<div dir="ltr"><div><div>Hi MJ,<br><br></div><div>The switch_to(prev, next) function stores the registers of task "prev" to its kernel stack, than restores registers<br>of task "next" from its kernel stack than resumes task "next" in kernel mode.<br>
</div><div>If the selected task is a user process, it just takes the "return to user" path to user space.<br></div><div><br></div>Regards, <br></div>MH<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Fri, Jan 3, 2014 at 6:31 PM, Mj Embd <span dir="ltr"><<a href="mailto:mj.embd@gmail.com" target="_blank">mj.embd@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi,<br>
<br>
A very basic question.<br>
AFAIK schedule() selects the next process to run.<br>
Now once it has selected the process, and say if the process is a user<br>
space or kernel space one. how does the switch to user happens,<br>
<br>
a) Is it in schedule function . it has to be a arch level function<br>
called from schedule()<br>
<br>
b) or Else where, so is there a umberlla function like<br>
<br>
somefunc()<br>
{<br>
task_ptr = schedule();<br>
switch_to(task_ptr)<br>
<br>
...<br>
<br>
}<br>
<br>
Can someone explain this<br>
<br>
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</blockquote></div><br></div>