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Code Issues 1 Releases Wiki Activity

Added 'source' argument to os/clock to select the clock source

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This commit is contained in:
Ico Doornekamp 2023-05-20 11:41:25 +02:00
parent 61132d6c40
commit aaf3d08bcd
3 changed files with 44 additions and 9 deletions
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30
src/core/os.c
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@ -1278,14 +1278,32 @@ JANET_CORE_FN(os_time,
}
JANET_CORE_FN(os_clock,
"(os/clock)",
"Return the number of whole + fractional seconds since some fixed point in time. The clock "
"is guaranteed to be non-decreasing in real time.") {
"(os/clock &opt source)",
"Return the number of whole + fractional seconds of the requested clock source.\n\n"
"The `source` argument is the identifier of the particular clock source to use, when not "
"specified the default is `:realtime`:\n"
"- :realtime: Return the real (i.e., wall-clock) time. This clock is affected by discontinuous "
" jumps in the system time\n"
"- :monotonic: Return the number of whole + fractional seconds since some fixed point in "
" time. The clock is guaranteed to be non-decreasing in real time.\n"
"- :cputime: Return the CPU time consumed by this process (i.e. all threads in the process)\n") {
janet_sandbox_assert(JANET_SANDBOX_HRTIME);
janet_fixarity(argc, 0);
(void) argv;
janet_arity(argc, 0, 1);
enum JanetTimeSource source = JANET_TIME_REALTIME;
if (argc == 1) {
JanetKeyword sourcestr = janet_getkeyword(argv, 0);
if (janet_cstrcmp(sourcestr, "realtime") == 0) {
source = JANET_TIME_REALTIME;
} else if (janet_cstrcmp(sourcestr, "monotonic") == 0) {
source = JANET_TIME_MONOTONIC;
} else if (janet_cstrcmp(sourcestr, "cputime") == 0) {
source = JANET_TIME_CPUTIME;
} else {
janet_panicf("expected :real-time, :monotonic, or :cputime, got %v", argv[0]);
}
}
struct timespec tv;
if (janet_gettime(&tv)) janet_panic("could not get time");
if (janet_gettime(&tv, source)) janet_panic("could not get time");
double dtime = tv.tv_sec + (tv.tv_nsec / 1E9);
return janet_wrap_number(dtime);
}

16
src/core/util.c
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@ -901,8 +901,20 @@ int janet_gettime(struct timespec *spec) {
return 0;
}
#else
int janet_gettime(struct timespec *spec) {
return clock_gettime(CLOCK_MONOTONIC, spec);
int janet_gettime(struct timespec *spec, enum JanetTimeSource source) {
clockid_t cid = JANET_TIME_REALTIME;
switch (source) {
case JANET_TIME_REALTIME:
cid = CLOCK_REALTIME;
break;
case JANET_TIME_MONOTONIC:
cid = CLOCK_MONOTONIC;
break;
case JANET_TIME_CPUTIME:
cid = CLOCK_PROCESS_CPUTIME_ID;
break;
}
return clock_gettime(cid, spec);
}
#endif
#endif

7
src/core/util.h
View File

@ -126,7 +126,12 @@ void janet_core_cfuns_ext(JanetTable *env, const char *regprefix, const JanetReg
/* Clock gettime */
#ifdef JANET_GETTIME
int janet_gettime(struct timespec *spec);
enum JanetTimeSource {
JANET_TIME_REALTIME,
JANET_TIME_MONOTONIC,
JANET_TIME_CPUTIME
};
int janet_gettime(struct timespec *spec, enum JanetTimeSource source);
#endif
/* strdup */