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ape: add internal _NSEC() function and make gettimeofday() use it

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This commit is contained in:
cinap_lenrek 2016-04-10 02:52:31 +02:00
parent 3ba1197aeb
commit 5e37087451
3 changed files with 48 additions and 37 deletions
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43
sys/src/ape/lib/ap/plan9/9nsec.c Normal file
View file

@ -0,0 +1,43 @@
#include "sys9.h"
typedef unsigned long long uvlong;
typedef long long vlong;
typedef unsigned char uchar;
static uvlong order = 0x0001020304050607ULL;
static void
be2vlong(vlong *to, uchar *f)
{
uchar *t, *o;
int i;
t = (uchar*)to;
o = (uchar*)ℴ
for(i = 0; i < 8; i++)
t[o[i]] = f[i];
}
long long
_NSEC(void)
{
uchar b[8];
vlong t;
int opened;
static int fd = -1;
opened = 0;
for(;;) {
if(fd < 0)
if(opened++ ||
(fd = _OPEN("/dev/bintime", OREAD|OCEXEC)) < 0)
return 0;
if(_PREAD(fd, b, sizeof b, 0) == sizeof b)
break; /* leave fd open for future use */
/* short read, perhaps try again */
_CLOSE(fd);
fd = -1;
}
be2vlong(&t, b);
return t;
}

1
sys/src/ape/lib/ap/plan9/mkfile
View file

@ -11,6 +11,7 @@ OFILES=\
_getpw.$O\
_nap.$O\
9mallocz.$O\
9nsec.$O\
9iounit.$O\
9read.$O\
9readn.$O\

41
sys/src/ape/lib/bsd/gettimeofday.c
View file

@ -1,49 +1,16 @@
#include <sys/types.h>
#include <time.h>
#include <sys/time.h>
#include <string.h>
#include "sys9.h"
typedef unsigned long long uvlong;
typedef long long vlong;
typedef unsigned char uchar;
static uvlong order = 0x0001020304050607ULL;
static void
be2vlong(vlong *to, uchar *f)
{
uchar *t, *o;
int i;
t = (uchar*)to;
o = (uchar*)&order;
for(i = 0; i < 8; i++)
t[o[i]] = f[i];
}
/* ap/plan9/9nsec.c */
extern long long _NSEC(void);
int
gettimeofday(struct timeval *tp, struct timezone *tzp)
{
uchar b[8];
vlong t;
int opened;
static int fd = -1;
opened = 0;
for(;;) {
if(fd < 0)
if(opened++ ||
(fd = _OPEN("/dev/bintime", OREAD|OCEXEC)) < 0)
return 0;
if(_PREAD(fd, b, sizeof b, 0) == sizeof b)
break; /* leave fd open for future use */
/* short read, perhaps try again */
_CLOSE(fd);
fd = -1;
}
be2vlong(&t, b);
long long t;
t = _NSEC();
tp->tv_sec = t/1000000000;
tp->tv_usec = (t/1000)%1000000;