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-rw-r--r--erts/doc/src/erlang.xml24
1 files changed, 19 insertions, 5 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index 9ad42374bf..97fe6d2915 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -1252,10 +1252,11 @@ true
<fsummary>Check if a function is exported and loaded</fsummary>
<desc>
<p>Returns <c>true</c> if the module <c><anno>Module</anno></c> is loaded
- and contains an exported function <c><anno>Function</anno>/<anno>Arity</anno></c>;
- otherwise <c>false</c>.</p>
- <p>Returns <c>false</c> for any BIF (functions implemented in C
- rather than in Erlang).</p>
+ and contains an exported function <c><anno>Function</anno>/<anno>Arity</anno></c>,
+ or if there is a BIF (a built-in function implemented in C)
+ with the given name; otherwise returns <c>false</c>.</p>
+ <note><p>This function used to return false for built-in
+ functions before the 18.0 release.</p></note>
</desc>
</func>
<func>
@@ -1376,6 +1377,19 @@ true
</desc>
</func>
<func>
+ <name name="get_keys" arity="0"/>
+ <fsummary>Return a list of all keys from the process dictionary</fsummary>
+ <desc>
+ <p>Returns a list of keys all keys present in the process dictionary.</p>
+ <pre>
+> <input>put(dog, {animal,1}),</input>
+<input>put(cow, {animal,2}),</input>
+<input>put(lamb, {animal,3}),</input>
+<input>get_keys().</input>
+[dog,cow,lamb]</pre>
+ </desc>
+ </func>
+ <func>
<name name="get_keys" arity="1"/>
<fsummary>Return a list of keys from the process dictionary</fsummary>
<desc>
@@ -4968,7 +4982,7 @@ true</pre>
<desc>
<p>Note that the run-time is the sum of the run-time for all
threads in the Erlang run-time system and may therefore be greater
- than the wall-clock time.</p>
+ than the wall-clock time. The time is returned in milliseconds.</p>
<pre>
> <input>statistics(runtime).</input>
{1690,1620}