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Task Management
cannot detect the stack overflow “as soon” as the stack pointer exceeds the value of
.StkLimitPtr, it is important to position the value of .StkLimitPtr in the stack fairly far from
&MyTaskStk[0] , as shown in Figure 5-4. A software implementation such as this is not as
reliable as a hardware-based detection mechanism but still prevents a possible stack
overflow. Of course, the .StkLimitPtr field would be set using OSTaskCreate() as shown
above but this time, with a location further away from &MyTaskStk[0] .
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Figure 5-4 Software detection of stack overflows, monitoring .StkLimitPtr
4) Counting the amount of free stack space
Another way to check for stack overflows is to allocate more stack space than is anticipated
to be used for the stack, then, monitor and possibly display actual maximum stack usage at
run-time. This is fairly easy to do. First, the task stack needs to be cleared (i.e., filled with
zeros) when the task is created. Next, a low priority task walks the stack of each task
created, from the bottom ( &MyTaskStk[0] ) towards the top, counting the number of zero
entries. When the task finds a non-zero value, the process is stopped and the usage of the
stack can be computed (in number of bytes used or as a percentage). Then, adjust the size
of the stacks (by recompiling the code) to allocate a more reasonable value (either increase
or decrease the amount of stack space for each task). For this to be effective, however, run
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