diff options
Diffstat (limited to 'erts/doc')
| -rw-r--r-- | erts/doc/src/erl.xml | 24 | ||||
| -rw-r--r-- | erts/doc/src/erl_tracer.xml | 358 | ||||
| -rw-r--r-- | erts/doc/src/erlang.xml | 16 |
3 files changed, 369 insertions, 29 deletions
diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml index e13470c83c..c499fc8081 100644 --- a/erts/doc/src/erl.xml +++ b/erts/doc/src/erl.xml @@ -632,6 +632,15 @@ <p>Sets the initial process dictionary size of processes to the size <c><![CDATA[Size]]></c>.</p> </item> + <tag><marker id="+hmqd"><c>+hmqd off_heap|on_heap|mixed</c></marker></tag> + <item><p> + Sets the default value for the process flag + <c>message_queue_data</c>. If <c>+hmqd</c> is not + passed, <c>mixed</c> will be the default. For more information, + see the documentation of + <seealso marker="erlang#process_flag_message_queue_data"><c>process_flag(message_queue_data, + MQD)</c></seealso>. + </p></item> <tag><c><![CDATA[+K true | false]]></c></tag> <item> <p>Enables or disables the kernel poll functionality if @@ -1361,21 +1370,6 @@ <seealso marker="kernel:error_logger#warning_map/0">error_logger(3)</seealso> for further information.</p> </item> - <tag><c><![CDATA[+xFlag Value]]></c></tag> - <item> - <p>Default process flag settings.</p> - <taglist> - <tag><marker id="+xmqd"><c>+xmqd off_heap|on_heap|mixed</c></marker></tag> - <item><p> - Sets the default value for the process flag - <c>message_queue_data</c>. If <c>+xmqd</c> is not - passed, <c>mixed</c> will be the default. For more information, - see the documentation of - <seealso marker="erlang#process_flag_message_queue_data"><c>process_flag(message_queue_data, - MQD)</c></seealso>. - </p></item> - </taglist> - </item> <tag><c><![CDATA[+zFlag Value]]></c></tag> <item> <p>Miscellaneous flags.</p> diff --git a/erts/doc/src/erl_tracer.xml b/erts/doc/src/erl_tracer.xml index 1e8e78b25f..2075b962d8 100644 --- a/erts/doc/src/erl_tracer.xml +++ b/erts/doc/src/erl_tracer.xml @@ -54,6 +54,14 @@ </description> <datatypes> + <datatype> <name name="trace_tag_send" /> </datatype> + <datatype> <name name="trace_tag_receive" /> </datatype> + <datatype> <name name="trace_tag_call" /> </datatype> + <datatype> <name name="trace_tag_procs" /> </datatype> + <datatype> <name name="trace_tag_ports" /> </datatype> + <datatype> <name name="trace_tag_running_procs" /> </datatype> + <datatype> <name name="trace_tag_running_ports" /> </datatype> + <datatype> <name name="trace_tag_gc" /> </datatype> <datatype> <name name="trace_tag" /> <desc> @@ -105,6 +113,29 @@ <title>CALLBACK FUNCTIONS</title> <p>The following functions should be exported from a <c>erl_tracer</c> callback module.</p> + <taglist> + <tag><seealso marker="#enabled"><c>Module:enabled/3</c></seealso></tag> + <item>Mandatory</item> + <tag><seealso marker="#trace"><c>Module:trace/6</c></seealso></tag> + <item>Mandatory</item> + <tag><seealso marker="#enabled_procs"><c>Module:enabled_procs/3</c></seealso></tag> + <item>Optional</item> + <tag><seealso marker="#trace_procs"><c>Module:trace_procs/6</c></seealso></tag> + <item>Optional</item> + <tag><seealso marker="#enabled_ports"><c>Module:enabled_ports/3</c></seealso></tag> + <item>Optional</item> + <tag><seealso marker="#trace_ports"><c>Module:trace_ports/6</c></seealso></tag> + <item>Optional</item> + <tag><seealso marker="#enabled_running_ports"><c>Module:enabled_running_ports/3</c></seealso></tag> + <item>Optional</item> + <tag><seealso marker="#trace_running_ports"><c>Module:trace_running_ports/6</c></seealso></tag> + <item>Optional</item> + <tag><seealso marker="#enabled_running_procs"><c>Module:enabled_running_procs/3</c></seealso></tag> + <item>Optional</item> + <tag><seealso