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[fixes#2] Adding a simple TCB and a new variable 'next_task' #4

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[fixes#2] Adding a simple TCB and a new variable 'next_task' #4

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@fongwh1 fongwh1 commented Apr 24, 2015

Two changes:

  1. A simple task_control_block consists of a stack and a task pointer;
  2. A new variable 'next_task' indicates the following task to run.

@jserv jserv mentioned this pull request Apr 25, 2015
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fongwh1 added 3 commits April 25, 2015 11:26
@fongwh1
Add variable 'next_task'
1ad64c6 
An additional variable 'next_task' is helpful and clear for those who
wants to change something according to the next task.

If only 'current_task' is used, it must implicitly assume that the next
task is the current task before kernel selects the next one.

It is a fault when more than 2 tasks are created, for example:

　if Task [length of execution] => 1[1T], 2[2T], 3[3T]
　Task :　　　　　　　1 -> 2 -> 3 -> 1 -> 2 ->3
　Length of execution : 1T->2T->1T->2T->3T->1T (<--- which is wrong)
@fongwh1
Add a simple task_control_block
8f09fbd
@fongwh1
Change the way defining a struct
c1b82cd 
Use

typedef struct {
    ...
} tcb;

instead of

struct task_c_b {
    ...
} typedef tcb;
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