mirror of
https://github.com/RIOT-OS/RIOT.git
synced 2024-12-29 04:50:03 +01:00
139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/**
|
|
* @defgroup sys_vtimer Virtual (Software) Timer library
|
|
* @ingroup sys
|
|
* @brief Virtual software timer for general timer functionality in applications
|
|
* @{
|
|
*
|
|
* @file vtimer.h
|
|
* @brief VTimer API
|
|
*
|
|
* The vtimer library provides functions for setting, resetting and restarting
|
|
* software timers, and for checking if a vtimer has expired.
|
|
*
|
|
* (As of now, not resetting, restarting, removing and checking are not implemented)
|
|
*
|
|
* @author unknown
|
|
*/
|
|
|
|
#ifndef __VTIMER_H
|
|
#define __VTIMER_H
|
|
|
|
#include <time.h>
|
|
#include <sys/time.h>
|
|
|
|
#include "priority_queue.h"
|
|
#include "timex.h"
|
|
#include "msg.h"
|
|
|
|
#define MSG_TIMER 12345
|
|
|
|
/**
|
|
* A vtimer object.
|
|
*
|
|
* This structure is used for declaring a vtimer. This should not be used by programmers, use the vtimer_set_*-functions instead.
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
typedef struct vtimer_t {
|
|
priority_queue_node_t priority_queue_entry;
|
|
timex_t absolute;
|
|
void (*action)(struct vtimer_t *timer);
|
|
void *arg;
|
|
kernel_pid_t pid;
|
|
} vtimer_t;
|
|
|
|
/**
|
|
* @brief Current system time
|
|
* @return Time as timex_t since system boot
|
|
*/
|
|
void vtimer_now(timex_t *out);
|
|
|
|
/**
|
|
* @brief Get the current time in seconds and microseconds since system start
|
|
* @param[in] tp Uptime will be stored in the timeval structure pointed to by tp
|
|
*/
|
|
void vtimer_gettimeofday(struct timeval *tp);
|
|
|
|
/**
|
|
* @brief Returns the current time in broken down format
|
|
* @param[out] localt Pointer to structure to receive time
|
|
*/
|
|
void vtimer_get_localtime(struct tm *localt);
|
|
|
|
/**
|
|
* @brief Initializes the vtimer subsystem. To be called once at system initialization. Will be initialized by auto_init.
|
|
*
|
|
* @return always 0
|
|
*/
|
|
int vtimer_init(void);
|
|
|
|
/**
|
|
* @brief will cause the calling thread to be suspended from excecution until the number of microseconds has elapsed
|
|
* @param[in] us number of microseconds
|
|
* @return 0 on success, < 0 on error
|
|
*/
|
|
int vtimer_usleep(uint32_t us);
|
|
|
|
/**
|
|
* @brief will cause the calling thread to be suspended from excecution until the time specified by time has elapsed
|
|
* @param[in] time timex_t with time to suspend execution
|
|
* @return 0 on success, < 0 on error
|
|
*/
|
|
int vtimer_sleep(timex_t time);
|
|
|
|
/**
|
|
* @brief set a vtimer with msg event handler
|
|
* @param[in] t pointer to preinitialised vtimer_t
|
|
* @param[in] interval vtimer timex_t interval
|
|
* @param[in] pid process id
|
|
* @param[in] ptr message value
|
|
* @return 0 on success, < 0 on error
|
|
*/
|
|
int vtimer_set_msg(vtimer_t *t, timex_t interval, kernel_pid_t pid, void *ptr);
|
|
|
|
/**
|
|
* @brief set a vtimer with wakeup event
|
|
* @param[in] t pointer to preinitialised vtimer_t
|
|
* @param[in] pid process id
|
|
* @return 0 on success, < 0 on error
|
|
*/
|
|
int vtimer_set_wakeup(vtimer_t *t, timex_t interval, kernel_pid_t pid);
|
|
|
|
/**
|
|
* @brief remove a vtimer
|
|
* @param[in] t pointer to preinitialised vtimer_t
|
|
* @return 0 on success, < 0 on error
|
|
*/
|
|
int vtimer_remove(vtimer_t *t);
|
|
|
|
|
|
/**
|
|
* @brief receive a message but return in case of timeout time is passed by without a new message
|
|
* @param[out] m pointer to a msg_t which will be filled in case of no timeout
|
|
* @param[in] timeout timex_t containing the relative time to fire the timeout
|
|
* @return < 0 on error, other value otherwise
|
|
*/
|
|
int vtimer_msg_receive_timeout(msg_t *m, timex_t timeout);
|
|
|
|
#if ENABLE_DEBUG
|
|
|
|
/**
|
|
* @brief Prints a vtimer_t
|
|
*/
|
|
void vtimer_print(vtimer_t *t);
|
|
|
|
/**
|
|
* @brief Prints the vtimer shortterm queue (use for debug purposes)
|
|
*/
|
|
void vtimer_print_short_queue(void);
|
|
|
|
/**
|
|
* @brief Prints the vtimer longterm queue (use for debug purposes)
|
|
*/
|
|
void vtimer_print_long_queue(void);
|
|
|
|
#endif
|
|
|
|
/** @} */
|
|
#endif /* __VTIMER_H */
|