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authorSverker Eriksson <[email protected]>2019-03-08 17:00:11 +0100
committerSverker Eriksson <[email protected]>2019-03-11 15:40:52 +0100
commit881d88f6ff3e39a91a0cb5ff6bd2944b96fa6736 (patch)
treec085d5e46fb25580f1d96fa1ea31dfa2b9c4d515 /lib/stdlib/doc/src
parent3066a5bf51467d1f8f0b05cf7b7bab0ef6a17578 (diff)
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stdlib: Clarify docs for ets:info(_, safe_fixed)
It's about the *last* time the table went from unfixed to fixed, not the first time it ever did.
Diffstat (limited to 'lib/stdlib/doc/src')
-rw-r--r--lib/stdlib/doc/src/ets.xml16
1 files changed, 11 insertions, 5 deletions
diff --git a/lib/stdlib/doc/src/ets.xml b/lib/stdlib/doc/src/ets.xml
index d2ac6a75b1..2cb677785d 100644
--- a/lib/stdlib/doc/src/ets.xml
+++ b/lib/stdlib/doc/src/ets.xml
@@ -642,12 +642,11 @@ Error: fun containing local Erlang function calls
<p><marker id="info_2_safe_fixed_monotonic_time"/></p>
<p><c>Item=safe_fixed|safe_fixed_monotonic_time,
Value={FixationTime,Info}|false</c></p>
- <p>If the table has been fixed using
+ <p>If the table is fixed using
<seealso marker="#safe_fixtable/2">
<c>safe_fixtable/2</c></seealso>,
the call returns a tuple where <c>FixationTime</c> is the
- time when the table was first fixed by a process, which either
- is or is not one of the processes it is fixed by now.</p>
+ last time when the table changed from unfixed to fixed.</p>
<p>The format and value of <c>FixationTime</c> depends on
<c>Item</c>:</p>
<taglist>
@@ -679,8 +678,15 @@ Error: fun containing local Erlang function calls
table is fixed by now. <c>RefCount</c> is the value
of the reference counter and it keeps track of how many times
the table has been fixed by the process.</p>
- <p>If the table never has been fixed, the call returns
- <c>false</c>.</p>
+ <p>Table fixations are not limited to <seealso marker="#safe_fixtable/2">
+ <c>safe_fixtable/2</c></seealso>. Temporary fixations may also
+ be done by for example <seealso marker="#traversal">traversing
+ functions</seealso> like <c>select</c> and <c>match</c>. Such
+ table fixations are automatically released before the
+ corresponding functions returns, but they may be seen by a
+ concurrent call to
+ <c>ets:info(T,safe_fixed|safe_fixed_monotonic_time)</c>.</p>
+ <p>If the table is not fixed at all, the call returns <c>false</c>.</p>
</item>
<item>
<p><c>Item=stats, Value=tuple()</c></p>