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//===-- tsan_clock.h --------------------------------------------*- C++ -*-===//
//
// 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 {
// The clock that lives in sync variables (mutexes, atomics, etc).
class SyncClock {
public:
SyncClock();
uptr size() const {
return clk_.Size();
}
void Reset() {
clk_.Reset();
}
private:
Vector<u64> clk_;
friend struct ThreadClock;
};
// The clock that lives in threads.
struct ThreadClock {
public:
ThreadClock();
u64 get(unsigned tid) const {
DCHECK_LT(tid, kMaxTidInClock);
return clk_[tid];
}
void set(unsigned tid, u64 v) {
DCHECK_LT(tid, kMaxTid);
DCHECK_GE(v, clk_[tid]);
clk_[tid] = v;
if (nclk_ <= tid)
nclk_ = tid + 1;
}
void tick(unsigned tid) {
DCHECK_LT(tid, kMaxTid);
clk_[tid]++;
if (nclk_ <= tid)
nclk_ = tid + 1;
}
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;
private:
uptr nclk_;
u64 clk_[kMaxTidInClock];
};
} // namespace __tsan
#endif // TSAN_CLOCK_H
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