spin_lock for the embedded systems !

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brian Contact options for registered users 's Avatar (by Gravatar) posted on
February 28, 2005, 2:19 pm
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Hi,

spin_locks are busy-looping locks, they needssanother processor to
help them to escape the busy loop. So, I think spin_locks are useless
for a single processor embedded system. Is it right ?

regards,
Saturn

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Andrew Reilly Contact options for registered users 's Avatar (by Gravatar) posted on
February 28, 2005, 9:34 pm
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Re: spin_lock for the embedded systems !
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No.  Some embedded systems have interrupts too...

--
Andrew


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brian Contact options for registered users 's Avatar (by Gravatar) posted on
March 2, 2005, 1:44 am
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Re: spin_lock for the embedded systems !
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But spin_lock() in the include/linux/spin_lock.h is nothing to do if CONFIG_SMP
does not define. So, if spin_lock_bh() is invoked, it just disable BH but not
lock the critical session. Right ?

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