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//===-- ThreadSafeSTLMap.h --------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef liblldb_ThreadSafeSTLMap_h_
#define liblldb_ThreadSafeSTLMap_h_
#include <map>
#include <mutex>
#include "lldb/lldb-defines.h"
namespace lldb_private {
template <typename _Key, typename _Tp> class ThreadSafeSTLMap {
public:
typedef std::map<_Key, _Tp> collection;
typedef typename collection::iterator iterator;
typedef typename collection::const_iterator const_iterator;
//------------------------------------------------------------------
// Constructors and Destructors
//------------------------------------------------------------------
ThreadSafeSTLMap() : m_collection(), m_mutex() {}
~ThreadSafeSTLMap() {}
bool IsEmpty() const {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
return m_collection.empty();
}
void Clear() {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
return m_collection.clear();
}
size_t Erase(const _Key &key) {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
return EraseNoLock(key);
}
size_t EraseNoLock(const _Key &key) { return m_collection.erase(key); }
bool GetValueForKey(const _Key &key, _Tp &value) const {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
return GetValueForKeyNoLock(key, value);
}
// Call this if you have already manually locked the mutex using the
// GetMutex() accessor
bool GetValueForKeyNoLock(const _Key &key, _Tp &value) const {
const_iterator pos = m_collection.find(key);
if (pos != m_collection.end()) {
value = pos->second;
return true;
}
return false;
}
bool GetFirstKeyForValue(const _Tp &value, _Key &key) const {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
return GetFirstKeyForValueNoLock(value, key);
}
bool GetFirstKeyForValueNoLock(const _Tp &value, _Key &key) const {
const_iterator pos, end = m_collection.end();
for (pos = m_collection.begin(); pos != end; ++pos) {
if (pos->second == value) {
key = pos->first;
return true;
}
}
return false;
}
bool LowerBound(const _Key &key, _Key &match_key, _Tp &match_value,
bool decrement_if_not_equal) const {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
return LowerBoundNoLock(key, match_key, match_value,
decrement_if_not_equal);
}
bool LowerBoundNoLock(const _Key &key, _Key &match_key, _Tp &match_value,
bool decrement_if_not_equal) const {
const_iterator pos = m_collection.lower_bound(key);
if (pos != m_collection.end()) {
match_key = pos->first;
if (decrement_if_not_equal && key != match_key &&
pos != m_collection.begin()) {
--pos;
match_key = pos->first;
}
match_value = pos->second;
return true;
}
return false;
}
iterator lower_bound_unsafe(const _Key &key) {
return m_collection.lower_bound(key);
}
void SetValueForKey(const _Key &key, const _Tp &value) {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
SetValueForKeyNoLock(key, value);
}
// Call this if you have already manually locked the mutex using the
// GetMutex() accessor
void SetValueForKeyNoLock(const _Key &key, const _Tp &value) {
m_collection[key] = value;
}
std::recursive_mutex &GetMutex() { return m_mutex; }
private:
collection m_collection;
mutable std::recursive_mutex m_mutex;
//------------------------------------------------------------------
// For ThreadSafeSTLMap only
//------------------------------------------------------------------
DISALLOW_COPY_AND_ASSIGN(ThreadSafeSTLMap);
};
} // namespace lldb_private
#endif // liblldb_ThreadSafeSTLMap_h_
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