Boost::shared_mutex 如何改进多线程应用程序中的并发访问管理？

boost::shared_mutex _access;

void reader() {
  // Acquire a shared lock to read the data
  boost::shared_lock<boost::shared_mutex> lock(_access);

  // Access the data without exclusive ownership
}

void conditional_writer() {
  // Acquire an upgrade lock to potentially upgrade to exclusive ownership
  boost::upgrade_lock<boost::shared_mutex> lock(_access);

  if (condition) {
    // Upgrade to an exclusive lock for writing
    boost::upgrade_to_unique_lock<boost::shared_mutex> uniqueLock(lock);

    // Perform the write operation with exclusive access
  } else {
    // Continue reading without exclusive ownership
  }
}

void unconditional_writer() {
  // Acquire an exclusive lock for writing
  boost::unique_lock<boost::shared_mutex> lock(_access);

  // Perform the write operation with exclusive access
}