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Detailed Flowcharts
Appendix D
D15
Figure D.16
TXALLOC
Subroutine
10086-I
TXAL-
LOC
UART
In
Use
?
Set IN–USE
Flag
RETURN
SLEEP
Wait at TXALWT
Until
UAR T is Free
Indivisible Zone
Common:
• IN–USE Flag
• TXAL WT : A Sleep V ariable
N
o
Yes
11667
Figure D.17
TXFREE
Subroutine
10087-I
TXFREE
Reset IN–USE
Flag
WAKEUP
Continue
Any
Process at
TXALWT
RETURN
Common:
• IN–USE Flag
• TXALWT : A Sleep V ariable