On Mon, Oct 10, 2005 at 12:49:01 +0900, NAHieu wrote: > I am writing a kernel module, and there is an I/O function (which > might sleep in the queue to wait for IO event). > > I want to export this function (EXPORT_SYMBOL), so other modules or > kernel code can use it. The problem is: I am afraid that if this > function is called at the same time (one is running in module, and at > the same time other module calls it), there can be conflict. Is that > really possible? If there is a race, it is there even if you don't export the function. Flow of control is independent on modules. > If the problem is possible, how can I solve it? Is mutex the answer to > this problem? There is nothing that's actually called "mutex". I suppose you mean semaphore. Yes, you can use it. On the other hand you should not be afraid -- you should *know*. -- Jan 'Bulb' Hudec <bulb@xxxxxx>
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