about XSync extension problem.

[lantian ai]

Hello ajax:

Thanks for your help .

That is the reason. I checked the configure log, My cross toolchain
don't support this function.

ailantian at vax:~/stuff/workspace/work/armv7a-ThunderST-linux-gnueabi/xserver-xorg-2_1.6.2-r1/xorg-server-1.6.2$
grep MONOTONIC_CLOCK * -R
autom4te.cache/output.0:  MONOTONIC_CLOCK="cross compiling"
autom4te.cache/output.0:  MONOTONIC_CLOCK=yes
autom4te.cache/output.0:MONOTONIC_CLOCK=no
autom4te.cache/output.0:    MONOTONIC_CLOCK=no
autom4te.cache/output.0:{ echo "$as_me:$LINENO: result: $MONOTONIC_CLOCK" >&5
autom4te.cache/output.0:echo "${ECHO_T}$MONOTONIC_CLOCK" >&6; }
autom4te.cache/output.0:if test "x$MONOTONIC_CLOCK" = xyes; then
autom4te.cache/output.0:@%:@define MONOTONIC_CLOCK 1
autom4te.cache/output.1:  MONOTONIC_CLOCK="cross compiling"
autom4te.cache/output.1:  MONOTONIC_CLOCK=yes
autom4te.cache/output.1:MONOTONIC_CLOCK=no
autom4te.cache/output.1:    MONOTONIC_CLOCK=no
autom4te.cache/output.1:{ echo "$as_me:$LINENO: result: $MONOTONIC_CLOCK" >&5
autom4te.cache/output.1:echo "${ECHO_T}$MONOTONIC_CLOCK" >&6; }
autom4te.cache/output.1:if test "x$MONOTONIC_CLOCK" = xyes; then
autom4te.cache/output.1:@%:@define MONOTONIC_CLOCK 1
autom4te.cache/output.2:  MONOTONIC_CLOCK="cross compiling"
autom4te.cache/output.2:  MONOTONIC_CLOCK=yes
autom4te.cache/output.2:MONOTONIC_CLOCK=no
autom4te.cache/output.2:    MONOTONIC_CLOCK=no
autom4te.cache/output.2:{ echo "$as_me:$LINENO: result: $MONOTONIC_CLOCK" >&5
autom4te.cache/output.2:echo "${ECHO_T}$MONOTONIC_CLOCK" >&6; }
autom4te.cache/output.2:if test "x$MONOTONIC_CLOCK" = xyes; then
autom4te.cache/output.2:@%:@define MONOTONIC_CLOCK 1
autom4te.cache/traces.0:m4trace:configure.ac:771: -1-
m4_pattern_allow([^MONOTONIC_CLOCK$])
autom4te.cache/traces.1:m4trace:configure.ac:771: -1-
AC_DEFINE_TRACE_LITERAL([MONOTONIC_CLOCK])
autom4te.cache/traces.1:m4trace:configure.ac:771: -1-
m4_pattern_allow([^MONOTONIC_CLOCK$])
autom4te.cache/traces.1:m4trace:configure.ac:771: -1-
AH_OUTPUT([MONOTONIC_CLOCK], [/* Have monotonic clock from
clock_gettime() */
autom4te.cache/traces.1:#undef MONOTONIC_CLOCK])
autom4te.cache/traces.2:m4trace:configure.ac:771: -1-
AC_DEFINE_TRACE_LITERAL([MONOTONIC_CLOCK])
autom4te.cache/traces.2:m4trace:configure.ac:771: -1-
m4_pattern_allow([^MONOTONIC_CLOCK$])
autom4te.cache/traces.2:m4trace:configure.ac:771: -1-
AH_OUTPUT([MONOTONIC_CLOCK], [/* Have monotonic clock from
clock_gettime() */
autom4te.cache/traces.2:#undef MONOTONIC_CLOCK])
configure:  MONOTONIC_CLOCK="cross compiling"
configure:  MONOTONIC_CLOCK=yes
configure:MONOTONIC_CLOCK=no
configure:    MONOTONIC_CLOCK=no
configure:{ echo "$as_me:$LINENO: result: $MONOTONIC_CLOCK" >&5
configure:echo "${ECHO_T}$MONOTONIC_CLOCK" >&6; }
configure:if test "x$MONOTONIC_CLOCK" = xyes; then
configure:#define MONOTONIC_CLOCK 1
configure.ac:    ], [MONOTONIC_CLOCK=yes], [MONOTONIC_CLOCK=no],
configure.ac:       [MONOTONIC_CLOCK="cross compiling"])
configure.ac:    MONOTONIC_CLOCK=no
configure.ac:AC_MSG_RESULT([$MONOTONIC_CLOCK])
configure.ac:if test "x$MONOTONIC_CLOCK" = xyes; then
configure.ac:    AC_DEFINE(MONOTONIC_CLOCK, 1, [Have monotonic clock
from clock_gettime()])
cscope.out:MONOTONIC_CLOCK
cscope.out:	m_SC_MONOTONIC_CLOCK
cscope.out:	#_SC_MONOTONIC_CLOCK
cscope.out:_SC_MONOTONIC_CLOCK
cscope.out:	#_POSIX_MONOTONIC_CLOCK
Binary file hw/vfb/.libs/Xvfb matches
Binary file hw/kdrive/sdl/.libs/Xsdl matches
Binary file hw/kdrive/ephyr/.libs/Xephyr matches
Binary file hw/xfree86/.libs/Xorg matches
include/dix-config.h:/* #undef MONOTONIC_CLOCK */
include/do-not-use-config.h.in:#undef MONOTONIC_CLOCK
include/do-not-use-config.h.in~:#undef MONOTONIC_CLOCK
include/do-not-use-config.h:/* #undef MONOTONIC_CLOCK */
include/dix-config.h.in:#undef MONOTONIC_CLOCK
Binary file os/.libs/libos.a matches
Binary file os/.libs/xstrans.o matches
Binary file os/.libs/connection.o matches
os/utils.c:#ifdef MONOTONIC_CLOCK


