diff options
Diffstat (limited to 'erts/doc/src/erlang.xml')
| -rw-r--r-- | erts/doc/src/erlang.xml | 51 |
1 files changed, 45 insertions, 6 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml index 0f4dfc0f98..37431cbf1b 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} @@ -5775,6 +5789,7 @@ ok <name name="system_info" arity="1" clause_i="52"/> <name name="system_info" arity="1" clause_i="53"/> <name name="system_info" arity="1" clause_i="54"/> + <name name="system_info" arity="1" clause_i="55"/> <fsummary>Information about the system</fsummary> <desc> <p>Returns various information about the current system @@ -5970,6 +5985,16 @@ ok The return value will always be <c>false</c> since the elib_malloc allocator has been removed.</p> </item> + <tag><marker id="system_info_eager_check_io"><c>eager_check_io</c></marker></tag> + <item> + <p> + Returns the value of the <c>erl</c> + <seealso marker="erl#+secio">+secio</seealso> command line + flag which is either <c>true</c> or <c>false</c>. See the + documentation of the command line flag for information about + the different values. + </p> + </item> <tag><c>ets_limit</c></tag> <item> <p>Returns the maximum number of ETS tables allowed. This limit @@ -6133,6 +6158,11 @@ ok <seealso marker="#system_info_multi_scheduling">erlang:system_info(multi_scheduling)</seealso>, and <seealso marker="#system_info_schedulers">erlang:system_info(schedulers)</seealso>.</p> </item> + <tag><c>nif_version</c></tag> + <item> + <p>Returns a string containing the erlang NIF version + used by the runtime system. It will be on the form "<major ver>.<minor ver>".</p> + </item> <tag><marker id="system_info_otp_release"><c>otp_release</c></marker></tag> <item> <p>Returns a string containing the OTP release number of the @@ -6295,6 +6325,13 @@ ok (<seealso marker="erts:erl_driver#driver_async">driver_async()</seealso>) as an integer.</p> </item> + <tag><marker id="system_info_tolerant_timeofday"><c>tolerant_timeofday</c></marker></tag> + <item> + <p>Returns whether compensation for sudden changes of system + time is <c>enabled</c> or <c>disabled</c>.</p> + <p>See also <seealso marker="erts:erl#+c">+c</seealso> + command line flag.</p> + </item> <tag><c>trace_control_word</c></tag> <item> <p>Returns the value of the node's trace control word. @@ -6792,7 +6829,9 @@ ok only allowed with <c>PidSpec==all</c>. If the host machine operating system does not support high resolution CPU time measurements, <c>trace/3</c> exits with - <c>badarg</c>.</p> + <c>badarg</c>. Note that most operating systems do + not synchronize this value across cores, so be prepared + that time might seem to go backwards when using this option.</p> </item> <tag><c>arity</c></tag> <item> |