marker="#trace_running_procs"><c>Module:trace_running_procs/6</c></seealso></tag> + <item>Optional</item> + </taglist> + </section> <marker id="enabled"></marker> <funcs> @@ -114,11 +145,11 @@ <type> <v>TraceTag = <seealso marker="#type-trace_tag">trace_tag()</seealso> | trace_status</v> <v>TracerState = term()</v> - <v>Tracee = <seealso marker="#type-trace_tag">tracee()</seealso></v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> <v>Result = trace | discard | remove</v> </type> <desc> - <p>This callback will be called whenever a trace point is triggered. It + <p>This callback will be called whenever a tracepoint is triggered. It allows the tracer to decide whether a trace should be generated or not. This check is made as early as possible in order to limit the amount of overhead associated with tracing. If <c>trace</c> is returned the @@ -132,7 +163,7 @@ to check if the tracer should still be active. It is called in multiple scenarios, but most significantly it is used when tracing is started using this tracer.</p> - <p>This function may be called multiple times per trace point, so it + <p>This function may be called multiple times per tracepoint, so it is important that it is both fast and side effect free.</p> </desc> </func> @@ -143,17 +174,17 @@ <type> <v>TraceTag = <seealso marker="#type-trace_tag">trace_tag()</seealso></v> <v>TracerState = term()</v> - <v>Tracee = <seealso marker="#type-trace_tag">tracee()</seealso></v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> <v>FirstTraceTerm = term()</v> <v>SecondTraceTerm = term() | undefined</v> <v>Opts = <seealso marker="#type-trace_opts">trace_opts()</seealso></v> <v>Result = ok</v> </type> <desc> - <p>This callback will be called when a trace point is triggered and + <p>This callback will be called when a tracepoint is triggered and the <seealso marker="#enabled">Module:enabled/3</seealso> callback returned <c>trace</c>. In it any side effects needed by - the tracer should be done. The trace point payload is located in + the tracer should be done. The tracepoint payload is located in the <c>FirstTraceTerm</c> and <c>SecondTraceTerm</c>. The content of the TraceTerms depends on which <c>TraceTag</c> has been triggered. The <c>FirstTraceTerm</c> and <c>SecondTraceTerm</c> correspond to the @@ -181,6 +212,319 @@ see the <seealso marker="kernel:seq_trace">seq_trace</seealso> manual.</p> </desc> </func> + + <marker id="enabled_procs"></marker> + <func> + <name>Module:enabled_procs(TraceTag, TracerState, Tracee) -> Result</name> + <fsummary>Check if a trace event should be generated.</fsummary> + <type> + <v>TraceTag = <seealso marker="#type-trace_tag_procs">trace_tag_procs()</seealso></v> + <v>TracerState = term()</v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> + <v>Result = trace | discard | remove</v> + </type> + <desc> + <p>This callback will be called whenever a tracepoint with trace flag + <seealso marker="erlang#trace-3"><c>procs</c></seealso> + is triggered.</p> + <p>If <c>enabled_procs/3</c> is not defined <c>enabled/3</c> will be called instead.</p> + </desc> + </func> + + <marker id="trace_procs"></marker> + <func> + <name>Module:trace_procs(TraceTag, TracerState, Tracee, FirstTraceTerm, SecondTraceTerm, Opts) -> Result</name> + <fsummary>Check if a trace event should be generated.</fsummary> + <type> + <v>TraceTag = <seealso marker="#type-trace_tag_procs">trace_tag()</seealso></v> + <v>TracerState = term()</v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> + <v>FirstTraceTerm = term()</v> + <v>SecondTraceTerm = term() | undefined</v> + <v>Opts = <seealso marker="#type-trace_opts">trace_opts()</seealso></v> + <v>Result = ok</v> + </type> + <desc> + <p>This callback will be called when a tracepoint is triggered and + the <seealso marker="#enabled_procs">Module:enabled_procs/3</seealso> + callback returned <c>trace</c>.