blob: a57a0e4f791e7b09e86a730f16fd83de3a177fa8 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
//===-- tsan_clock.h --------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer (TSan), a race detector.
//
//===----------------------------------------------------------------------===//
#ifndef TSAN_CLOCK_H
#define TSAN_CLOCK_H
#include "tsan_defs.h"
#include "tsan_vector.h"
namespace __tsan {
const u64 kClkMask = (1ULL << kClkBits) - 1;
// The clock that lives in sync variables (mutexes, atomics, etc).
class SyncClock {
public:
SyncClock();
uptr size() const {
return clk_.Size();
}
u64 get(unsigned tid) const {
DCHECK_LT(tid, clk_.Size());
return clk_[tid] & kClkMask;
}
void Reset();
void DebugDump(int(*printf)(const char *s, ...));
private:
u64 release_seq_;
unsigned release_store_tid_;
static const uptr kDirtyTids = 2;
unsigned dirty_tids_[kDirtyTids];
mutable Vector<u64> clk_;
friend struct ThreadClock;
};
// The clock that lives in threads.
struct ThreadClock {
public:
explicit ThreadClock(unsigned tid);
u64 get(unsigned tid) const {
DCHECK_LT(tid, kMaxTidInClock);
DCHECK_EQ(clk_[tid], clk_[tid] & kClkMask);
return clk_[tid];
}
void set(unsigned tid, u64 v);
void set(u64 v) {
DCHECK_GE(v, clk_[tid_]);
clk_[tid_] = v;
}
void tick() {
clk_[tid_]++;
}
uptr size() const {
return nclk_;
}
void acquire(const SyncClock *src);
void release(SyncClock *dst) const;
void acq_rel(SyncClock *dst);
void ReleaseStore(SyncClock *dst) const;
void DebugDump(int(*printf)(const char *s, ...));
private:
static const uptr kDirtyTids = SyncClock::kDirtyTids;
const unsigned tid_;
u64 last_acquire_;
uptr nclk_;
u64 clk_[kMaxTidInClock];
bool IsAlreadyAcquired(const SyncClock *src) const;
void UpdateCurrentThread(SyncClock *dst) const;
};
} // namespace __tsan
#endif // TSAN_CLOCK_H
|
