osfmk/kern/clock_oldops.c

35  *			alarm clock services. This file and the ipc
65  * Actual clock alarm structure. Used for user clock_sleep() and
66  * clock_alarm() calls. Alarms are allocated from the alarm free
67  * list and entered in time priority order into the active alarm
70 struct	alarm {
71 	struct	alarm	*al_next;		/* next alarm in chain */
72 	struct	alarm	*al_prev;		/* previous alarm in chain */
73 	int				al_status;		/* alarm status */
74 	mach_timespec_t	al_time;		/* alarm time */
75 	struct {				/* message alarm data */
76 		int				type;		/* alarm type */
77 		ipc_port_t		port;		/* alarm port */
79 						port_type;	/* alarm port type */
80 		struct	clock	*clock;		/* alarm clock */
81 		void			*data;		/* alarm data */
88 	long			al_seqno;		/* alarm sequence number */
90 typedef struct alarm	alarm_data_t;
92 /* alarm status */
93 #define ALARM_FREE	0		/* alarm is on free list */
96 #define ALARM_DONE	4		/* alarm has expired */
99 decl_simple_lock_data(static,alarm_lock)	/* alarm synchronization */
101 static struct	alarm		*alrmfree;		/* alarm free list pointer */
102 static struct	alarm		*alrmdone;		/* alarm done list pointer */
103 static struct	alarm		*alrmlist;
112 					alarm_t			alarm);
195 	/* start alarm sequence numbers at 0 */
239 	i = sizeof(struct alarm);
354 	case CLOCK_ALARM_CURRES:	/* =0 no alarm */
382 	case CLOCK_ALARM_CURRES:	/* =0 no alarm */
409  * Set the clock alarm resolution.
424  * Setup a clock alarm.
434 	alarm_t					alarm;
448 	 * Check alarm parameters. If parameters are invalid,
449 	 * send alarm message immediately.
461 	 * Get alarm and add to clock alarm list.
465 	if ((alarm = alrmfree) == 0) {
467 		alarm = (alarm_t) zalloc(alarm_zone);
468 		if (alarm == 0)
473 		alrmfree = alarm->al_next;
475 	alarm->al_status = ALARM_CLOCK;
476 	alarm->al_time = alarm_time;
477 	alarm->al_type = alarm_type;
478 	alarm->al_port = alarm_port;
479 	alarm->al_port_type = alarm_port_type;
480 	alarm->al_clock = clock;
481 	alarm->al_seqno = alrm_seqno++;
482 	post_alarm(alarm);
538 	alarm_t				alarm;
552 	 * return an error, otherwise post alarm request.
564 		 * Get alarm and add to clock alarm list.
568 		if ((alarm = alrmfree) == 0) {
570 			alarm = (alarm_t) zalloc(alarm_zone);
571 			if (alarm == 0)
576 			alrmfree = alarm->al_next;
579 		 * Wait for alarm to occur.
581 		wait_result = assert_wait((event_t)alarm, THREAD_ABORTSAFE);
583 			alarm->al_time = *sleep_time;
584 			alarm->al_status = ALARM_SLEEP;
585 			post_alarm(alarm);
591 			 * Note if alarm expired normally or whether it
592 			 * was aborted. If aborted, delete alarm from
593 			 * clock alarm list. Return alarm to free list.
596 			if (alarm->al_status != ALARM_DONE) {
598 				if (((alarm->al_prev)->al_next = alarm->al_next) != NULL)
599 					(alarm->al_next)->al_prev = alarm->al_prev;
602 			*sleep_time = alarm->al_time;
603 			alarm->al_status = ALARM_FREE;
606 			assert(alarm->al_status == ALARM_FREE);
609 		alarm->al_next = alrmfree;
610 		alrmfree = alarm;
620  * Service clock alarm expirations.
636 	 * Update clock alarm list. Alarms that are due are moved
648 		 * clock alarm list.
654 		 * If a clock_sleep() alarm, wakeup the thread
665 		 * If a clock_alarm() alarm, place the alarm on
666 		 * the alarm done list and schedule the alarm
683 	 * Setup to expire for the next pending alarm.
724  * Post an alarm on the active alarm list.
730 	alarm_t				alarm)
737 	 * Traverse alarm list until queue time is greater
738 	 * than alarm time, then insert alarm.
740 	alarm_time = &alarm->al_time;
748 	alrm1->al_next = alarm;
749 	alarm->al_next = alrm2;
750 	alarm->al_prev = alrm1;
752 		alrm2->al_prev  = alarm;
755 	 * If the inserted alarm is the 'earliest' alarm,
756 	 * reset the device layer alarm time accordingly.
758 	if (alrmlist == alarm)