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