diff options
Diffstat (limited to 'lib/stdlib/doc/src')
| -rw-r--r-- | lib/stdlib/doc/src/supervisor.xml | 44 |
1 files changed, 40 insertions, 4 deletions
diff --git a/lib/stdlib/doc/src/supervisor.xml b/lib/stdlib/doc/src/supervisor.xml index adf9d24eae..c696434d49 100644 --- a/lib/stdlib/doc/src/supervisor.xml +++ b/lib/stdlib/doc/src/supervisor.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2009</year> + <year>1996</year><year>2010</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -13,12 +13,12 @@ compliance with the License. You should have received a copy of the Erlang Public License along with this software. If not, it can be retrieved online at http://www.erlang.org/. - + Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License. - + </legalnotice> <title>supervisor</title> @@ -402,9 +402,12 @@ child_spec() = {Id,StartFunc,Restart,Shutdown,Type,Modules} <v> Module = atom()</v> </type> <desc> - <p>Returns a list with information about all child + <p>Returns a newly created list with information about all child specifications and child processes belonging to the supervisor <c>SupRef</c>.</p> + <p>Note that calling this function when supervising a large + number of children under low memory conditions can cause an + out of memory exception.</p> <p>See <c>start_child/2</c> for a description of <c>SupRef</c>.</p> <p>The information given for each child specification/process is:</p> @@ -428,6 +431,39 @@ child_spec() = {Id,StartFunc,Restart,Shutdown,Type,Modules} </desc> </func> <func> + <name>count_children(SupRef) -> PropListOfCounts</name> + <fsummary>Return counts for the number of childspecs, active children, supervisors and workers.</fsummary> + <type> + <v>SupRef = Name | {Name,Node} | {global,Name} | pid()</v> + <v> Name = Node = atom()</v> + <v>PropListOfCounts = [{specs, ChildSpecCount}, {active, ActiveProcessCount}, {supervisors, ChildSupervisorCount}, {workers, ChildWorkerCount}]</v> + </type> + <desc> + <p>Returns a property list (see <c>proplists</c>) containing the + counts for each of the following elements of the supervisor's + child specifications and managed processes:</p> + <list type="bulleted"> + <item> + <p><c>specs</c> - the total count of children, dead or alive.</p> + </item> + <item> + <p><c>active</c> - the count of all actively running child processes + managed by this supervisor.</p> + </item> + <item> + <p><c>supervisors</c> - the count of all children marked as + child_type = supervisor in the spec list, whether or not the + child process is still alive.</p> + </item> + <item> + <p><c>workers</c> - the count of all children marked as + child_type = worker in the spec list, whether or not the child + process is still alive.</p> + </item> + </list> + </desc> + </func> + <func> <name>check_childspecs([ChildSpec]) -> Result</name> <fsummary>Check if children specifications are syntactically correct.</fsummary> <type> |