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LibC: Add timespec functions to sys/time.h

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And rewrite the timeval functions as inline functions.

Also add the non-standard but fairly common and useful
TIMEVAL_TO_TIMESPEC / TIMESPEC_TO_TIMEVAL functions.
This commit is contained in:
Nico Weber 2020-06-21 13:42:21 -04:00 • committed by Andreas Kling
parent 9256757b59
commit 29f509a2a0
1 changed files with 87 additions and 23 deletions
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110
Libraries/LibC/sys/time.h
View file

@ -28,32 +28,10 @@
#include <sys/cdefs.h>
#include <sys/types.h>
#include <time.h>
__BEGIN_DECLS
#define timerclear(tvp) (tvp)->tv_sec = (tvp)->tv_usec = 0
#define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
#define timercmp(tvp, uvp, cmp) \
(((tvp)->tv_sec == (uvp)->tv_sec) ? ((tvp)->tv_usec cmp(uvp)->tv_usec) : ((tvp)->tv_sec cmp(uvp)->tv_sec))
#define timeradd(a, b, out) \
do { \
(out)->tv_sec = (a)->tv_sec + (b)->tv_sec; \
(out)->tv_usec = (a)->tv_usec + (b)->tv_usec; \
if ((out)->tv_usec >= 1000000) { \
(out)->tv_sec++; \
(out)->tv_usec -= 1000000; \
} \
} while (0)
#define timersub(a, b, out) \
do { \
(out)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
(out)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
if ((out)->tv_usec < 0) { \
(out)->tv_sec--; \
(out)->tv_usec += 1000000; \
} \
} while (0)
struct timeval {
time_t tv_sec;
suseconds_t tv_usec;
@ -66,4 +44,90 @@ struct timezone {
int gettimeofday(struct timeval* __restrict__, void* __restrict__) __attribute__((nonnull(1)));
static inline void timeradd(const struct timeval* a, const struct timeval* b, struct timeval* out)
{
out->tv_sec = a->tv_sec + b->tv_sec;
out->tv_usec = a->tv_usec + b->tv_usec;
if (out->tv_usec >= 1000 * 1000) {
out->tv_sec++;
out->tv_usec -= 1000 * 1000;
}
}
static inline void timersub(const struct timeval* a, const struct timeval* b, struct timeval* out)
{
out->tv_sec = a->tv_sec - b->tv_sec;
out->tv_usec = a->tv_usec - b->tv_usec;
if (out->tv_usec < 0) {
out->tv_sec--;
out->tv_usec += 1000 * 1000;
}
}
static inline void timerclear(struct timeval* out)
{
out->tv_sec = out->tv_usec = 0;
}
static inline int timerisset(const struct timeval* tv)
{
return tv->tv_sec || tv->tv_usec;
}
#define timeradd timeradd
#define timersub timersub
#define timerclear timerclear
#define timerisset timerisset
#define timercmp(tvp, uvp, cmp) \
(((tvp)->tv_sec == (uvp)->tv_sec) ? ((tvp)->tv_usec cmp(uvp)->tv_usec) : ((tvp)->tv_sec cmp(uvp)->tv_sec))
static inline void timespecadd(const struct timespec* a, const struct timespec* b, struct timespec* out)
{
out->tv_sec = a->tv_sec + b->tv_sec;
out->tv_nsec = a->tv_nsec + b->tv_nsec;
if (out->tv_nsec >= 1000 * 1000 * 1000) {
out->tv_sec++;
out->tv_nsec -= 1000 * 1000 * 1000;
}
}
static inline void timespecsub(const struct timespec* a, const struct timespec* b, struct timespec* out)
{
out->tv_sec = a->tv_sec - b->tv_sec;
out->tv_nsec = a->tv_nsec - b->tv_nsec;
if (out->tv_nsec < 0) {
out->tv_sec--;
out->tv_nsec += 1000 * 1000 * 1000;
}
}
static inline void timespecclear(struct timespec* out)
{
out->tv_sec = out->tv_nsec = 0;
}
static inline int timespecisset(const struct timespec* ts)
{
return ts->tv_sec || ts->tv_nsec;
}
static inline void TIMEVAL_TO_TIMESPEC(const struct timeval* tv, struct timespec* ts)
{
ts->tv_sec = tv->tv_sec;
ts->tv_nsec = tv->tv_usec * 1000;
}
static inline void TIMESPEC_TO_TIMEVAL(struct timeval* tv, const struct timespec* ts)
{
tv->tv_sec = ts->tv_sec;
tv->tv_usec = ts->tv_nsec / 1000;
}
#define timespecadd timespecadd
#define timespecsub timespecsub
#define timespecclear timespecclear
#define timespecisset timespecisset
#define timespeccmp(ts, us, cmp) \
(((ts)->tv_sec == (us)->tv_sec) ? ((ts)->vf_nsec cmp(us)->tv_nsec) : ((ts)->tv_sec cmp(us)->tv_sec))
__END_DECLS