-----Original Message----- From: kernelnewbies-bounce@xxxxxxxxxxxx [mailto:kernelnewbies-bounce@xxxxxxxxxxxx] On Behalf Of Andrea Gasparini Sent: Tuesday, July 17, 2007 1:53 PM To: kernelnewbies@xxxxxxxxxxxx Subject: Re: Mutex and Sleep Rajendra Stalekar spiffera, alle Tuesday 17 July 2007 circa: > which implies that if no lock is acquired it would sleep till it gets > it. I think you're quite confused, and that's a bad thing if you make confused other people. >> Thanks for the clarification , however I have source code of kernel 2.6.21.5 and if u check that kernel/mutex.c on line no. 86 u will find that it does have might_sleep function being called. This function is called in void inline fastcall __sched mutex_lock(struct mutex* ) function, a complete description of what it does is given just above this function. Let me know where else can I find mutex_lock function in that case. 1) migth_sleep doesn't have anything to do with mutex, if you control it's defined in kernel/sched.c:7101 (kernel 2.6.21.1). it only tells if that call is in a context that is allowed to sleep, but DON'T sleep. 2) the function that "sleep" in this case is the mutex itself. if you go through the function calls, you see that you arrive in mutex_lock_common, that has a for (;;) {... acquire code ... } that at near end calls schedule() that _can_ sleeps... :P Bye! -- -gaspa- ----------------------------------------------- --------- Powered by Debian GNU/Linux --------- ------ HomePage: iogaspa.altervista.org ------- -Il lunedi'dell'arrampicatore: www.lunedi.org - -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
