fi_cq(3) on Linux
The text 89cd51e67783, as Debian 9 (Stretch) shipped it.
Completion queue operations fi_cq_open / fi_close : Open/close a completion queue fi_control : Control CQ operation or attributes. fi_cq_read / fi_cq_readfrom / fi_cq_readerr : Read a completion from a completion queue fi_cq_sread / fi_cq_sreadfrom : A synchronous (blocking) read that waits until a specified condition has been met before reading a completion from a completion queue. fi_cq_signal : Unblock any thread waiting in fi_cq_sread or fi_cq_sreadfrom. fi_cq_strerror : Converts provider specific error information into a printable string