I tried the programme in configure scripts

#include <time.h>

int main(int argc, char *argv[]) {
    struct timespec tp;

    if (clock_gettime(CLOCK_MONOTONIC, &tp) == 0)
        return 0;
    else
        return 1;
}


ailantian at vax:~/mypg$ export PATH=$PATH:~/stuff/workspace/cross/armv7a/bin/
ailantian at vax:~/mypg$ arm-ThunderST-linux-gnueabi-gcc clock.c -o clock
/tmp/ccqZa0a0.o: In function `main':
clock.c:(.text+0x20): undefined reference to `clock_gettime'
collect2: ld returned 1 exit status
ailantian at vax:~/mypg$


Thanks very much.

Could I do some work to fix this problem?

My Xorg is using gettimeofday  now, so when I change time, XSync will fail.

Thanks

Best regards

ailantian

2009/11/18 Adam Jackson <ajax at nwnk.net>:
> On Tue, 2009-11-17 at 10:21 +0800, lantian ai wrote:
>
>> _X_EXPORT CARD32
>> GetTimeInMillis(void)
>> {
>>    struct timeval tv;
>>
>> #ifdef MONOTONIC_CLOCK
>>    struct timespec tp;
>>    if (clock_gettime(CLOCK_MONOTONIC, &tp) == 0)
>>        return (tp.tv_sec * 1000) + (tp.tv_nsec / 1000000L);
>> #endif
>>
>>    X_GETTIMEOFDAY(&tv);
>>    return(tv.tv_sec * 1000) + (tv.tv_usec / 1000);
>> }
>>
>> May be on desktop  we use clock_gettime, on arm we use gettimeofday.
>>
>> But when we change the time , both will change? isn't it?
>
> If we were using clock_gettime(CLOCK_REALTIME), then changes to the
> system date and time would affect us, same as with gettimeofday().  This
> is in fact the _entire_ reason that we use CLOCK_MONOTONIC instead; X's
> internal notion of time is related to elapsed time, and not to whatever
> the user happened to set the date to.
>
> - ajax
>