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authorSverker Eriksson <[email protected]>2014-09-03 17:13:22 +0200
committerSverker Eriksson <[email protected]>2014-09-03 17:13:22 +0200
commitb182aa2cfab793e566c92183c361e78f4d6f84cb (patch)
tree4821839fdc9c5ea0d8bdd81bd5b02785f0937ccc /system/doc/efficiency_guide
parentc472c3f5aafc81a409d0443c4601de43bafb53cb (diff)
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erts: Fix bug with enif_make_copy reallocating writable binary
that could invalidate a pointer received from an earlier call to enif_inspect_binary. Solution: Emasculate writable binary at enif_inspect_binary. There are room for optimizations here as we now do an unconditional emasculation even though enif_make_copy is not called later in the NIF.
Diffstat (limited to 'system/doc/efficiency_guide')
-rw-r--r--system/doc/efficiency_guide/binaryhandling.xml7
1 files changed, 4 insertions, 3 deletions
diff --git a/system/doc/efficiency_guide/binaryhandling.xml b/system/doc/efficiency_guide/binaryhandling.xml
index 6b0df49011..4ba1378059 100644
--- a/system/doc/efficiency_guide/binaryhandling.xml
+++ b/system/doc/efficiency_guide/binaryhandling.xml
@@ -5,7 +5,7 @@
<header>
<copyright>
<year>2007</year>
- <year>2013</year>
+ <year>2014</year>
<holder>Ericsson AB, All Rights Reserved</holder>
</copyright>
<legalnotice>
@@ -237,8 +237,9 @@ Bin = <<Bin1,...>> %% Bin1 will be COPIED
<p><c>Bin1</c> will be copied in the third line.</p>
<p>The same thing happens if you insert a binary into an <em>ets</em>
- table or send it to a port using <c>erlang:port_command/2</c>.</p>
-
+ table or send it to a port using <c>erlang:port_command/2</c> or pass it to
+ <seealso marker="erts:erl_nif#enif_inspect_binary">enif_inspect_binary</seealso>
+ in a NIF.</p>
<p>Matching a binary will also cause it to shrink and the next append
operation will copy the binary data:</p>