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Simplelock v.s lock
Hey guys. I am a noob in netbsd. I had some experience with linux before though.
During my work, ive approached a problem when i need to use a
Linux-like spin locks.
I found out that i need to use either lock or simplelock in NetBSD.
My question is : what is the exact difference between those two ?
According to the manual:
Provides a simple spinning mutex. A processor will busy-wait
while trying to acquire a simplelock. The simplelock operations
are implemented with machine-dependent locking primitives.
Simplelocks are usually used only by the high-level lock manager
and to protect short, critical sections of code. Simplelocks
are the only locks that can be used inside an interrupt handler.
For a simplelock to be used in an interrupt handler, care must
be taken to disable the interrupt, acquire the lock, do any pro-
cessing, release the simplelock and re-enable the interrupt.
This procedure is necessary to avoid deadlock between the inter-
rupt handler and other threads executing on the same processor.
Provides a high-level lock supporting sleeping/spinning until
the lock can be acquired. The lock manager supplies both exclu-
sive-access and shared-access locks, with recursive exclusive-
access locks within a single thread. It also allows upgrading a
shared-access lock to an exclusive-access lock, as well as down-
grading an exclusive-access lock to a shared-access lock.'
Is the only difference that simplelocks are 'turining interrupts off'
, and the other is not ??
Thanks in advance for any reply.
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