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Ramine
May 11, 2016, 9:30:17 AM5/11/16
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Hello......
Look at this scalable Asymmetric rw_mutex from Dmitry Vyukov:
https://groups.google.com/forum/#!topic/lock-free/Hv3GUlccYTc
If you have noticed he is using a compiler "_ReadWriteBarrier()",
but this doesn't emmit a fence on x86, it is just a compiler barrier,
but i am wondering how can he do it this way because loads
of the reader critical section can be reordered on x86 with the
following store:
reader_inside[current_thread_index] = true;
So i think it is a bug, can you please shade some light on this ?
Thank you,
Amine Moulay Ramdane.
Look at this scalable Asymmetric rw_mutex from Dmitry Vyukov:
https://groups.google.com/forum/#!topic/lock-free/Hv3GUlccYTc
If you have noticed he is using a compiler "_ReadWriteBarrier()",
but this doesn't emmit a fence on x86, it is just a compiler barrier,
but i am wondering how can he do it this way because loads
of the reader critical section can be reordered on x86 with the
following store:
reader_inside[current_thread_index] = true;
So i think it is a bug, can you please shade some light on this ?
Thank you,
Amine Moulay Ramdane.
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