</p> + <p>If <c>trace_procs/6</c> is not defined <c>trace/6</c> will be called instead.</p> + </desc> + </func> + + <marker id="enabled_ports"></marker> + <func> + <name>Module:enabled_ports(TraceTag, TracerState, Tracee) -> Result</name> + <fsummary>Check if a trace event should be generated.</fsummary> + <type> + <v>TraceTag = <seealso marker="#type-trace_tag_ports">trace_tag_ports()</seealso></v> + <v>TracerState = term()</v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> + <v>Result = trace | discard | remove</v> + </type> + <desc> + <p>This callback will be called whenever a tracepoint with trace flag + <seealso marker="erlang#trace-3"><c>ports</c></seealso> + is triggered.</p> + <p>If <c>enabled_ports/3</c> is not defined <c>enabled/3</c> will be called instead.</p> + </desc> + </func> + + <marker id="trace_ports"></marker> + <func> + <name>Module:trace_ports(TraceTag, TracerState, Tracee, FirstTraceTerm, SecondTraceTerm, Opts) -> Result</name> + <fsummary>Check if a trace event should be generated.</fsummary> + <type> + <v>TraceTag = <seealso marker="#type-trace_tag_ports">trace_tag()</seealso></v> + <v>TracerState = term()</v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> + <v>FirstTraceTerm = term()</v> + <v>SecondTraceTerm = term() | undefined</v> + <v>Opts = <seealso marker="#type-trace_opts">trace_opts()</seealso></v> + <v>Result = ok</v> + </type> + <desc> + <p>This callback will be called when a tracepoint is triggered and + the <seealso marker="#enabled_ports">Module:enabled_ports/3</seealso> + callback returned <c>trace</c>.</p> + <p>If <c>trace_ports/6</c> is not defined <c>trace/6</c> will be called instead.</p> + </desc> + </func> + + <marker id="enabled_running_procs"></marker> + <func> + <name>Module:enabled_running_procs(TraceTag, TracerState, Tracee) -> Result</name> + <fsummary>Check if a trace event should be generated.</fsummary> + <type> + <v>TraceTag = <seealso marker="#type-trace_tag_running_procs">trace_tag_running_procs()</seealso></v> + <v>TracerState = term()</v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> + <v>Result = trace | discard | remove</v> + </type> + <desc> + <p>This callback will be called whenever a tracepoint with trace flag + <seealso marker="erlang#trace-3"><c>running_procs | running</c></seealso> + is triggered.</p> + <p>If <c>enabled_running_procs/3</c> is not defined <c>enabled/3</c> will be called instead.</p> + </desc> + </func> + + <marker id="trace_running_procs"></marker> + <func> + <name>Module:trace_running_procs(TraceTag, TracerState, Tracee, FirstTraceTerm, SecondTraceTerm, Opts) -> Result</name> + <fsummary>Check if a trace event should be generated.</fsummary> + <type> + <v>TraceTag = <seealso marker="#type-trace_tag_running_procs">trace_tag_running_procs()</seealso></v> + <v>TracerState = term()</v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> + <v>FirstTraceTerm = term()</v> + <v>SecondTraceTerm = term() | undefined</v> + <v>Opts = <seealso marker="#type-trace_opts">trace_opts()</seealso></v> + <v>Result = ok</v> + </type> + <desc> + <p>This callback will be called when a tracepoint is triggered and + the <seealso marker="#enabled_running_procs">Module:enabled_running_procs/3</seealso> + callback returned <c>trace</c>.</p> + <p>If <c>trace_running_procs/6</c> is not defined <c>trace/6</c> will be called instead.</p> + </desc> + </func> + + <marker id="enabled_running_ports"></marker> + <func> + <name>Module:enabled_running_ports(TraceTag, TracerState, Tracee) -> Result</name> + <fsummary>Check if a trace event should be generated.