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[rustc.git] / src / compiler-rt / lib / tsan / rtl / tsan_mutexset.h
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1//===-- tsan_mutexset.h -----------------------------------------*- C++ -*-===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file is a part of ThreadSanitizer (TSan), a race detector.
11//
12// MutexSet holds the set of mutexes currently held by a thread.
13//===----------------------------------------------------------------------===//
14#ifndef TSAN_MUTEXSET_H
15#define TSAN_MUTEXSET_H
16
17#include "tsan_defs.h"
18
19namespace __tsan {
20
21class MutexSet {
22 public:
23 // Holds limited number of mutexes.
24 // The oldest mutexes are discarded on overflow.
25 static const uptr kMaxSize = 16;
26 struct Desc {
27 u64 id;
28 u64 epoch;
29 int count;
30 bool write;
31 };
32
33 MutexSet();
34 // The 'id' is obtained from SyncVar::GetId().
35 void Add(u64 id, bool write, u64 epoch);
36 void Del(u64 id, bool write);
37 void Remove(u64 id); // Removes the mutex completely (if it's destroyed).
38 uptr Size() const;
39 Desc Get(uptr i) const;
40
41 void operator=(const MutexSet &other) {
42 internal_memcpy(this, &other, sizeof(*this));
43 }
44
45 private:
92a42be0 46#ifndef SANITIZER_GO
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47 uptr size_;
48 Desc descs_[kMaxSize];
49#endif
50
51 void RemovePos(uptr i);
52 MutexSet(const MutexSet&);
53};
54
55// Go does not have mutexes, so do not spend memory and time.
56// (Go sync.Mutex is actually a semaphore -- can be unlocked
57// in different goroutine).
92a42be0 58#ifdef SANITIZER_GO
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59MutexSet::MutexSet() {}
60void MutexSet::Add(u64 id, bool write, u64 epoch) {}
61void MutexSet::Del(u64 id, bool write) {}
62void MutexSet::Remove(u64 id) {}
63void MutexSet::RemovePos(uptr i) {}
64uptr MutexSet::Size() const { return 0; }
65MutexSet::Desc MutexSet::Get(uptr i) const { return Desc(); }
66#endif
67
68} // namespace __tsan
69
70#endif // TSAN_MUTEXSET_H