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Task Management
.SemPendTime
This field contains the amount of time taken for the semaphore to be signaled. When
OSTaskSemPost() is called, the current time stamp is read and stored in the OS_TCB
(see .TS ). When OSTaskSemPend() returns, the current time stamp is read again and the
difference between the two times is stored in this variable. This field can be displayed by a
debugger or μC/Probe to indicate how much time it took for the task to be signaled.
This field is only available when setting OS_CFG_TASK_PROFILE_EN to 1 in OS_CFG.H .
.SemPendTimeMax
This field contains the maximum amount of time it took for the task to be signaled. It is a peak
detector of the value of .SemPendTime . The peak can be reset by calling OSStatReset() .
This field is only available if setting OS_CFG_TASK_PROFILE_EN to 1 in OS_CFG.H .
.SuspendCtr
This field is used by OSTaskSuspend() and OSTaskResume() to keep track of how many
times a task is suspended. Task suspension can be nested. When .SuspendCtr is 0, all
suspensions are removed. This field only exists in a TCB if task suspension is enabled at
compile time ( OS_CFG_TASK_SUSPEND_EN is set to 1 in OS_CFG.H ).
.StkSize
This field contains the size (in number of CPU_STK elements) of the stack associated with
the task. Recall that a task stack is declared as follows:
CPU_STK MyTaskStk[???];
.StkSize is the value of ??? in the above array.
.StkUsed and .StkFree
μC/OS-III is able to compute (at run time) the amount of stack space a task actually uses
and how much stack space remains. This is accomplished by a function called
OSTaskStkChk() . Stack usage computation assumes that the task’s stack is “cleared” when
the task is created. In other words, when calling OSTaskCreate() , it is expected that the
following options be specified: OS_TASK_OPT_STK_CLR and OS_TASK_OPT_STK_CHK .
OSTaskCreate() will then clear all the RAM used for the task’s stack.
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