Experimental Physics and
Industrial Control System

Dirk Zimoch via Core-talk <core-talk at aps.anl.gov> · Tue, 24 Nov 2020 10:17:27 -0000

> Also, what is the motivation to economize pthread_mutexattr_t?  I see
> __SIZEOF_PTHREAD_MUTEXATTR_T==4 (on a 64-bit host).

It's simply not necessary that each mutex creates its own attribute.
>From the pthread_mutexattr_init manual page:
"After a mutex attributes object has been used to initialize one or more mutexes, any function affecting the attributes object (including destruction) shall not affect any previously initialized mutexes."
Thus the same attribute can be used for all mutexes and the mutex does not use it any more after creation. It is a waste of not only space but also time and error handling complexity to have (and keep!) one in each mutex.
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System