</fsummary> + <type> + <v>TraceTag = <seealso marker="#type-trace_tag_running_ports">trace_tag_running_ports()</seealso></v> + <v>TracerState = term()</v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> + <v>Result = trace | discard | remove</v> + </type> + <desc> + <p>This callback will be called whenever a tracepoint with trace flag + <seealso marker="erlang#trace-3"><c>running_ports</c></seealso> + is triggered.</p> + <p>If <c>enabled_running_ports/3</c> is not defined <c>enabled/3</c> will be called instead.</p> + </desc> + </func> + + <marker id="trace_running_ports"></marker> + <func> + <name>Module:trace_running_ports(TraceTag, TracerState, Tracee, FirstTraceTerm, SecondTraceTerm, Opts) -> Result</name> + <fsummary>Check if a trace event should be generated.</fsummary> + <type> + <v>TraceTag = <seealso marker="#type-trace_tag_running_ports">trace_tag_running_ports()</seealso></v> + <v>TracerState = term()</v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> + <v>FirstTraceTerm = term()</v> + <v>SecondTraceTerm = term() | undefined</v> + <v>Opts = <seealso marker="#type-trace_opts">trace_opts()</seealso></v> + <v>Result = ok</v> + </type> + <desc> + <p>This callback will be called when a tracepoint is triggered and + the <seealso marker="#enabled_running_ports">Module:enabled_running_ports/3</seealso> + callback returned <c>trace</c>.</p> + <p>If <c>trace_running_ports/6</c> is not defined <c>trace/6</c> will be called instead.</p> + </desc> + </func> + + <marker id="enabled_call"></marker> + <func> + <name>Module:enabled_call(TraceTag, TracerState, Tracee) -> Result</name> + <fsummary>Check if a trace event should be generated.</fsummary> + <type> + <v>TraceTag = <seealso marker="#type-trace_tag_call">trace_tag_call()</seealso></v> + <v>TracerState = term()</v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> + <v>Result = trace | discard | remove</v> + </type> + <desc> + <p>This callback will be called whenever a tracepoint with trace flag + <seealso marker="erlang#trace-3"><c>call | return_to</c></seealso> + is triggered.</p> + <p>If <c>enabled_call/3</c> is not defined <c>enabled/3</c> will be called instead.</p> + </desc> + </func> + + <marker id="trace_call"></marker> + <func> + <name>Module:trace_call(TraceTag, TracerState, Tracee, FirstTraceTerm, SecondTraceTerm, Opts) -> Result</name> + <fsummary>Check if a trace event should be generated.</fsummary> + <type> + <v>TraceTag = <seealso marker="#type-trace_tag_call">trace_tag_call()</seealso></v> + <v>TracerState = term()</v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> + <v>FirstTraceTerm = term()</v> + <v>SecondTraceTerm = term() | undefined</v> + <v>Opts = <seealso marker="#type-trace_opts">trace_opts()</seealso></v> + <v>Result = ok</v> + </type> + <desc> + <p>This callback will be called when a tracepoint is triggered and + the <seealso marker="#enabled_call">Module:enabled_call/3</seealso> + callback returned <c>trace</c>.</p> + <p>If <c>trace_call/6</c> is not defined <c>trace/6</c> will be called instead.</p> + </desc> + </func> + + <marker id="enabled_send"></marker> + <func> + <name>Module:enabled_send(TraceTag, TracerState, Tracee) -> Result</name> + <fsummary>Check if a trace event should be generated.</fsummary> + <type> + <v>TraceTag = <seealso marker="#type-trace_tag_send">trace_tag_send()</seealso></v> + <v>TracerState = term()</v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> + <v>Result = trace | discard | remove</v> + </type> + <desc> + <p>This callback will be called whenever a tracepoint with trace flag + <seealso marker="erlang#trace-3"><c>send</c></seealso> + is triggered.