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<DIV>So how can I let a task spinning on the processor when it is waiting for a
resource rather than being preempted by a lower priority task?</DIV>
<DIV>1. Enqueue that blocked task in the ready queue and pick up the highest
priority task as the next scheduled task</DIV>
<DIV>2. Let an 'empty' thread occupy the processor in the blocked task's
priority to protect the process occupied by lower priority task</DIV>
<DIV>Which solution should I take? Could you give me some suggestion?</DIV>
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<DIV style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana; COLOR: #c0c0c0"
align=left>2016-10-03
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<SPAN id=_FlashSignName>shijunjie92</SPAN> </DIV>
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<DIV><STRONG>发件人：</STRONG>Björn Brandenburg <bbb@mpi-sws.org></DIV>
<DIV><STRONG>发送时间：</STRONG>2016-10-03 13:00</DIV>
<DIV><STRONG>主题：</STRONG>Re: [LITMUS^RT] How to handle the blocked task</DIV>
<DIV><STRONG>收件人：</STRONG>"litmus-dev"<litmus-dev@lists.litmus-rt.org></DIV>
<DIV><STRONG>抄送：</STRONG></DIV>
<DIV> </DIV>
<DIV>
<DIV> </DIV>
<DIV>> On 02 Oct 2016, at 18:44, shijunjie92 <shijunjie92@gmail.com> wrote: </DIV>
<DIV>> </DIV>
<DIV>> I have noticed that, in the pfp_schedule(), only if the prev task is !block, it can be requeued. </DIV>
<DIV>> So what happen if the prev_task is blocked? which queue it blongs to? </DIV>
<DIV>> </DIV>
<DIV> </DIV>
<DIV>None. It suspends, so the scheduler doesn’t keep track of it any longer. A blocked task is most likely on some wait queue, but not necessarily so (see SIGSTOP). But that is not the scheduler’s concern. </DIV>
<DIV> </DIV>
<DIV>- Björn </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>_______________________________________________ </DIV>
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