ompd_size_t
typedef ompd_rc_t (*ompd_callback_memory_alloc_fn_t)(ompd_size_t nbytes,
ompd_size_t sizeof_thread_id, const void *thread_id,
ompd_size_t nbytes, void *buffer);
ompd_size_t nbytes, const void *buffer);
ompd_size_t unit_size, ompd_size_t count, void *output);
ompd_device_t kind, ompd_size_t sizeof_id,
ompd_size_t sizeof_thread_id,
ompd_size_t sizeof_thread_id, void *thread_id);