Time management


Files
file	clock.h
file	delay.h
file	timeout.h
file	clock.c
	High-level clock interrupt handler.
file	delay.c
	Active delay function.
file	timeout.c
	Timeout management functions.
Data Structures
struct	timeout
struct	ptime
Defines
#define	HZ 100
#define	us2ticks(us) ((__u64)(((__u32) (us)/(1000000/HZ))))
Typedefs
typedef void(*	timeout_handler_t )(void *arg)
Functions
void	clock (void)
void	clock_counter_init (void)
void	delay (__u32 microseconds)
void	timeout_init (void)
void	timeout_initialize (timeout_t *t)
void	timeout_reinitialize (timeout_t *t)
void	timeout_register (timeout_t t, __u64 usec, timeout_handler_t f, void arg)
bool	timeout_unregister (timeout_t *t)
static void	clock_update_counters (void)
Variables
ptime *	public_time
static __native	secfrag = 0

Define Documentation

#define HZ 100

Definition at line 38 of file clock.h.
Referenced by clock_update_counters(), i8254_normal_operation(), and l_apic_init().

#define us2ticks ( us ) ((__u64)(((__u32) (us)/(1000000/HZ))))

Definition at line 43 of file timeout.h.
Referenced by timeout_register().

Typedef Documentation

typedef void(* timeout_handler_t)(void *arg)

Definition at line 45 of file timeout.h.

Function Documentation

void clock ( void )

Clock routine
Clock routine executed from clock interrupt handler (assuming interrupts_disable()'d). Runs expired timeouts and preemptive scheduling.
Definition at line 125 of file clock.c.
References timeout::arg, clock_update_counters(), CPU, f, timeout::handler, list_get_instance, list_remove(), spinlock_lock, spinlock_unlock(), timeout::ticks, and timeout_reinitialize().
Referenced by i8254_interrupt(), and l_apic_timer_interrupt().
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void clock_counter_init ( void )

Initialize realtime clock counter
The applications (and sometimes kernel) need to access accurate information about realtime data. We allocate 1 page with these data and update it periodically.
Definition at line 78 of file clock.c.
References frame_alloc, FRAME_ATOMIC, NULL, panic, PFN2ADDR(), public_time, ptime::seconds1, ptime::seconds2, sysinfo_set_item_val(), and ptime::useconds.
Referenced by main_bsp_separated_stack().
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static void clock_update_counters ( void ) [static]

Update public counters
Update it only on first processor TODO: Do we really need so many write barriers?
Definition at line 102 of file clock.c.
References CPU, HZ, public_time, secfrag, ptime::seconds1, ptime::seconds2, ptime::useconds, and write_barrier.
Referenced by clock().

void delay ( __u32 usec )

Active delay
Delay the execution for the given number of microseconds (or slightly more). The delay is implemented as CPU calibrated active loop.

Parameters:

usec Number of microseconds to sleep.

Definition at line 52 of file delay.c.
References asm_delay_loop(), CPU, interrupts_disable(), and interrupts_restore().
Referenced by i8254_calibrate_delay_loop(), l_apic_init(), l_apic_send_init_ipi(), and scheduler_separated_stack().
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void timeout_init ( void )

Initialize timeouts
Initialize kernel timeouts.
Definition at line 55 of file timeout.c.
References CPU, list_initialize(), and spinlock_initialize().
Referenced by main_ap_separated_stack(), and main_bsp_separated_stack().
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void timeout_initialize ( timeout_t * t )

Initialize timeout
Initialize all members including the lock.

Parameters:

t Timeout to be initialized.

Definition at line 86 of file timeout.c.
References spinlock_initialize(), and timeout_reinitialize().
Referenced by thread_create().
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void timeout_register ( timeout_t * t,

__u64 time,

timeout_handler_t f,

void * arg

)

Register timeout
Insert timeout handler f (with argument arg) to timeout list and make it execute in time microseconds (or slightly more).

Parameters:

t Timeout structure.

time Number of usec in the future to execute the handler.

f Timeout handler function.

arg Timeout handler argument.

Definition at line 106 of file timeout.c.
References timeout::arg, timeout::cpu, CPU, timeout::handler, interrupts_disable(), interrupts_restore(), timeout::link, list_get_instance, list_prepend(), link::next, NULL, panic, link::prev, spinlock_lock, spinlock_unlock(), timeout::ticks, and us2ticks.
Referenced by waitq_sleep_timeout_unsafe().
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void timeout_reinitialize ( timeout_t * t )

Reinitialize timeout
Initialize all members except the lock.

Parameters:

t Timeout to be initialized.

Definition at line 69 of file timeout.c.
References timeout::arg, timeout::cpu, timeout::handler, timeout::link, link_initialize(), NULL, and timeout::ticks.
Referenced by clock(), timeout_initialize(), and timeout_unregister().
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