<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12pt"><div>I'll try to clarify the problem.</div><div>I have a char * in my code, which I want to erl_send to the erlang node. The erl_send function accepts as input an ETERM* pointer. I need to turn char* to ETERM*. The current way is by erl_mk_binary, which allocates memory.</div><div>Is there a way to pass the char * to erl_send without the unnecessary memory allocation.</div><div><br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span style="background-color: transparent;">I thought of pre-creating an ETERM struct, and only changing the binary pointer to the char* (before running erl_send). This way I can send multiple char* buffers without the
need to create multiple ETERM pointers.</span><br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span style="background-color: transparent;"><br></span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span style="background-color: transparent;">The point of all this is to reduce run-time for the erl_send process</span></div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 12pt;"> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size:
12pt;"> <div dir="ltr"> <font size="2" face="Arial"> On Monday, September 8, 2014 12:55 PM, Guilherme Andrade <g@gandrade.net> wrote:<br> </font> </div> <br><br> <div class="y_msg_container"><div id="yiv8655810684"><div>
(Sorry, missed the subject -- you are indeed talking about a C node.
Please ignore some of my previous phrasing.)<br clear="none">
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<div class="yiv8655810684moz-cite-prefix">On 08/09/14 10:34, Guilherme Andrade
wrote:<br clear="none">
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Hi Drod,<br clear="none">
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Assuming your application is a C node, and that the library
codebase is the same as for NIFs and whatnot, I'd expect that
allocating structures / copying data is the appropriate behaviour
when creating Erlang terms -- it's the simple way to transfer that
data back to Erlang avoiding ownership issues and mutable state
(or at least making it much harder to unintentionally do it.)<br clear="none">
<br clear="none">
I've only dealt with NIFs though, and am not an expert on them, so
probably someone else can probably clarify this better.<br clear="none">
<br clear="none">
<br clear="none">
Cheers,<br clear="none">
<br clear="none">
<div class="yiv8655810684moz-cite-prefix">On 08/09/14 10:08, Dror Mein wrote:<br clear="none">
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<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);">
<div>Hi all,</div>
<div>I'm writing a c application that communicates with an
erlang node. In order to send messages to the node I need to
create erlang terms (ETERM structure).</div>
<div>it appears that all functions in the C library
"erl_eterm" allocate memory when creating erlang terms. </div>
<div>For example, erl_mk_binary copies the binary provided to
it, instead of only creating the pointer.</div>
<div>I want to prevent this memory allocation to optimize
speed. </div>
<div>Has anyone done this before? </div>
<div>Is there a better way to create eterms?</div>
<div><br clear="none">
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<div style="color: rgb(0, 0, 0); font-size: 16px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;">Thanks</div>
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Guilherme
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Guilherme
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