Andi Kleen e8c659d74e Add elision to pthread_mutex_{try,timed,un}lock ... Add elision paths to the basic mutex locks. The normal path has a check for RTM and upgrades the lock to RTM when available. Trylocks cannot automatically upgrade, so they check for elision every time. We use a 4 byte value in the mutex to store the lock elision adaptation state. This is separate from the adaptive spin state and uses a separate field. Condition variables currently do not support elision. Recursive mutexes and condition variables may be supported at some point, but are not in the current implementation. Also "trylock" will not automatically enable elision unless some other lock call has been already called on the lock. This version does not use IFUNC, so it means every lock has one additional check for elision. Benchmarking showed the overhead to be negligible.		2013-07-02 08:46:55 -07:00
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i386	Reserve new TLS field for x86 and x86_64	2013-05-15 20:20:54 +02:00
powerpc	PowerPC: Reserve TCB space for EBB framework	2013-06-17 15:50:53 -05:00
pthread	Add new internal mutex type flags for elision.	2013-07-02 08:46:54 -07:00
s390	Update copyright notices with scripts/update-copyrights.	2013-01-02 19:05:09 +00:00
sh	Update copyright notices with scripts/update-copyrights.	2013-01-02 19:05:09 +00:00
sparc	Update copyright notices with scripts/update-copyrights.	2013-01-02 19:05:09 +00:00
unix/sysv/linux	Add elision to pthread_mutex_{try,timed,un}lock	2013-07-02 08:46:55 -07:00
x86_64	Reserve new TLS field for x86 and x86_64	2013-05-15 20:20:54 +02:00