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Should I use boost::upgrade_lock or just boost::unique_lock?

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Hi, is it much better to use boost::upgrade_lock and only change to boost::upgrade_to_unique_lock at a later stage, or should I just start off by using a boost::unique_lock??

for e.g

void FunctionA()
boost::shared_lock<boost::shared_mutex> read_lock(read_write_mutex_);

HashMap::iterator iter hash_map_.find("value");

if (hash_map_.end() == iter)
boost::upgrade_to_unique_lock<boost::shared_mutex> write_lock(read_lock);

iter->second.value = 1000;

is that better or should I just use a unique lock at the start and do a exclusive lock all the way till the function ends?


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