98 lines
2.8 KiB
C++
98 lines
2.8 KiB
C++
//===-- tsan_mutexset.h -----------------------------------------*- C++ -*-===//
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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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// MutexSet holds the set of mutexes currently held by a thread.
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//===----------------------------------------------------------------------===//
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#ifndef TSAN_MUTEXSET_H
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#define TSAN_MUTEXSET_H
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#include "tsan_defs.h"
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namespace __tsan {
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class MutexSet {
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public:
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// Holds limited number of mutexes.
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// The oldest mutexes are discarded on overflow.
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static constexpr uptr kMaxSize = 16;
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struct Desc {
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uptr addr;
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StackID stack_id;
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u64 id;
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u64 epoch;
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u32 seq;
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u32 count;
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bool write;
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Desc() { internal_memset(this, 0, sizeof(*this)); }
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Desc(const Desc& other) { *this = other; }
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Desc& operator=(const MutexSet::Desc& other) {
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internal_memcpy(this, &other, sizeof(*this));
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return *this;
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}
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};
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MutexSet();
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// The 'id' is obtained from SyncVar::GetId().
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void Add(u64 id, bool write, u64 epoch);
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void Del(u64 id, bool write);
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void Remove(u64 id); // Removes the mutex completely (if it's destroyed).
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void AddAddr(uptr addr, StackID stack_id, bool write);
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void DelAddr(uptr addr, bool destroy = false);
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uptr Size() const;
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Desc Get(uptr i) const;
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private:
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#if !SANITIZER_GO
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u32 seq_ = 0;
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uptr size_ = 0;
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Desc descs_[kMaxSize];
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void RemovePos(uptr i);
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#endif
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};
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// MutexSet is too large to live on stack.
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// DynamicMutexSet can be use used to create local MutexSet's.
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class DynamicMutexSet {
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public:
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DynamicMutexSet();
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~DynamicMutexSet();
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MutexSet* operator->() { return ptr_; }
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operator MutexSet*() { return ptr_; }
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DynamicMutexSet(const DynamicMutexSet&) = delete;
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DynamicMutexSet& operator=(const DynamicMutexSet&) = delete;
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private:
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MutexSet* ptr_;
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#if SANITIZER_GO
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MutexSet set_;
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#endif
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};
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// Go does not have mutexes, so do not spend memory and time.
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// (Go sync.Mutex is actually a semaphore -- can be unlocked
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// in different goroutine).
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#if SANITIZER_GO
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MutexSet::MutexSet() {}
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void MutexSet::Add(u64 id, bool write, u64 epoch) {}
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void MutexSet::Del(u64 id, bool write) {}
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void MutexSet::Remove(u64 id) {}
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void MutexSet::AddAddr(uptr addr, StackID stack_id, bool write) {}
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void MutexSet::DelAddr(uptr addr, bool destroy) {}
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uptr MutexSet::Size() const { return 0; }
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MutexSet::Desc MutexSet::Get(uptr i) const { return Desc(); }
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DynamicMutexSet::DynamicMutexSet() : ptr_(&set_) {}
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DynamicMutexSet::~DynamicMutexSet() {}
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#endif
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} // namespace __tsan
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#endif // TSAN_MUTEXSET_H
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