F$Sleep modified by Lothan

Lothan — Fri, 27 Jun 2014 23:20:12 -0000

Sleep
Temporarily turns off the calling process

OS9 F$Sleep 103F 0A

Entry Conditions

X One of the following:

sleep time (in ticks)

0 = sleep indefinitely

1 = sleep for the remainder of the current time slice

Exit Conditions

X sleep time minus the number of ticks that the process was asleep

Error Output

CC carry set on error

B error code (if any)

Additional Information

If Register X contains zero, NitrOS-9 turns the process off until it receives a signal. Putting a process to sleep is a good way to wait for a signal or interrupt without wasting CPU time.
If Register X contains one, NitrOS-9 turns the process off for the remainder of the process’s current time slice. It inserts the process into the active process queue immediately. The process resumes execution when it reaches the front of the queue.
If Register X contains an integer in the rage 2-255, NitrOS-9 turns off the process for the specified number of ticks, n. It inserts the process into the active process queue after n-1 ticks. The process resumes execution when it reaches the front of the queue. If the process receives a signal, it awakens before the time has elapsed.
When you select processes among multiple windows, you might need to sleep for two ticks.

krnp2

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