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 17 namespace __tsan { 18 19 class MutexSet { 20 public: 21 // Holds limited number of mutexes. 22 // The oldest mutexes are discarded on overflow. 23 static const uptr kMaxSize = 64; 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 private: 40 #ifndef TSAN_GO 41 uptr size_; 42 Desc descs_[kMaxSize]; 43 #endif 44 45 void RemovePos(uptr i); 46 }; 47 48 // Go does not have mutexes, so do not spend memory and time. 49 // (Go sync.Mutex is actually a semaphore -- can be unlocked 50 // in different goroutine). 51 #ifdef TSAN_GO 52 MutexSet::MutexSet() {} 53 void MutexSet::Add(u64 id, bool write, u64 epoch) {} 54 void MutexSet::Del(u64 id, bool write) {} 55 void MutexSet::Remove(u64 id) {} 56 void MutexSet::RemovePos(uptr i) {} 57 uptr MutexSet::Size() const { return 0; } 58 MutexSet::Desc MutexSet::Get(uptr i) const { return Desc(); } 59 #endif 60 61 } // namespace __tsan 62 63 #endif // TSAN_REPORT_H 64