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posix-timers: Introduce clockid_to_kclock()

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New function to find the kclock for a given clockid.

Returns a pointer to clock_posix_cpu if clockid < 0. If clockid >=
MAXCLOCK or if the clock_getres pointer is not set it returns
NULL. For valid clocks it returns a pointer to the matching
posix_clock.

Signed-off-by: Thomas Gleixner <[email protected]>
Cc: John Stultz <[email protected]>
Acked-by: Richard Cochran <[email protected]>
LKML-Reference: <[email protected]>
This commit is contained in:
Thomas Gleixner 2011-02-01 13:51:09 +00:00
commit cc785ac22b
1 changed files with 10 additions and 0 deletions
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10
kernel/posix-timers.c
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@ -531,6 +531,16 @@ static void release_posix_timer(struct k_itimer *tmr, int it_id_set)
kmem_cache_free(posix_timers_cache, tmr);
}
static struct k_clock *clockid_to_kclock(const clockid_t id)
{
if (id < 0)
return &clock_posix_cpu;
if (id >= MAX_CLOCKS || !posix_clocks[id].clock_getres)
return NULL;
return &posix_clocks[id];
}
/* Create a POSIX.1b interval timer. */
SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,