- Generated on Fri Jun 25 2021 12:16:22 for RKH by
1.9.2
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RKH
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SMA ready table. More...
#include <rkhfwk_rdygrp.h>
SMA ready table.
Each SMA is assigned a unique priority level between 0 and RKH_LOWEST_PRIO. Each SMA that is ready to run is placed in a ready list consisting of two variables, rkhrg.grp and rkhrg.tbl[]. SMA priorities are grouped (8 SMA per group) in rkhrg.grp. Each bit in rkhrg.grp is used to indicate whenever any SMA in a group is ready to run. When a task is ready to run it also sets its corresponding bit in the ready table, rkhrg.tbl[]. The size of rkhrg.tbl[] depends on RKH_LOWEST_PRIO (see rkhcfg.h).
SMA's priority = | 0 | 0 | Y | Y | Y | X | X | X |
Y's: bit position in rkhrg.grp and index into rkhrg.tbl[RKH_LOWEST_PRIO / 8 + 1]
X's: bit position in rkhrg.tbl[RKH_LOWEST_PRIO / 8 + 1]
The lower 3 bits (X's) of the SMA's priority are used to determine the bit position in rkhrg.tbl[], while the next three most significant bits (Y's) are used to determine the index into rkhrg.tbl[].
To determine which priority (and thus which SMA) will run next, the scheduler determines the lowest priority number that has its bit set in rkhrg.tbl[]. The relationship between rkhrg.grp and rkhrg.tbl[] is given by the following rules:
Bit 0 in rkhrg.grp is 1 when any bit in rkhrg.tbl[0] is 1.
Bit 1 in rkhrg.grp is 1 when any bit in rkhrg.tbl[1] is 1.
Bit 2 in rkhrg.grp is 1 when any bit in rkhrg.tbl[2] is 1.
Bit 3 in rkhrg.grp is 1 when any bit in rkhrg.tbl[3] is 1.
Bit 4 in rkhrg.grp is 1 when any bit in rkhrg.tbl[4] is 1.
Bit 5 in rkhrg.grp is 1 when any bit in rkhrg.tbl[5] is 1.
Bit 6 in rkhrg.grp is 1 when any bit in rkhrg.tbl[6] is 1.
Bit 7 in rkhrg.grp is 1 when any bit in rkhrg.tbl[7] is 1.
[JL]
Definition at line 125 of file rkhfwk_rdygrp.h.
1.9.2