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Task Management
.PendDataEntries
This field works with the .PendDataTblPtr , indicating the number of objects a task is
pending on at the same time.
.TS
This field is used to store a “time stamp” of when an event that the task was waiting on
occurred. When the task resumes execution, this time stamp is returned to the caller.
.MsgPtr
When a message is sent to a task, this field contains the message received. This field only
exists in a TCB if message queue services ( OS_CFG_Q_EN is set to 1 in OS_CFG.H ), or task
message queue services, are enabled ( OS_CFG_TASK_Q_EN is set to 1 in OS_CFG.H ) at
compile time.
.MsgSize
When a message is sent to a task, this field contains the size (in number of bytes) of the
message received. This field only exists in a TCB if message queue services ( OS_CFG_Q_EN
is set to 1 in OS_CFG.H ), or task message queue services, ( OS_CFG_TASK_Q_EN is set to 1 in
OS_CFG.H ) are enabled at compile time.
.MsgQ
μC/OS-III allows tasks or ISRs to send messages directly to tasks. Because of this, a message
queue is actually built into each TCB. This field only exists in a TCB if task message queue
services are enabled at compile time ( OS_CFG_TASK_Q_EN is set to 1 in OS_CFG.H ). .MsgQ is
used by the OSTaskQ???() services.
.MsgQPendTime
This field contains the amount of time for a message to arrive. When OSTaskQPost() is
called, the current time stamp is read and stored in the message. When OSTaskQPend()
returns, the current time stamp is read again and the difference between the two times is
stored in this variable. A debugger or μC/Probe can be used to indicate the time taken for a
message to arrive by displaying this field.
This field is only available if setting OS_CFG_TASK_PROFILE_EN to 1 in OS_CFG.H .
101
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