Echelon FTXL - Manual (Page 174)

162 FTXL LonTalk API
Figure 13. FTXL Abstract Priorities
Before you can instantiate a task within an application, you must map the FTXL
OSAL abstract priorities to the operating system’s priorities. The abstract
priorities are defined in the FtxlOsal.h file that is copied to your project directory
by the LonTalk Interface Developer utility.
To map the FTXL OSAL abstract priorities to the operating system’s priorities,
use the macros that are defined in the FtxlOsal.h file, as listed in Table 32. The
FTXL OSAL reserves room between the high and medium FTXL tasks for high
priority application tasks, and between the medium and low FTXL tasks for
medium priority tasks. The relationships between these macros are shown in
Figure 14 on page 163.
Table 32. Macros for Operating System Task Priorities
Macro Description
OS_HIGH_PRIORITY_BASE Defines the OS priority number of the
highest priority task used by the FTXL
OSAL.
OS_APPLICATION_HIGH_PRIORITY_BASE Defines the highest OS priority used for
high priority application tasks.
These tasks should have a higher priority
than the FTXL OSAL medium priority
tasks, but lower than the OSAL high
priority tasks.
OS_MEDIUM_PRIORITY_BASE Defines the highest OS priority used for
medium priority FTXL tasks.
These tasks should have a higher priority
than normal application tasks, but lower
than the application high priority tasks.
OS_APPLICATION_PRIORITY_BASE Defines the highest OS priority used for
normal application tasks.
These tasks should have a higher priority
than FTXL OSAL low priority tasks, but
lower than the FTXL OSAL medium priority
tasks.
OS_LOW_PRIORITY_BASE Defines the highest OS priority used for low
priority tasks.