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#include <time.h>
#include <errno.h>
#include <sys/stat.h>
#if _WIN32
#include <sysinfoapi.h>
#endif
static struct timespec time_last_modified(char const *filename) {
#if __unix__
struct stat statbuf = {0};
stat(filename, &statbuf);
return statbuf.st_mtim;
#else
// windows' _stat does not have st_mtim
struct _stat statbuf = {0};
struct timespec ts = {0};
_stat(filename, &statbuf);
ts.tv_sec = statbuf.st_mtime;
return ts;
#endif
}
static int timespec_cmp(struct timespec a, struct timespec b) {
if (a.tv_sec > b.tv_sec) return 1;
if (a.tv_sec < b.tv_sec) return -1;
if (a.tv_nsec > b.tv_nsec) return 1;
if (a.tv_nsec < b.tv_nsec) return -1;
return 0;
}
static bool timespec_eq(struct timespec a, struct timespec b) {
return timespec_cmp(a, b) == 0;
}
static struct timespec timespec_max(struct timespec a, struct timespec b) {
return timespec_cmp(a, b) < 0 ? b : a;
}
static double timespec_to_seconds(struct timespec ts) {
return (double)ts.tv_sec
+ (double)ts.tv_nsec * 1e-9;
}
// returns a-b in seconds
static double timespec_sub(struct timespec a, struct timespec b) {
return (double)(a.tv_sec - b.tv_sec)
+ (double)(a.tv_nsec - b.tv_nsec) * 1e-9;
}
static struct timespec time_get(void) {
struct timespec ts = {0};
#if _WIN32
timespec_get(&ts, TIME_UTC);
#else
clock_gettime(CLOCK_REALTIME, &ts);
#endif
return ts;
}
static double time_get_seconds(void) {
return timespec_to_seconds(time_get());
}
// sleep for a certain number of nanoseconds
static void sleep_ns(u64 ns) {
#if __unix__
struct timespec rem = {0}, req = {
(time_t)(ns / 1000000000),
(long)(ns % 1000000000)
};
while (nanosleep(&req, &rem) == EINTR) // sleep interrupted by signal
req = rem;
#else
// windows....
Sleep((DWORD)(ns / 1000000));
#endif
}
// sleep for microseconds
static void time_sleep_us(u64 us) {
sleep_ns(us * 1000);
}
// sleep for milliseconds
static void time_sleep_ms(u64 ms) {
sleep_ns(ms * 1000000);
}
// sleep for seconds
static void time_sleep_s(u64 s) {
sleep_ns(s * 1000000000);
}
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