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Hello,
=20
I am using xalloc to get a block of memory for my data, my data is structur=
e with many variables, roughly about 512 word, so after I read manual of xa=
lloc, I should set 512x2 bytes memory for those data, but when I try to set=
512 as memory size, I still can save those data without any problem, I wou=
ld like to know why? And also I don=E2=80=99t understand sz explanation in =
the help below.=20
=20
=20
SYNTAX: long xalloc(long sz);
=20
DESCRIPTION: Allocates memory in extended memory. If xalloc() fails,
a run-time error will occur. This is a wrapper function for _xalloc(),
for backwards compatibility. It is the same as
_xalloc(&sz, 1, XALLOC_MAYBBB)
except that the actual allocated amount is not returned since the parameter
is not a pointer. The returned address is always even (word) aligned.
=20
NOTE: xalloc is not thread safe, since it accesses a global static structur=
e
with no locking.
=20
PARAMETER1: sz: The number of bytes to allocate. This is rounded up
to the next higher even number. ( what does it mean?)
=20
RETURN VALUE: The 20-bit physical address of the allocated data.
=20
KEYWORDS: xalloc, premain
=20
=20
=20
YANG HONG
Application Engineer/Technical Support
Omniverter Inc.
3075 14th Avenue
Unit #13
Markham, Ontario
L3R 0G9 Canada
Tel: 416 849 2299
Direct: 647 874 1505
USA: 440 290 4499
Fax: 416 849 2298
Web: www.omniverter.com <http://www.omniverter.com/>=20
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<p><div class=3D"WordSection1"><p class=3D"MsoNormal"><span style=3D"=
font-size:11.0pt;font-family:"Calibri",sans-serif;">Hello,<o></o>=
</span></p><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-fami=
ly:"Calibri",sans-serif;"><o> </o></span></p><p class=3D"Mso=
Normal"><span style=3D"font-size:11.0pt;font-family:"Calibri",san=
s-serif;">I am using xalloc to get a block of memory for my data, my data i=
s structure with many variables, roughly about 512 word, so after I read ma=
nual of xalloc, I should set 512x2 bytes memory for those data, but when I =
try to set 512 as memory size, I still can save those data without any prob=
lem, I would like to know why? And also I don=E2=80=99t understand sz expla=
nation in the help below. <o></o></span></p><p class=3D"MsoNormal"><span st=
yle=3D"font-size:11.0pt;font-family:"Calibri",sans-serif;"><o>&nb=
sp;</o></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;fo=
nt-family:"Calibri",sans-serif;"><o> </o></span></p><p class=
=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Calibri&qu=
ot;,sans-serif;">SYNTAX: long xalloc(long sz);<o></o></span></p><p class=3D=
"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Calibri"=
,sans-serif;"><o> </o></span></p><p class=3D"MsoNormal"><span style=3D=
"font-size:11.0pt;font-family:"Calibri",sans-serif;">DESCRIPTION:=
Allocates memory in extended memory.=C2=A0 If xalloc() fails,<o></o></span=
></p><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&qu=
ot;Calibri",sans-serif;">a run-time error will occur.=C2=A0 This is a =
wrapper function for _xalloc(),<o></o></span></p><p class=3D"MsoNormal"><sp=
an style=3D"font-size:11.0pt;font-family:"Calibri",sans-serif;">f=
or backwards compatibility.=C2=A0 It is the same as<o></o></span></p><p cla=
ss=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Calibri&=
quot;,sans-serif;">=C2=A0 _xalloc(&sz, 1, XALLOC_MAYBBB)<o></o></span><=
/p><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"=
;Calibri",sans-serif;">except that the actual allocated amount is not =
returned since the parameter<o></o></span></p><p class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:"Calibri",sans-serif;">is n=
ot a pointer.=C2=A0 The returned address is always even (word) aligned.<o><=
/o></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-f=
amily:"Calibri",sans-serif;"><o> </o></span></p><p class=3D"=
MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Calibri",=
sans-serif;">NOTE: xalloc is not thread safe, since it accesses a global st=
