Hi, Yes you can call del_timer() even if the timer is not running, (assuming you must have done init_timer() on your timer struct). If the next & prev pointers in the struct list_head of timer struct are NULL, del_timer() returns 0. Thanks & regards, Suvidh Mathur -----Original Message----- From: aksingh@hss.hns.com [mailto:aksingh@hss.hns.com] Sent: Thursday, June 10, 2004 1:54 PM To: Tyler Cc: kernelnewbies@nl.linux.org Subject: Re: del_timer() Hi, My doubt was --- can I call del_timer for a timer for which I had NOT called add_timer ?, in this case the del_timer simply returns a 0, or is this an error and should NOT be done ? I ask this, becasue as I see it, there is no way to see if a timer is running, (something like pending_timer, it is not exported) and then call del_timer. regards Amit Tyler <tyler@agat.net>@nl.linux.org on 06/10/2004 01:14:13 AM Sent by: kernelnewbies-bounce@nl.linux.org To: kernelnewbies@nl.linux.org cc: Subject: Re: del_timer() aksingh@hss.hns.com wrote: > > > > HI, > > Can I call a del_timer() on a timer that is not currently running ? Is > this an error, i believe if del_timer returns 1 that means the timer was > running, if it returns zero, it wasnt running , right ? > > thanks > Amit > A timer is automatically deleted when it ends up or if you call del_timer. You should use del_timer_sync to avoid race conditions (in the case that the timer ends up when the function del_timer is executed). And if the base timer is not set, then del_timer returns 0 and the timer isn't deleted and otherwise it effectively delete the timer. -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
