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Question

I used boost::shared_mutex as synchronization objects in Writer-Readers model. However, it's considerably slow compared with no locks used (In my test: without any readers, to write 500,000 values it takes 100 msec if no locks used and ~500 msec if boost::shared_mutex used). That's why I decided to consider something like spinlock. I would like to make a portable spinlock (Windows + Linux).

1. Is there any boost wrapper that I can use instantly?
2. This is a good topic that shows how to implement spinlock on Windows. But I was unable to find out equivalents of Win32 APIs such as InterlockedCompareExchange , YieldProcessor , InterlockedDecrement on Linux.

Update 2016/03/08

I found out a guide and the implementation released by facebook on github. Haven't tried it yet. I updated here for anyone who will have the same question and might want to refer.

Answer 1

1. There exists no portable solution for C++03 because C++03 has no memory model but you can implement it very easily by just copying atomic_flag implementations of your target platform.

2. My comment for the given link/tutorial: volatile should not be used by an application programmer unless you access unusual memory. I recommend this and all others articles of that topic. There should be a ready to use library for download. I do not know if it is C++11 only.

3. I assume you are not very experienced with multithreading, synchronization and locks. Whatever you want to achieve, just go the standard route first and came back later if your performance is not enough.