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.Dd August 6, 2010 .Dt PTHREAD_ATTR_GET_NP 3 .Os .Sh NAME .Nm pthread_attr_get_np , .Nm pthread_getattr_np .Nd get attributes of existing thread .Sh LIBRARY .Lb libpthread .Sh SYNOPSIS n pthread.h .Ft int .Fn pthread_attr_get_np "pthread_t thread" "pthread_attr_t *attr" .Ft int .Fn pthread_getattr_np "pthread_t thread" "pthread_attr_t *attr" .Sh DESCRIPTION The .Fn pthread_attr_get_np and .Fn pthread_getattr_np functions can be used to retrieve attributes of a running .Fa thread . The result is stored to .Fa attr .
p For .Fn pthread_attr_get_np .Fa attr should be initialized prior to the call by using .Xr pthread_attr_init 3 . .Fn pthread_getattr_np does this automatically.
p For both functions .Fa attr should be freed when it is not in use anymore with .Xr pthread_attr_destroy 3 .
p Most fields of .Fa attr are the same ones provided during thread creation time as a parameter to .Xr pthread_create 3 . The exceptions include: l -bullet -offset indent t The detach state -- a joinable thread may have detached itself after the creation. t The guard size, which may vary if the application has allocated its own thread stack. t The stack address and size; .Fn pthread_attr_get_np will always return the thread's real stack address and size, regardless of the values in the original attributes structure. .El
p The returned .Vt pthread_attr_t structure is supposed to be used in conjunction with the .Fn pthread_attr_get* functions to retrieve individual values from the structure. When the returned .Fa attr is no longer needed, it should be destroyed by using .Xr pthread_attr_destroy 3 . .Sh RETURN VALUES Upon successful completion, .Fn pthread_attr_get_np and .Fn pthread_getattr_np return 0. Otherwise an error number is returned to indicate the error. .Sh COMPATIBILITY The .Fn pthread_attr_get_np and .Fn pthread_getattr_np functions are non-standard extensions. .Sh ERRORS The .Fn pthread_attr_get_np and .Fn pthread_getattr_np functions will fail if: l -tag -width Er t Bq Er ENOMEM Insufficient memory. t Bq Er ESRCH Non-existent .Fa thread . .El .Sh SEE ALSO .Xr pthread 3 , .Xr pthread_attr 3
Indexes created Sat Sep 20 22:09:52 GMT 2025