89 lines
2.0 KiB
C++
89 lines
2.0 KiB
C++
//===-- tsan_mutexset.cpp -------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file is a part of ThreadSanitizer (TSan), a race detector.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
#include "tsan_mutexset.h"
|
|
#include "tsan_rtl.h"
|
|
|
|
namespace __tsan {
|
|
|
|
const uptr MutexSet::kMaxSize;
|
|
|
|
MutexSet::MutexSet() {
|
|
size_ = 0;
|
|
internal_memset(&descs_, 0, sizeof(descs_));
|
|
}
|
|
|
|
void MutexSet::Add(u64 id, bool write, u64 epoch) {
|
|
// Look up existing mutex with the same id.
|
|
for (uptr i = 0; i < size_; i++) {
|
|
if (descs_[i].id == id) {
|
|
descs_[i].count++;
|
|
descs_[i].epoch = epoch;
|
|
return;
|
|
}
|
|
}
|
|
// On overflow, find the oldest mutex and drop it.
|
|
if (size_ == kMaxSize) {
|
|
u64 minepoch = (u64)-1;
|
|
u64 mini = (u64)-1;
|
|
for (uptr i = 0; i < size_; i++) {
|
|
if (descs_[i].epoch < minepoch) {
|
|
minepoch = descs_[i].epoch;
|
|
mini = i;
|
|
}
|
|
}
|
|
RemovePos(mini);
|
|
CHECK_EQ(size_, kMaxSize - 1);
|
|
}
|
|
// Add new mutex descriptor.
|
|
descs_[size_].id = id;
|
|
descs_[size_].write = write;
|
|
descs_[size_].epoch = epoch;
|
|
descs_[size_].count = 1;
|
|
size_++;
|
|
}
|
|
|
|
void MutexSet::Del(u64 id, bool write) {
|
|
for (uptr i = 0; i < size_; i++) {
|
|
if (descs_[i].id == id) {
|
|
if (--descs_[i].count == 0)
|
|
RemovePos(i);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
void MutexSet::Remove(u64 id) {
|
|
for (uptr i = 0; i < size_; i++) {
|
|
if (descs_[i].id == id) {
|
|
RemovePos(i);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
void MutexSet::RemovePos(uptr i) {
|
|
CHECK_LT(i, size_);
|
|
descs_[i] = descs_[size_ - 1];
|
|
size_--;
|
|
}
|
|
|
|
uptr MutexSet::Size() const {
|
|
return size_;
|
|
}
|
|
|
|
MutexSet::Desc MutexSet::Get(uptr i) const {
|
|
CHECK_LT(i, size_);
|
|
return descs_[i];
|
|
}
|
|
|
|
} // namespace __tsan
|