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On Sat, Jan 12, 2002 at 06:48:28PM +0100, Roman Zippel wrote: > Hi, > > yodaiken@fsmlabs.com wrote: > > > No. The point of using semaphores is that one can sleep while > > _waiting_ for the resource. > > [...] > > In a preemptive kernel this can cause a deadlock. In a non > > preemptive it cannot. You are correct in that > > B: > > get sem on memory pool > > do potentially blocking operations > > release sem > > is also dangerous - but I don't think that helps your case. > > To fix B, we can enforce a coding rule - one of the reasons why > > we have all those atomic ops in the kernel is to be able to > > avoid this problem. > > Sorry I can't follow you. First, one can sleep while waiting for the We're having a write only discussion - time to stop. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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