09-29-2009
change
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Last edited by frankycool; 10-21-2009 at 09:46 AM..
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LEARN ABOUT CENTOS
del_timer_sync
DEL_TIMER_SYNC(9) Driver Basics DEL_TIMER_SYNC(9)
NAME
del_timer_sync - deactivate a timer and wait for the handler to finish.
SYNOPSIS
int del_timer_sync(struct timer_list * timer);
ARGUMENTS
timer
the timer to be deactivated
DESCRIPTION
This function only differs from del_timer on SMP: besides deactivating the timer it also makes sure the handler has finished executing on
other CPUs.
SYNCHRONIZATION RULES
Callers must prevent restarting of the timer, otherwise this function is meaningless. It must not be called from interrupt contexts unless
the timer is an irqsafe one. The caller must not hold locks which would prevent completion of the timer's handler. The timer's handler must
not call add_timer_on. Upon exit the timer is not queued and the handler is not running on any CPU.
NOTE
For !irqsafe timers, you must not hold locks that are held in interrupt context while calling this function. Even if the lock has nothing
to do with the timer in question. Here's why:
CPU0 CPU1 ---- ---- <SOFTIRQ> call_timer_fn; base->running_timer = mytimer; spin_lock_irq(somelock); <IRQ> spin_lock(somelock);
del_timer_sync(mytimer); while (base->running_timer == mytimer);
Now del_timer_sync will never return and never release somelock. The interrupt on the other CPU is waiting to grab somelock but it has
interrupted the softirq that CPU0 is waiting to finish.
The function returns whether it has deactivated a pending timer or not.
COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 DEL_TIMER_SYNC(9)