Messages in this thread | | | Date | Wed, 23 Nov 2005 10:56:43 +0800 | From | liyu <> | Subject | Re: [Question] I doublt on spin_lock again. |
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Zhang Le wrote:
> -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > liyu wrote: > > | 1. I found these use spin_lock(&rq->lock) in set_user_nice(), but > | not disable interrput ( e.g. when sys_nice() call it ), if the > | one timer interrput come before we unlock the spin_lock, Shall we > | dead lock here? Since the scheduler_tick() may try to hold the > | same lock. > > set_user_nice() -> task_rq_lock -> local_irq_save() > > | > | 2. # define __acquires(x) __attribute__((context(0,1))) # define > | __releases(x) __attribute__((context(1,0))) # define > | __acquire(x) __context__(1) # define __release(x) > | __context__(-1) > > info gcc > > BTW, have you ever read "HOWTO do Linux kernel development" be Greg? > Do it, if you haven't > > - -- > Zhang Le, Robert > Linux Engineer/Trainer > > ThizLinux Laboratory Limited > Address: Unit 1004, 10/F, Tower B, > Hunghom Commercial Centre, 37 Ma Tau Wai Road, > To Kwa Wan, Kowloon, Hong Kong > Telephone: (852) 2735 2725 > Mobile:(852) 9845 4336 > Fax: (852) 2111 0702 > URL: http://www.thizgroup.com > Public key: gpg --keyserver pgp.mit.edu --recv-keys 1E4E2973 > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.2 (GNU/Linux) > Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org > > iD8DBQFDg9kOvFHICB5OKXMRAg7BAJwIhyW9Qop4YGF9G56nzqImjy8UgQCfUE/g > b8pK2Fk6oW8ScK42krTZdOQ= > =mDfg > -----END PGP SIGNATURE----- > > > Thanks first.
1. I know local_irq_save() in task_rq_lock(), but it only save FLAGS register to one unsigned long variable, but not disable maskable interrupt. 2. OK, I am going to get it.
-liyu
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