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authorRichard Cochran <richardcochran@gmail.com>2011-02-01 13:52:35 +0000
committerThomas Gleixner <tglx@linutronix.de>2011-02-02 15:28:20 +0100
commit0606f422b453f76c31ab2b1bd52943ff06a2dcf2 (patch)
tree14f4859e8492f01e97140248a28ab98355c415cf /include/linux/posix-timers.h
parent527087374faa488776a789375a7d6ea74fda6f71 (diff)
posix clocks: Introduce dynamic clocks
This patch adds support for adding and removing posix clocks. The clock lifetime cycle is patterned after usb devices. Each clock is represented by a standard character device. In addition, the driver may optionally implement custom character device operations. The posix clock and timer system calls listed below now work with dynamic posix clocks, as well as the traditional static clocks. The following system calls are affected: - clock_adjtime (brand new syscall) - clock_gettime - clock_getres - clock_settime - timer_create - timer_delete - timer_gettime - timer_settime [ tglx: Adapted to the posix-timer cleanup. Moved clock_posix_dynamic to posix-clock.c and made all referenced functions static ] Signed-off-by: Richard Cochran <richard.cochran@omicron.at> Acked-by: John Stultz <johnstul@us.ibm.com> LKML-Reference: <20110201134420.164172635@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/posix-timers.h')
-rw-r--r--include/linux/posix-timers.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 9d6ffe2c92e5..d51243ae0726 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -32,7 +32,7 @@ struct cpu_timer_list {
#define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3))
#define CPUCLOCK_PERTHREAD(clock) \
(((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0)
-#define CPUCLOCK_PID_MASK 7
+
#define CPUCLOCK_PERTHREAD_MASK 4
#define CPUCLOCK_WHICH(clock) ((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK)
#define CPUCLOCK_CLOCK_MASK 3
@@ -48,6 +48,9 @@ struct cpu_timer_list {
#define MAKE_THREAD_CPUCLOCK(tid, clock) \
MAKE_PROCESS_CPUCLOCK((tid), (clock) | CPUCLOCK_PERTHREAD_MASK)
+#define FD_TO_CLOCKID(fd) ((~(clockid_t) (fd) << 3) | CLOCKFD)
+#define CLOCKID_TO_FD(clk) ((unsigned int) ~((clk) >> 3))
+
/* POSIX.1b interval timer structure. */
struct k_itimer {
struct list_head list; /* free/ allocate list */
@@ -100,6 +103,7 @@ struct k_clock {
};
extern struct k_clock clock_posix_cpu;
+extern struct k_clock clock_posix_dynamic;
void posix_timers_register_clock(const clockid_t clock_id, struct k_clock *new_clock);