atic structure<o></o></span></p><p class=3D"MsoNormal"><span style=3D"font-=
size:11.0pt;font-family:"Calibri",sans-serif;">with no locking.<o=
></o></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font=
-family:"Calibri",sans-serif;"><o> </o></span></p><p class=
=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Calibri&qu=
ot;,sans-serif;">PARAMETER1: sz: <span style=3D"color:red;">The number of b=
ytes to allocate.=C2=A0 This is rounded up<o></o></span></span></p><p class=
=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Calibri&qu=
ot;,sans-serif;color:red;">to the next higher even number. ( what does it m=
ean?)<o></o></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11.0=
pt;font-family:"Calibri",sans-serif;"><o> </o></span></p><p =
class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Calib=
ri",sans-serif;">RETURN VALUE: The 20-bit physical address of the allo=
cated data.<o></o></span></p><p class=3D"MsoNormal"><span style=3D"font-siz=
e:11.0pt;font-family:"Calibri",sans-serif;"><o> </o></span><=
/p><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"=
;Calibri",sans-serif;">KEYWORDS: xalloc, premain<o></o></span></p><p c=
lass=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Calibr=
i",sans-serif;"><o> </o></span></p><p class=3D"MsoNormal"><span s=
tyle=3D"font-size:11.0pt;font-family:"Calibri",sans-serif;"><o>&n=
bsp;</o></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;f=
ont-family:"Calibri",sans-serif;"><o> </o></span></p><p clas=
s=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Calibri&q=
uot;,sans-serif;color:#0070C0;">YANG HONG<o></o></span></p><p class=3D"MsoN=
ormal"><i><span style=3D"font-size:11.0pt;font-family:"Calibri",s=
ans-serif;color:#0070C0;">Application Engineer/Technical Support<o></o></sp=
an></i></p><p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-f=
amily:"Calibri",sans-serif;color:#0070C0;">Omniverter Inc.<o></o>=
</span></i></p><p class=3D"MsoNormal"><i><span style=3D"font-size:9.0pt;fon=
t-family:"Verdana",sans-serif;color:#0070C0;">3075 14<sup>th</sup=
> Avenue<o></o></span></i></p><p class=3D"MsoNormal"><i><span style=3D"font=
-size:9.0pt;font-family:"Verdana",sans-serif;color:#0070C0;">Unit=
#13<br>Markham, Ontario<br>L3R 0G9 Canada</span></i><i><span style=3D"font=
-size:11.0pt;font-family:"Calibri",sans-serif;color:#0070C0;"><o>=
</o></span></i></p><p class=3D"MsoNormal"><i><span style=3D"font-size:9.0pt=
;font-family:"Verdana",sans-serif;color:#0070C0;">Tel: 416 849 22=
99<o></o></span></i></p><p class=3D"MsoNormal"><i><span style=3D"font-size:=
9.0pt;font-family:"Verdana",sans-serif;color:#0070C0;">Direct: 64=
7 874 1505<br>USA: 440 290 4499<br>Fax: 416 849 2298<o></o></span></i></p><=
p class=3D"MsoNormal"><i><span style=3D"font-size:9.0pt;font-family:"V=
erdana",sans-serif;color:#0070C0;">Web: <a href=3D"http://www.omnivert=
er.com/">www.omniverter.com</a></span></i><i><span style=3D"font-size:11.0p=
t;font-family:"Calibri",sans-serif;color:#0070C0;"><o></o></span>=
</i></p><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:=
"Calibri",sans-serif;"><o> </o></span></p><p class=3D"MsoNor=
mal"><span style=3D"font-size:11.0pt;font-family:"Calibri",sans-s=
erif;"><o> </o></span></p><p class=3D"MsoNormal"><span style=3D"font-s=
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font-family: Verdana;
}
#ygrp-msg p#attach-count span {
color: #1E66AE;
font-weight: 700;
}
#ygrp-reco #reco-head {
color: #ff7900;
font-weight: 700;
}
#ygrp-reco {
margin-bottom: 20px;
padding: 0px;
}
#ygrp-sponsor #ov li a {
font-size: 130%;
text-decoration: none;
}
#ygrp-sponsor #ov li {
font-size: 77%;
list-style-type: square;
padding: 6px 0;
}=20
#ygrp-sponsor #ov ul {
margin: 0;
padding: 0 0 0 8px;
}
#ygrp-text {
font-family: Georgia;
}
#ygrp-text p {
margin: 0 0 1em 0;
}
#ygrp-text tt {
font-size: 120%;
}
#ygrp-vital ul li:last-child {
border-right: none !important;=20
}=20
-->
</style>
</head>
<!--~-|**|PrettyHtmlEnd|**|-~-->
</html>
<!-- end group email -->
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