Crate taskctx

Task context for scheduling

The crate defines the needful fields for task context switching and scheduling.

Content

• tls: Thread Local Storage (TLS) area for each task.

• stat: Task statistics.

• preempt_disable_count: Preemption disable counter. Only when the counter is zero, the task can be preempted. It can be used to implement preemption protection lock.

Structs

• ExtendedState
  Extended state of a task, such as FP/SIMD states.
• FxsaveArea
  A 512-byte memory region for the FXSAVE/FXRSTOR instruction to save and restore the x87 FPU, MMX, XMM, and MXCSR registers.
• SchedStatus
  The status of the scheduler
• TaskContext
  Saved hardware states of a task.
• TaskId
  A unique identifier for a thread.
• TaskInner
  The inner task structure used as the minimal unit of scheduling.
• TimeStat
  任务时间统计结构

Enums

• SchedPolicy
  The policy of the scheduler
• TaskState
  The possible states of a task.
• TimerType
  sys_settimer / sys_gettimer 中设定的 which，即计时器类型

Functions

• context_switch^⚠
  Switches the context from the current task to the next task.
• current_task_ptr
  Gets the pointer to the current task with preemption-safety.
• disable_preempt
  Disables kernel preemption.
• enable_preempt
  Enables kernel preemption.
• set_current_task_ptr^⚠
  Sets the pointer to the current task with preemption-safety.