Kris Kennaway wrote:
PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP is just in <pthread.h>.
/*
* Static initialization values.
*/
#define PTHREAD_MUTEX_INITIALIZER NULL
#define PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP NULL
#define PTHREAD_COND_INITIALIZER NULL
#define PTHREAD_RWLOCK_INITIALIZER NULL
I remembered mysql uses this macro to initialize spin mutex, and you
indead needs a patch to let it work
No, with the code I committed mysql detects and uses it out of the
box, without requiring any patches. It is easy to measure the
resulting 30% performance improvement at high loads ;-)
see above, I didn't see any code set PTHREAD_MUTEX_ADAPTIVE_NP type.
The code is already in mysql for use with glibc. It basically does
#ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
/*
* Use PTHREAD_MUTEX_ADAPTIVE_NP for the mutexes we know will benefit
* from it
*/
...
#endif
so it just works.
I can not find code in libthr setting mutex's member field m_type to
PTHREAD_MUTEX_ADAPTIVE_NP by your change, so how can it work as
expected ?
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