Attr

Attr is a protected inner class that holds the thread attribute from the pthread library in the variable a_. For information on pthread_attr_t, check pthread_attr_t. The constructor initializes a_ and the destructor calls pthread_attr_destroy. For information on pthread_attr_init, check pthread_attr_init. getp() just returns a pointer to a_.

The constructor for the inner class Attr is not called by the CRunnable constructor.

SigMask

SigMask is a protected inner class that just holds the variable and methods to deal with signal sets. For more information on signal sets, check Signal Sets.