erts: Make trace_delivered go via sys msg dispatcher again

This is needed as otherwise messages from system_profile
will not be guaranteed to arrive before trace delivered.

1 files changed, 10 insertions, 3 deletions

diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index fde04504c8..423ccdf98f 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -8958,7 +8958,11 @@ timestamp() ->
       <name name="trace_delivered" arity="1"/>
       <fsummary>Notification when trace has been delivered.</fsummary>
       <desc>
-        <p>The delivery of trace messages is dislocated on the time-line
+        <p>The delivery of trace messages (generated by
+         <seealso marker="#trace/3"><c>erlang:trace/3</c></seealso>,
+         <seealso marker="kernel:seq_trace"><c>seq_trace</c></seealso> or
+         <seealso marker="#system_profile/2"><c>erlang:system_profile/2</c></seealso>)
+          is dislocated on the time-line
           compared to other events in the system. If you know that
           <c><anno>Tracee</anno></c> has passed some specific point
           in its execution,
@@ -8984,8 +8988,11 @@ timestamp() ->
           or previously existing on the same node as the caller of
           <c>erlang:trace_delivered(<anno>Tracee</anno>)</c> resides on.
           The special <c><anno>Tracee</anno></c> atom <c>all</c>
-          denotes all processes
-          that currently are traced in the node.</p>
+          denotes all processes that currently are traced in the node.</p>
+        <p>When used together with an <seealso marker="#erl_tracer">
+          Tracer Module</seealso> any message sent in the trace callback
+          is guaranteed to have reached it's recipient before the
+          <c>trace_delivered</c> message is sent.</p>
         <p>Example: Process <c>A</c> is <c><anno>Tracee</anno></c>,
 	  port <c>B</c> is tracer, and process <c>C</c> is the port
 	  owner of <c>B</c>. <c>C</c> wants to close <c>B</c> when