1//===-- tsan_mutexset.h -----------------------------------------*- C++ -*-===// 2// 3// This file is distributed under the University of Illinois Open Source 4// License. See LICENSE.TXT for details. 5// 6//===----------------------------------------------------------------------===// 7// 8// This file is a part of ThreadSanitizer (TSan), a race detector. 9// 10// MutexSet holds the set of mutexes currently held by a thread. 11//===----------------------------------------------------------------------===// 12#ifndef TSAN_MUTEXSET_H 13#define TSAN_MUTEXSET_H 14 15#include "tsan_defs.h" 16 17namespace __tsan { 18 19class MutexSet { 20 public: 21 // Holds limited number of mutexes. 22 // The oldest mutexes are discarded on overflow. 23 static const uptr kMaxSize = 16; 24 struct Desc { 25 u64 id; 26 u64 epoch; 27 int count; 28 bool write; 29 }; 30 31 MutexSet(); 32 // The 'id' is obtained from SyncVar::GetId(). 33 void Add(u64 id, bool write, u64 epoch); 34 void Del(u64 id, bool write); 35 void Remove(u64 id); // Removes the mutex completely (if it's destroyed). 36 uptr Size() const; 37 Desc Get(uptr i) const; 38 39 void operator=(const MutexSet &other) { 40 internal_memcpy(this, &other, sizeof(*this)); 41 } 42 43 private: 44#if !SANITIZER_GO 45 uptr size_; 46 Desc descs_[kMaxSize]; 47#endif 48 49 void RemovePos(uptr i); 50 MutexSet(const MutexSet&); 51}; 52 53// Go does not have mutexes, so do not spend memory and time. 54// (Go sync.Mutex is actually a semaphore -- can be unlocked 55// in different goroutine). 56#if SANITIZER_GO 57MutexSet::MutexSet() {} 58void MutexSet::Add(u64 id, bool write, u64 epoch) {} 59void MutexSet::Del(u64 id, bool write) {} 60void MutexSet::Remove(u64 id) {} 61void MutexSet::RemovePos(uptr i) {} 62uptr MutexSet::Size() const { return 0; } 63MutexSet::Desc MutexSet::Get(uptr i) const { return Desc(); } 64#endif 65 66} // namespace __tsan 67 68#endif // TSAN_MUTEXSET_H 69