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