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    SubjectRe: [FIX] Make deadlock detection work for file locking
    On Thu, Aug 24, 2000 at 11:38:02PM +0200, wrote:

    > BTW, this is a little off-topic, I kind of wonder what the right semantics
    > for deadlock detection are with threads. POSIX 1003.1 1996-07-12 says:
    > ... If the system detects that sleeping until a
    > locked region is unlocked would cause a deadlock, the fcntl()
    > function shall fail with an [EDEADLK] error."
    > Okay, that's a little vague already. Now let's make it more interesting
    > by adding threads:
    > Process Thread Action (executed in this order)
    > A 1 grab lock X
    > B 1 grab lock Y
    > A 2 try to get lock Y
    > B 2 try to get lock X
    > Solaris 2.5.1 thinks this is a deadlock. Linux 2.4.0-test1-ac16 thinks
    > it isn't. I haven't found any definition of what "putting a process to
    > sleep" means in POSIX.1.

    I don't have POSIX in front of me, but I do not think
    the system must detect deadlock. It is allowed to detect
    deadlock, and in case it happens to do so EDEADLK is the
    apprpriate error return.

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