void Set(Sid sid, Epoch v);
void Reset();
void Acquire(const VectorClock* src);
void Release(VectorClock** dstp) const;
void ReleaseStore(VectorClock** dstp) const;
void ReleaseStoreAcquire(VectorClock** dstp);
void ReleaseAcquire(VectorClock** dstp);
VectorClock& operator=(const VectorClock& other);
private:
Epoch clk_[kThreadSlotCount] VECTOR_ALIGNED;
};
ALWAYS_INLINE Epoch VectorClock::Get(Sid sid) const {
return clk_[static_cast<u8>(sid)];
}
ALWAYS_INLINE void VectorClock::Set(Sid sid, Epoch v) {
DCHECK_GE(v, clk_[static_cast<u8>(sid)]);
clk_[static_cast<u8>(sid)] = v;
}
} // namespace __tsan
#endif // TSAN_VECTOR_CLOCK_H
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