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Code Issues Releases 1 Activity

restore support of clock_gettime() for POSIX systems

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This should notably allow posix systems with timespec_get()
to have access to a high resolution timer,
instead of falling back to C90's clock_t.
This commit is contained in:
Yann Collet 2023-01-12 20:45:11 -08:00
parent bcfb7ad03c
commit a2ef23dec0
1 changed files with 31 additions and 8 deletions
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39
programs/timefn.c
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@ -12,8 +12,8 @@
/* === Dependencies === */
#include "timefn.h"
#include <time.h> /* TIME_UTC, then struct timespec and clock_t */
#include "platform.h" /* set _POSIX_C_SOURCE */
#include <time.h> /* CLOCK_MONOTONIC, TIME_UTC */
/*-****************************************
* Time functions
@ -37,8 +37,10 @@ UTIL_time_t UTIL_getTime(void)
init = 1;
}
{ UTIL_time_t r;
r.t = (PTime)(QueryPerformanceCounter(&x).QuadPart * 1000000000ULL / ticksPerSecond.QuadPart);
return ;
LARGE_INTEGER x;
QueryPerformanceCounter(&x);
r.t = (PTime)(x.QuadPart * 1000000000ULL / ticksPerSecond.QuadPart);
return r;
}
}
@ -61,10 +63,31 @@ UTIL_time_t UTIL_getTime(void)
}
}
/* POSIX.1-2001 (optional) */
#elif defined(CLOCK_MONOTONIC)
/* C11 requires timespec_get().
* However, FreeBSD 11 claims C11 compliance but lacks timespec_get().
* Double confirm by requiring the definition of TIME_UTC.
#include <stdlib.h> /* abort */
#include <stdio.h> /* perror */
UTIL_time_t UTIL_getTime(void)
{
/* time must be initialized, othersize it may fail msan test.
* No good reason, likely a limitation of timespec_get() for some target */
struct timespec time = { 0, 0 };
if (clock_gettime(CLOCK_MONOTONIC, &time) != 0) {
perror("timefn::clock_gettime(CLOCK_MONOTONIC)");
abort();
}
{ UTIL_time_t r;
r.t = (PTime)time.tv_sec * 1000000000ULL + (PTime)time.tv_nsec;
return r;
}
}
/* C11 requires support of timespec_get().
* However, FreeBSD 11 claims C11 compliance while lacking timespec_get().
* Double confirm timespec_get() support by checking the definition of TIME_UTC.
* However, some versions of Android manage to simultanously define TIME_UTC
* and lack timespec_get() support... */
#elif (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L) /* C11 */) \
@ -79,7 +102,7 @@ UTIL_time_t UTIL_getTime(void)
* No good reason, likely a limitation of timespec_get() for some target */
struct timespec time = { 0, 0 };
if (timespec_get(&time, TIME_UTC) != TIME_UTC) {
perror("timefn::timespec_get");
perror("timefn::timespec_get(TIME_UTC)");
abort();
}
{ UTIL_time_t r;