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authorSiri Hansen <[email protected]>2011-11-14 15:39:45 +0100
committerSiri Hansen <[email protected]>2011-11-16 12:15:30 +0100
commit978ccb1fc2de4abc2d0d6b89e664ea6d8da1c663 (patch)
tree92510e2ba07f4b52935a632c366328107e677d2d /lib/stdlib
parentc87b8781f82eb3b8b4c2e9651070391d82e6c0ec (diff)
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Improve documentation on supervisor restart strategy
Diffstat (limited to 'lib/stdlib')
-rw-r--r--lib/stdlib/doc/src/supervisor.xml61
1 files changed, 39 insertions, 22 deletions
diff --git a/lib/stdlib/doc/src/supervisor.xml b/lib/stdlib/doc/src/supervisor.xml
index 30514dfee9..cddb55e5c5 100644
--- a/lib/stdlib/doc/src/supervisor.xml
+++ b/lib/stdlib/doc/src/supervisor.xml
@@ -158,7 +158,7 @@ child_spec() = {Id,StartFunc,Restart,Shutdown,Type,Modules}
death causes the temporary process to be terminated) and a
<c>transient</c> child process should be restarted only if
it terminates abnormally, i.e. with another exit reason
- than <c>normal</c>.</p>
+ than <c>normal</c>, <c>shutdown</c> or <c>{shutdown,Term}</c>.</p>
</item>
<item>
<p><c>Shutdown</c> defines how a child process should be
@@ -355,14 +355,23 @@ child_spec() = {Id,StartFunc,Restart,Shutdown,Type,Modules}
<desc>
<p>Tells the supervisor <c><anno>SupRef</anno></c> to terminate the given
child.</p>
+
<p>If the supervisor is not <c>simple_one_for_one</c>,
- <c><anno>Id</anno></c> must be the child specification identifier. The
- process, if there is one, is terminated but the child
- specification is kept by the supervisor. The child process
- may later be restarted by the supervisor. The child process
- can also be restarted explicitly by calling
+ <c><anno>Id</anno></c> must be the child specification
+ identifier. The process, if there is one, is terminated and,
+ unless it is a temporary child, the child specification is
+ kept by the supervisor. The child process may later be
+ restarted by the supervisor. The child process can also be
+ restarted explicitly by calling
<c>restart_child/2</c>. Use <c>delete_child/2</c> to remove
the child specification.</p>
+
+ <p>If the child is temporary, the child specification is deleted as
+ soon as the process terminates. This means
+ that <c>delete_child/2</c> has no meaning
+ and <c>restart_child/2</c> can not be used for these
+ children.</p>
+
<p>If the supervisor is <c>simple_one_for_one</c>, <c><anno>Id</anno></c>
must be the child process' <c>pid()</c>. I the specified
process is alive, but is not a child of the given
@@ -399,26 +408,34 @@ child_spec() = {Id,StartFunc,Restart,Shutdown,Type,Modules}
<name name="restart_child" arity="2"/>
<fsummary>Restart a terminated child process belonging to a supervisor.</fsummary>
<desc>
- <p>Tells the supervisor <c><anno>SupRef</anno></c> to restart a child process
- corresponding to the child specification identified by
- <c><anno>Id</anno></c>. The child specification must exist and
- the corresponding child process must not be running.</p>
- <p>See <seealso marker="#SupRef"><c>start_child/2</c></seealso> for a description of
- <c>SupRef</c>.</p>
- <p>If the child specification identified by <c><anno>Id</anno></c> does not
- exist, the function returns <c>{error,not_found}</c>. If
- the child specification exists but the corresponding process
- is already running, the function returns
+ <p>Tells the supervisor <c><anno>SupRef</anno></c> to restart
+ a child process corresponding to the child specification
+ identified by <c><anno>Id</anno></c>. The child
+ specification must exist and the corresponding child process
+ must not be running.</p>
+ <p>Note that for temporary children, the child specification
+ is automatically deleted when the child terminates, and thus
+ it is not possible to restart such children.</p>
+ <p>See <seealso marker="#SupRef"><c>start_child/2</c></seealso>
+ for a description of <c>SupRef</c>.</p>
+ <p>If the child specification identified
+ by <c><anno>Id</anno></c> does not exist, the function
+ returns <c>{error,not_found}</c>. If the child specification
+ exists but the corresponding process is already running, the
+ function returns
<c>{error,running}</c>.</p>
- <p>If the child process start function returns <c>{ok,<anno>Child</anno>}</c>
- or <c>{ok,<anno>Child</anno>,<anno>Info</anno>}</c>, the pid is added to the supervisor
- and the function returns the same value.</p>
+ <p>If the child process start function
+ returns <c>{ok,<anno>Child</anno>}</c>
+ or <c>{ok,<anno>Child</anno>,<anno>Info</anno>}</c>, the pid
+ is added to the supervisor and the function returns the same
+ value.</p>
<p>If the child process start function returns <c>ignore</c>,
the pid remains set to <c>undefined</c> and the function
returns <c>{ok,undefined}</c>.</p>
- <p>If the child process start function returns an error tuple or
- an erroneous value, or if it fails, the function returns
- <c>{error,<anno>Error</anno>}</c> where <c><anno>Error</anno></c> is a term containing
+ <p>If the child process start function returns an error tuple
+ or an erroneous value, or if it fails, the function returns
+ <c>{error,<anno>Error</anno>}</c>
+ where <c><anno>Error</anno></c> is a term containing
information about the error.</p>
</desc>
</func>