mutex vs recursive_mutex
Hello coders! 👨💻👨💻
😎😎 As a C++ developer, you're probably familiar with mutexes as a means of achieving thread safety in
concurrent
programs. However, not all mutexes are created equal. In particular, the standard library provides two
distinct types of
mutexes:
std::mutex
AND
std::recursive_mutex.
In this post, we'll explore the differences between the two and when you might choose one over the
other.
🤔🤔 WHAT is std:mutex ?
• std::mutex is a non-recursive mutex, which means that it cannot be locked more than once by the same
thread. If a
thread attempts to lock a mutex that it already owns, it will deadlock.
📍📍 WHEN is std:mutex useful?
This can be useful in some cases where you want to ensure that a particular section of code can only be
executed by one
thread at a time. However, it can be limiting in cases where you need more fine-grained control over
locking.
🤔🤔 WHAT is std::recursive_mutex ?
• std::recursive_mutex, on the other hand, is a recursive mutex that allows a thread to lock the mutex
multiple times
without deadlocking.
📍📍 WHEN is std::recursive_mutex useful?
This can be useful in cases where you have nested critical sections that may be executed by the same
thread. For
example, if you have a class that uses a mutex to protect its internal state, and that class has member
functions that
also use the same mutex, a recursive mutex would allow those member functions to be called without
deadlocking.
💡💡 Plus, It's worth noting that recursive mutexes come with some performance overhead compared to
non-recursive
mutexes. If you don't need the extra functionality provided by a recursive mutex, it's generally better
to use a
non-recursive mutex.
🔥🔥 In conclusion, both std::mutex and std::recursive_mutex have their use cases in concurrent
programming. If you need
a simple, non-recursive mutex for basic thread safety, std::mutex is the way to go. However, if you need
more advanced
locking functionality, such as support for nested critical sections, std::recursive_mutex may be a
better fit. As
always, be mindful of performance considerations when choosing between the two.
I hope you found this post interesting and useful. Additionally, I would be grateful if you could share
your knowledge
about this topic. ✍️✍️
Thanks for reading and happy coding!! 👨💻👨💻
#embedded #concurrent #programming #c #mutex #recursive_mutex