Re: [patch 08/19] mutex subsystem, core

[Kai Geek]

Hello,
can we run the semaphores from the console if we do it with mutex instead of interrupt context? in this case will the mutex codes be interrupted?
base a image run pid kernel/printk.c?
Best Regards,

----- Original Message -----
From: "Linus Torvalds" <torvalds@xxxxxxxx>
To: "Ingo Molnar" <mingo@xxxxxxx>
Subject: Re: [patch 08/19] mutex subsystem, core
Date: 	Tue, 3 Jan 2006 07:38:41 -0800 (PST)

> 
> 
> 
> On Tue, 3 Jan 2006, Ingo Molnar wrote:
> > > > Is this an interrupt deadlock, or do you not allow interrupt 
> > contexts > to even trylock a mutex?
> >
> > correct, no irq contexts are allowed. This is also checked for if 
> > CONFIG_DEBUG_MUTEXES is enabled.
> 
> Note that semaphores are definitely used from interrupt context, and as
> such you can't replace them with mutexes if you do this.
> 
> The prime example is the console semaphore. See kernel/printk.c, look for
> "down_trylock()", and realize that they are all about interrupts.
> 
> 			Linus
> -

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Kai "Ozgur" Geek
Network Engineer
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