</p> + <p>If <c>enabled_send/3</c> is not defined <c>enabled/3</c> will be called instead.</p> + </desc> + </func> + + <marker id="trace_send"></marker> + <func> + <name>Module:trace_send(TraceTag, TracerState, Tracee, FirstTraceTerm, SecondTraceTerm, Opts) -> Result</name> + <fsummary>Check if a trace event should be generated.</fsummary> + <type> + <v>TraceTag = <seealso marker="#type-trace_tag_send">trace_tag_send()</seealso></v> + <v>TracerState = term()</v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> + <v>FirstTraceTerm = term()</v> + <v>SecondTraceTerm = term() | undefined</v> + <v>Opts = <seealso marker="#type-trace_opts">trace_opts()</seealso></v> + <v>Result = ok</v> + </type> + <desc> + <p>This callback will be called when a tracepoint is triggered and + the <seealso marker="#enabled_send">Module:enabled_send/3</seealso> + callback returned <c>trace</c>.</p> + <p>If <c>trace_send/6</c> is not defined <c>trace/6</c> will be called instead.</p> + </desc> + </func> + + <marker id="enabled_receive"></marker> + <func> + <name>Module:enabled_receive(TraceTag, TracerState, Tracee) -> Result</name> + <fsummary>Check if a trace event should be generated.</fsummary> + <type> + <v>TraceTag = <seealso marker="#type-trace_tag_receive">trace_tag_receive()</seealso></v> + <v>TracerState = term()</v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> + <v>Result = trace | discard | remove</v> + </type> + <desc> + <p>This callback will be called whenever a tracepoint with trace flag + <seealso marker="erlang#trace-3"><c>'receive'</c></seealso> + is triggered.</p> + <p>If <c>enabled_receive/3</c> is not defined <c>enabled/3</c> will be called instead.</p> + </desc> + </func> + + <marker id="trace_receive"></marker> + <func> + <name>Module:trace_receive(TraceTag, TracerState, Tracee, FirstTraceTerm, SecondTraceTerm, Opts) -> Result</name> + <fsummary>Check if a trace event should be generated.</fsummary> + <type> + <v>TraceTag = <seealso marker="#type-trace_tag_receive">trace_tag_receive()</seealso></v> + <v>TracerState = term()</v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> + <v>FirstTraceTerm = term()</v> + <v>SecondTraceTerm = term() | undefined</v> + <v>Opts = <seealso marker="#type-trace_opts">trace_opts()</seealso></v> + <v>Result = ok</v> + </type> + <desc> + <p>This callback will be called when a tracepoint is triggered and + the <seealso marker="#enabled_receive">Module:enabled_receive/3</seealso> + callback returned <c>trace</c>.</p> + <p>If <c>trace_receive/6</c> is not defined <c>trace/6</c> will be called instead.</p> + </desc> + </func> + + <marker id="enabled_garbage_collection"></marker> + <func> + <name>Module:enabled_garbage_collection(TraceTag, TracerState, Tracee) -> Result</name> + <fsummary>Check if a trace event should be generated.</fsummary> + <type> + <v>TraceTag = <seealso marker="#type-trace_tag_gc">trace_tag_gc()</seealso></v> + <v>TracerState = term()</v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> + <v>Result = trace | discard | remove</v> + </type> + <desc> + <p>This callback will be called whenever a tracepoint with trace flag + <seealso marker="erlang#trace-3"><c>garbage_collection</c></seealso> + is triggered.</p> + <p>If <c>enabled_garbage_collection/3</c> is not defined <c>enabled/3</c> will be called instead.</p> + </desc> + </func> + + <marker id="trace_garbage_collection"></marker> + <func> + <name>Module:trace_garbage_collection(TraceTag, TracerState, Tracee, FirstTraceTerm, SecondTraceTerm, Opts) -> Result</name> + <fsummary>Check if a trace event should be generated.