NonStop S-Series Server Description Manual (G06.27+)

Input/Output Operations
HP NonStop S-Series Server Description Manual—520331-004
10-25
Actions for Empty or Full Queues
Figure 10-12. Empty Queue Requires Wakeup Prod, Full Queue Requires Full
Notice
Queue Condition Next Action
When Write pointer advances,
send Wakeup Prod to reader.
Queue Empty
Queue Full
Low-Water Mark
Send Full Notice to prevent further
writes.
Reading continues until Low-Water
Mark is reached.
Low-Water Mark
Writes may resume.
Write
Read
Write
Read
Write
Read
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