The function int pthread_condattr_init(pthread_condattr_t *attr); shall initialize a condition variable attributes object attr with the default value for all of the attributes defined by the implementation. After a condition variable attributes object has been used to initialize one or more condition variables, any function affecting the attributes object (including destruction) shall not affect any previously initialized condition variables. If successful, it shall return zero; The pthread_condattr_init() function shall fail if: [ENOMEM] Insufficient memory exists to initialize the condition variable attributes object.