int pthread_condattr_init(pthread_condattr_t *attr);
int pthread_condattr_destroy(pthread_condattr_t *attr);
Condition attributes can be specified at condition creation time, by passing a condition attribute object as second argument to pthread_cond_init(3). Passing NULL is equivalent to passing a condition attribute object with all attributes set to their default values.
The LinuxThreads implementation supports no attributes for conditions. The functions on condition attributes are included only for compliance with the POSIX standard.
pthread_condattr_init initializes the condition attribute object attr and fills it with default values for the attributes. pthread_condattr_destroy destroys a condition attribute object, which must not be reused until it is reinitialized. Both functions do nothing in the LinuxThreads implementation.