* [ECOS] exit() and lock()
@ 2004-04-23 13:17 wyb
2004-04-23 14:13 ` Nick Garnett
0 siblings, 1 reply; 2+ messages in thread
From: wyb @ 2004-04-23 13:17 UTC (permalink / raw)
To: ecos-discuss
I'm reading the ECOS source code, and confused by Cyg_Thread::exit() calling lock() on entry, but not calling unlock() before return (Althrough it never return)
Can anybody help me? thanks
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [ECOS] exit() and lock()
2004-04-23 13:17 [ECOS] exit() and lock() wyb
@ 2004-04-23 14:13 ` Nick Garnett
0 siblings, 0 replies; 2+ messages in thread
From: Nick Garnett @ 2004-04-23 14:13 UTC (permalink / raw)
To: wyb; +Cc: ecos-discuss
"wyb" <wyb@topsec.com.cn> writes:
> I'm reading the ECOS source code, and confused by Cyg_Thread::exit()
> calling lock() on entry, but not calling unlock() before return
> (Althrough it never return)
>
> Can anybody help me? thanks
The last thing it does is call Cyg_Scheduler::reschedule(). This
causes the current thread to lose control of the CPU without
decrementing the scheduler lock.
The scheduler lock is effectively a per-thread value, so when the
context switches to another thread, the lock will be set to that
thread's lock value. It simply doesn't matter that the exited thread
has a non-zero lock value, it will never be rescheduled.
--
Nick Garnett eCos Kernel Architect
http://www.ecoscentric.com The eCos and RedBoot experts
--
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
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2004-04-23 13:17 [ECOS] exit() and lock() wyb
2004-04-23 14:13 ` Nick Garnett
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