[OS] VxWorks Task Scheduling

VxWorks

 

Ready/Exec

the task that is ready to run and not waiting for any resource other than CPU.

Pended

the task that is blocked and waiting for availability of resources. For example, semTake() will block the task if the semaphore is not available, and semGive() will take it back to Ready state.

Delayed

the task that is waiting for an amount of time to pass. For example, taskDelay() will take the task to this state. After the timeout is expired, it becomes Ready state.

Pended & Delayed

the task that is blocked and waiting for availability of resources with a timeout.

Suspended

the task that is unavailable to execution. It’s primarily used for debugging. It will not affect task state, but only task execution. For example, taskSuspend() of a task in Ready will lead to this state, and taskResume() will resume this task to Ready.

Delayed & Suspended

the task that is both delayed and suspended. If the task is resumed, its state will be delayed. For example, taskSuspend() of a task in Delayed will lead to this state, and taskResume() will resume this task to Delayed.

Pended & Suspended

the task that is both pended and suspended. If the task is resumed, its state will be pended. For example, taskSuspend() of a task in Pended will lead to this state, and taskResume() will resume this task to Pended.

Pended & Delayed & Suspended

the task that is pended, delayed and suspended. If the task is resumed, its state will be pended & delayed. For example, taskSuspend() of a task in Pended and Delayed will lead to this state, and taskResume() will resume this task to Pended and Delayed.