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Matheus
42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
#ifndef _TIMEKEEPER_H
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#define _TIMEKEEPER_H
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#include <time.h>
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#include <stdbool.h>
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#define TIMEKEEPER_SOURCE_FLAGS_EARLY 1 // can be used as an early timer
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typedef struct {
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time_t ticks_per_us;
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void *private;
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} timekeeper_source_info_t;
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typedef struct {
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const char *name;
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int priority;
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bool (*probe)(void); // returns true if the timer can currently be used
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timekeeper_source_info_t *(*init)(void); // initializes the timer, returning the info structure
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time_t (*ticks)(timekeeper_source_info_t *private); // returns a monotonic number of ticks
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int flags;
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} timekeeper_source_t;
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// initializes the highest priority source that can be used as an early timer and switches the cpu to use it
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void timekeeper_early_init(time_t us_offset);
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// initializes the highest priority source and switches the cpu to use it. uses the early timer for calibration if nescessary
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void timekeeper_init(void);
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// spins waiting for us to pass
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void timekeeper_wait_us(time_t us);
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timespec_t timekeeper_timefromboot(void);
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timespec_t timekeeper_time(void);
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#define TIMEKEEPER_SOURCE(x, ...) \
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static timekeeper_source_t x = { \
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__VA_ARGS__ \
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}; \
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__attribute__((section(".timekeeper_sources"), used)) static timekeeper_source_t *timekeeper_source_##x = &x;
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#endif
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