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posix-timers: Add support for fd based clocks

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Extend the negative clockids which are currently used by posix cpu
timers to encode the PID with a file descriptor based type which
encodes the fd in the upper bits.

Originally-from: Richard Cochran <richard.cochran@omicron.at>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <johnstul@us.ibm.com>
LKML-Reference: <20110201134420.062860200@linutronix.de>
This commit is contained in:
Richard Cochran
2011-02-01 13:52:32 +00:00
committed by Thomas Gleixner
parent ce26efdefa
commit 81e294cba2
2 changed files with 14 additions and 1 deletions
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kernel/posix-timers.c
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@@ -488,7 +488,7 @@ static void release_posix_timer(struct k_itimer *tmr, int it_id_set)
static struct k_clock *clockid_to_kclock(const clockid_t id)
{
if (id < 0)
return &clock_posix_cpu;
return (id & CLOCKFD_MASK) == CLOCKFD ? NULL : &clock_posix_cpu;
if (id >= MAX_CLOCKS || !posix_clocks[id].clock_getres)
return NULL;