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| author | Richard Carlsson <[email protected]> | 2019-01-09 14:14:58 +0100 |
|---|---|---|
| committer | Richard Carlsson <[email protected]> | 2019-01-14 14:22:26 +0100 |
| commit | e96f66d8817d89c51b5066ed0cd69fcda8620306 (patch) | |
| tree | f63839cbcec202cef1da3126ce89443c3d208761 /erts | |
| parent | f0ea49125815ec9197ffb6c74e20ebb5f10732d4 (diff) | |
| download | otp-e96f66d8817d89c51b5066ed0cd69fcda8620306.tar.gz otp-e96f66d8817d89c51b5066ed0cd69fcda8620306.tar.bz2 otp-e96f66d8817d89c51b5066ed0cd69fcda8620306.zip | |
Document that current_function can be undefined
If a process is executing in native-compiled code, process_info(Pid,
current_function) may return the atom undefined instead of an MFA.
Diffstat (limited to 'erts')
| -rw-r--r-- | erts/doc/src/erlang.xml | 6 | ||||
| -rw-r--r-- | erts/preloaded/src/erlang.erl | 2 |
2 files changed, 5 insertions, 3 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml index 8e014c3010..ab9aadcc54 100644 --- a/erts/doc/src/erlang.xml +++ b/erts/doc/src/erlang.xml @@ -5182,11 +5182,13 @@ RealSystem = system + MissedSystem</code> changed or removed without prior notice.</p> </item> <tag><c>{current_function, {<anno>Module</anno>, - <anno>Function</anno>, Arity}}</c></tag> + <anno>Function</anno>, Arity} | undefined}</c></tag> <item> <p><c><anno>Module</anno></c>, <c><anno>Function</anno></c>, <c><anno>Arity</anno></c> is - the current function call of the process.</p> + the current function call of the process. The value + <c>undefined</c> can be returned if the process is + currently executing native compiled code.</p> </item> <tag><c>{current_location, {<anno>Module</anno>, <anno>Function</anno>, <anno>Arity</anno>, diff --git a/erts/preloaded/src/erlang.erl b/erts/preloaded/src/erlang.erl index 1ed6b6b284..59c96ceb3c 100644 --- a/erts/preloaded/src/erlang.erl +++ b/erts/preloaded/src/erlang.erl @@ -2295,7 +2295,7 @@ process_flag(_Flag, _Value) -> non_neg_integer()}]} | {catchlevel, CatchLevel :: non_neg_integer()} | {current_function, - {Module :: module(), Function :: atom(), Arity :: arity()}} | + {Module :: module(), Function :: atom(), Arity :: arity()} | undefined} | {current_location, {Module :: module(), Function :: atom(), Arity :: arity(), Location :: [{file, Filename :: string()} | % not a stack_item()! |