</fsummary> + <type> + <v>TraceTag = <seealso marker="#type-trace_tag_gc">trace_tag_gc()</seealso></v> + <v>TracerState = term()</v> + <v>Tracee = <seealso marker="#type-tracee">tracee()</seealso></v> + <v>FirstTraceTerm = term()</v> + <v>SecondTraceTerm = term() | undefined</v> + <v>Opts = <seealso marker="#type-trace_opts">trace_opts()</seealso></v> + <v>Result = ok</v> + </type> + <desc> + <p>This callback will be called when a tracepoint is triggered and + the <seealso marker="#enabled_garbage_collection">Module:enabled_garbage_collection/3</seealso> + callback returned <c>trace</c>.</p> + <p>If <c>trace_garbage_collection/6</c> is not defined <c>trace/6</c> will be called instead.</p> + </desc> + </func> + </funcs> <section> <marker id="example"></marker> @@ -282,7 +626,7 @@ static ERL_NIF_TERM enabled(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]) ErlNifPid to_pid; if (enif_get_local_pid(env, argv[1], &to_pid)) if (!enif_is_process_alive(env, &to_pid)) - /* tracer is dead so we should remove this trace point */ + /* tracer is dead so we should remove this tracepoint */ return enif_make_atom(env, "remove"); /* Only generate trace for when tracer != tracee */ diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml index 423ccdf98f..4b5a27751a 100644 --- a/erts/doc/src/erlang.xml +++ b/erts/doc/src/erlang.xml @@ -4371,7 +4371,7 @@ os_prompt% </pre> </taglist> <p> The default <c>message_queue_data</c> process flag is determined - by the <seealso marker="erl#+xmqd"><c>+xmqd</c></seealso> + by the <seealso marker="erl#+hmqd"><c>+hmqd</c></seealso> <c>erl</c> command line argument. </p> <p> @@ -4878,7 +4878,9 @@ os_prompt% </pre> <tag><c>{total_heap_size, <anno>Size</anno>}</c></tag> <item> <p><c><anno>Size</anno></c> is the total size, in words, of all heap - fragments of the process. This includes the process stack.</p> + fragments of the process. This includes the process stack and + any unreceived messages that are considered to be part of the + heap. </p> </item> <tag><c>{trace, <anno>InternalTraceFlags</anno>}</c></tag> <item> @@ -5709,7 +5711,7 @@ true</pre> flag. <c><anno>MQD</anno></c> should be either <c>off_heap</c>, <c>on_heap</c>, or <c>mixed</c>. The default <c>message_queue_data</c> process flag is determined by the - <seealso marker="erl#+xmqd"><c>+xmqd</c></seealso> <c>erl</c> + <seealso marker="erl#+hmqd"><c>+hmqd</c></seealso> <c>erl</c> command line argument. For more information, see the documentation of <seealso marker="#process_flag_message_queue_data"><c>process_flag(message_queue_data, @@ -7388,7 +7390,7 @@ ok <p>Returns the default value of the <c>message_queue_data</c> process flag which is either <c>off_heap</c>, <c>on_heap</c>, or <c>mixed</c>. This default is set by the <c>erl</c> command line argument - <seealso marker="erl#+xmqd"><c>+xmqd</c></seealso>. For more information on the + <seealso marker="erl#+hmqd"><c>+hmqd</c></seealso>. For more information on the <c>message_queue_data</c> process flag, see documentation of <seealso marker="#process_flag_message_queue_data"><c>process_flag(message_queue_data, MQD)</c></seealso>.</p> @@ -8637,8 +8639,8 @@ timestamp() -> <p>Specifies that a tracer module should be called instead of sending a trace message. The tracer module can then ignore or change the trace message. For more details - on how to write a tracer module see <seealso marker="erl_tracer"> - erl_tracer</seealso> + on how to write a tracer module see + <seealso marker="erts:erl_tracer"><c>erl_tracer</c></seealso> </p> </item> </taglist> @@ -8989,7 +8991,7 @@ timestamp() -> <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> - <p>When used together with an <seealso marker="#erl_tracer"> + <p>When used together with an <seealso marker="erts: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> |