Thread attributes are used to specify parameters to
pthread_create(). One attribute object can be used in multiple calls to
pthread_create(), with or without modifications between the calls. The
pthread_attr_t type is an opaque representation of the thread attributes; any access to the object other than via the described
pthread_attr_*() functions may result in undefined behavior.
The
pthread_attr_init() function initializes
attr with the default thread attributes used in the implementation. Depending on the implementation, undefined behavior may follow if an uninitialized thread attribute object is used with some of the thread attribute functions. It is therefore a good practice to always use
pthread_attr_init(), even if this might be unnecessary. Undefined behavior may also follow if an already initialized
attr is used with
pthread_attr_init().
When the attribute object is no longer needed, it should be destroyed by using
pthread_attr_destroy(). The function has no effect on threads that were created by using a given attribute object. A destroyed
attr can be reinitialized using
pthread_attr_init(), but all other actions with the destroyed object are unspecified.
The following standard thread attribute functions are available:
inherit scheduler attribute
thread scheduling parameter
Each listed
pthread_attr_get*() function contains a
pthread_attr_set*() counterpart. In addition, the following
NetBSD specific extensions are available:
attributes of a running thread
descriptive name of an attribute