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HP OpenVMS Systemsask the wizard |
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The Question is:
A floating point exception is generated from the code below at location
noted from what I gather from exceptions summary, bit 1 is set which means
Invalid operation is done. I could not see what is wrong.
I had encountered a similar problem in the past, in which case a CRTL pathch
was required, because there was a problem in the implicit type castings.
Is this the case here? as far as I know the system has the latest patches
applied. Their OVMS versio
n is 7.1-1H2
HELP!...
%SYSTEM-F-HPARITH, high performance arithmetic trap, Imask=00000000,
Fmask=00000400, summary=02, PC=FFFFFFFF8046A004, PS=0000001B
-SYSTEM-F-FLTINV, floating invalid operation, PC=FFFFFFFF8046A004,
PS=0000001B
%TRACE-F-TRACEBACK, symbolic stack dump follows
image module routine line rel PC abs PC
0 FFFFFFFF8046A004
FFFFFFFF8046A004
CIMIO_D3_DIOP CIOPERFSYNC perform_timesync
19609 00000000000000EC
00000000000452FC
CIMIO_D3_DIOP CIOGETDATA getdatapcm 21781 0000000000000E58
000000000003DBA8
CIMIO_D3_DIOP DEVICE Devupdate_device_list
21749 00000000000004CC
000000000003C2BC
CIMIO_D3_DIOP DEVICE device_get 21932 0000000000000D84
000000000003CB74
CIMIO_D3_DIOP CIMIO_DEVICE cimio_device_get
21019 00000000000027CC
000000000003B56C
CIMIO_D3_DIOP CIMIO_SERVER cimio_server_get
19984 0000000000001C68
0000000000035E08
CIMIO_D3_DIOP CIMIO_D3_DIOP main 19469 000000000000121C
000000000003121C
CIMIO_D3_DIOP CIMIO_D3_DIOP __main 0 00000000000000AC
00000000000300AC
0 FFFFFFFF83D9D0F8
FFFFFFFF83D9D0F8
****************Source******************
#define D3_WAIT_RESOLUTION 0.1 /* seconds */
void perform_timesync( char net, char unit )
int dtime;
int ccount;
float waittime=0;
dtime = (int) d3config->delaytime[net][unit];
ccount = (int) d3config->callcount[net][unit];
if ( dtime )
{
ccount--;
if ( ccount <= 0 )
{
/*
* Delay for delaytime 10th of a second
*/
waittime = (float) dtime * D3_WAIT_RESOLUTION; <<<problem here
lib$wait( &waittime );
ccount = d3config->groupsize[net][unit];
}
d3config->callcount[net][unit] = ccount;
}
} /* perform_timesync */
*****************************
all the values received by the function, ie, net, unit are valid values,
d3config is a pointer to a valid structure, and it gets the delaytime as a
valid interger value which we tried values from 10 to 1000. If delaytime
is set to 0 it does not go into the location where wait is happeing and
everything work out fine.
Whats the deal...
Thanks a bunch,
Ertugrul Akmese
The Answer is : By default, lib$wait requires a VAX F_floating point number, while the native floating point format of most OpenVMS Alpha compilers is IEEE. The OpenVMS Wizard would recommend looking at the use of the (optional) float-type argument that is available on the lib$wait call, or (somewhat less desirably) switching the module to build using f_floating numbers.
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