h6. [[OS SWI Calls]] h6(. » [[OS_UpCall]] h6((. » OS_UpCall 9 h2. OS_UpCall 9 h5. (SWI &33) |_<^{width:4em}. Entry | | |<^. R0 |<^. 9| |<^. R1 |<^. Buffer handle| |<^. R2 |<^. -1| |_<^{width:4em}. Exit | | |<^. R0 |<^. Preserved | |<^. R1 |<^. Preserved | |<^. R2 |<^. Preserved | h4. Use The purpose of this call is to inform your application that a buffer's free space has become greater than or equal to its specified threshold. h4. Notes The Buffer Manager issues this call when data is removed from the specified buffer, and the free space becomes greater than or equal to its current threshold. This call is never issued under RISC OS 2. h4. See also * [[OS_UpCall]]