1 //===-- tsan_vector_clock.h -------------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file is a part of ThreadSanitizer (TSan), a race detector. 10 // 11 //===----------------------------------------------------------------------===// 12 #ifndef TSAN_VECTOR_CLOCK_H 13 #define TSAN_VECTOR_CLOCK_H 14 15 #include "tsan_defs.h" 16 17 namespace __tsan { 18 19 // Fixed-size vector clock, used both for threads and sync objects. 20 class VectorClock { 21 public: 22 VectorClock(); 23 24 Epoch Get(Sid sid) const; 25 void Set(Sid sid, Epoch v); 26 27 void Reset(); 28 void Acquire(const VectorClock* src); 29 void Release(VectorClock** dstp) const; 30 void ReleaseStore(VectorClock** dstp) const; 31 void ReleaseStoreAcquire(VectorClock** dstp); 32 void ReleaseAcquire(VectorClock** dstp); 33 34 VectorClock& operator=(const VectorClock& other); 35 36 private: 37 VECTOR_ALIGNED Epoch clk_[kThreadSlotCount]; 38 }; 39 Get(Sid sid)40ALWAYS_INLINE Epoch VectorClock::Get(Sid sid) const { 41 return clk_[static_cast<u8>(sid)]; 42 } 43 Set(Sid sid,Epoch v)44ALWAYS_INLINE void VectorClock::Set(Sid sid, Epoch v) { 45 DCHECK_GE(v, clk_[static_cast<u8>(sid)]); 46 clk_[static_cast<u8>(sid)] = v; 47 } 48 49 } // namespace __tsan 50 51 #endif // TSAN_VECTOR_CLOCK_H 52