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Re: experimental: replace s_lock spinlock code with pthread_mutex on linux

Nils Goroll <slink@schokola.de>

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From: Nils Goroll <slink@schokola.de>
To: Martijn van Oosterhout <kleptog@svana.org>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, Merlin Moncure <mmoncure@gmail.com>, pgsql-hackers@postgresql.org
Date: 2012-06-27T10:10:47Z
Lists: pgsql-hackers 
>> Using futexes directly could be even cheaper.
> Note that below this you only have the futex(2) system call.
I was only referring to the fact that we could save one function and one library
call, which could make a difference for the uncontended case.

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  1. Reduce sinval synchronization overhead.