ThreadSafeDenseMap.h

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//===-- ThreadSafeDenseMap.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 LLDB_CORE_THREADSAFEDENSEMAP_H
#define LLDB_CORE_THREADSAFEDENSEMAP_H
 
#include <mutex>
 
#include "llvm/ADT/DenseMap.h"
 
 
namespace lldb_private {
 
template <typename _KeyType, typename _ValueType,
          typename _MutexType = std::mutex>
class ThreadSafeDenseMap {
public:
  typedef llvm::DenseMap<_KeyType, _ValueType> LLVMMapType;
 
  ThreadSafeDenseMap(unsigned map_initial_capacity = 0)
      : m_map(map_initial_capacity), m_mutex() {}
 
  void Insert(_KeyType k, _ValueType v) {
    std::lock_guard<_MutexType> guard(m_mutex);
    m_map.insert(std::make_pair(k, v));
  }
 
  void Erase(_KeyType k) {
    std::lock_guard<_MutexType> guard(m_mutex);
    m_map.erase(k);
  }
 
  _ValueType Lookup(_KeyType k) {
    std::lock_guard<_MutexType> guard(m_mutex);
    return m_map.lookup(k);
  }
 
  bool Lookup(_KeyType k, _ValueType &v) {
    std::lock_guard<_MutexType> guard(m_mutex);
    auto iter = m_map.find(k), end = m_map.end();
    if (iter == end)
      return false;
    v = iter->second;
    return true;
  }
 
  void Clear() {
    std::lock_guard<_MutexType> guard(m_mutex);
    m_map.clear();
  }
 
protected:
  LLVMMapType m_map;
  _MutexType m_mutex;
};
 
} // namespace lldb_private
 
#endif // LLDB_CORE_THREADSAFEDENSEMAP_H