HP-UX Reference (11i v2 03/08) - 3 Library Functions N-Z (vol 7)

pthread_mutexattr_getspin_np(3T) pthread_mutexattr_getspin_np(3T)

(Pthread Library)

[EINVAL]

pthread_mutex_disable_handoff_np()

was called after the process became

multithreaded.

WARNINGS

The settings of the spin and yield attributes can, as well as improve application performance, easily lead

to degraded performance. The CPU consumption of the application may be increased. Settings which

work well for a small number of threads may do poorly for larger numbers of threads. The optimal set-

tings will vary depending upon hardware and operating system conﬁguration. Minor changes in the

application itself may require retuning of these attributes.

The programmer must analyze performance carefully to obtain an understanding of mutex contention

within the application. Then, experiment with different attribute values, evaluating how mutex conten-

tion is affected, response time, and CPU consumption.

AUTHOR

pthread_mutexattr_getspin_np()

, pthread_mutexattr_setspin_np()

pthread_mutex_getyieldfreq_np()

, pthread_mutex_setyieldfreq_np()

pthread_mutexattr_disable_handoff_np()

, and

pthread_mutex_disable_handoff_np()

were developed by HP.