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Improve quality of our ANSI C clock() function

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It now works most excellently across all supported operating
sytsems (earlier it didn't work on NT and XNU). Demo code is
available in examples/clock.c and this change also adds some
of the newer ANSI C time functions like timespec_get(), plus
timespec_getres() which hasn't even come out yet as it's C23
This commit is contained in:
Justine Tunney 2022-09-05 21:43:49 -07:00
parent 7ff0ea8c13
commit 12d9e1e128
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GPG key ID: BE714B4575D6E328
24 changed files with 254 additions and 76 deletions
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11
libc/intrin/kprintf.greg.c
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@ -17,10 +17,6 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#define ShouldUseMsabiAttribute() 1
#include "libc/intrin/bits.h"
#include "libc/intrin/likely.h"
#include "libc/intrin/safemacros.internal.h"
#include "libc/intrin/weaken.h"
#include "libc/calls/calls.h"
#include "libc/calls/state.internal.h"
#include "libc/calls/syscall-sysv.internal.h"
@ -28,11 +24,15 @@
#include "libc/errno.h"
#include "libc/fmt/divmod10.internal.h"
#include "libc/fmt/fmt.h"
#include "libc/intrin/bits.h"
#include "libc/intrin/cmpxchg.h"
#include "libc/intrin/kprintf.h"
#include "libc/intrin/likely.h"
#include "libc/intrin/lockcmpxchg.h"
#include "libc/intrin/nomultics.internal.h"
#include "libc/intrin/safemacros.internal.h"
#include "libc/intrin/spinlock.h"
#include "libc/intrin/weaken.h"
#include "libc/limits.h"
#include "libc/log/internal.h"
#include "libc/macros.internal.h"
@ -53,7 +53,6 @@
#include "libc/str/utf16.h"
#include "libc/sysv/consts/nr.h"
#include "libc/sysv/consts/prot.h"
#include "libc/time/clockstonanos.internal.h"
extern hidden struct SymbolTable *__symtab;
@ -306,7 +305,7 @@ privileged static size_t kformat(char *b, size_t n, const char *fmt,
continue;
case 'T':
x = ClocksToNanos(rdtsc(), kStartTsc) % 86400000000000;
x = (rdtsc() - kStartTsc) / 3 % 86400000000000;
goto FormatUnsigned;
case 'P':