erts: Fix bug when tracing in non-smp non-scheduler thread

2 files changed, 77 insertions, 3 deletions

diff --git a/erts/emulator/test/port_trace_SUITE.erl b/erts/emulator/test/port_trace_SUITE.erl
index bfdea0761b..5d9a75bcd3 100644
--- a/erts/emulator/test/port_trace_SUITE.erl
+++ b/erts/emulator/test/port_trace_SUITE.erl
@@ -31,7 +31,8 @@
          failure_atom/1, failure_posix/1,
          failure/1, output_term/1,
          driver_output_term/1,
-         send_term/1, driver_send_term/1]).
+         send_term/1, driver_send_term/1,
+         driver_remote_send_term/1]).
 
 -define(ECHO_DRV_NOOP, 0).
 -define(ECHO_DRV_OUTPUT, 1).
@@ -48,6 +49,7 @@
 -define(ECHO_DRV_SEND_TERM, 12).
 -define(ECHO_DRV_DRIVER_SEND_TERM, 13).
 -define(ECHO_DRV_SAVE_CALLER, 14).
+-define(ECHO_DRV_REMOTE_SEND_TERM, 15).
 
 suite() -> [{ct_hooks,[ts_install_cth]},
             {timetrap, {seconds, 30}}].
@@ -60,7 +62,8 @@ all() ->
      failure_atom, failure_posix,
      failure, output_term,
      driver_output_term,
-     send_term, driver_send_term].
+     send_term, driver_send_term,
+     driver_remote_send_term].
 
 init_per_suite(Config) ->
     Config.
@@ -75,6 +78,13 @@ end_per_group(_GroupName, Config) ->
     Config.
 
 
+init_per_testcase(driver_remote_send_term, Config) ->
+    case erlang:system_info(smp_support) of
+        false ->
+            {skip,"Only supported on smp systems"};
+        true ->
+            init_per_testcase(driver_remote_send_term_smp, Config)
+    end;
 init_per_testcase(Func, Config) when is_atom(Func), is_list(Config) ->
     erlang:trace(all, false, [all]),
     os:unsetenv("OUTPUTV"),
@@ -543,6 +553,34 @@ driver_send_term(_Config) ->
 
     ok.
 
+%% Test that driver_send_term from non-scheduler thread does not
+%% generate trace messages.
+driver_remote_send_term(_Config) ->
+
+    Flags = [send],
+    {Prt, S} = trace_and_open(Flags,[binary]),
+
+    erlang:port_command(Prt, <<?ECHO_DRV_REMOTE_SEND_TERM, 123456:32>>),
+    recv({echo, Prt, <<123456:32>>}),
+    [] = flush(),
+
+    Pid = spawn_link(
+            fun() ->
+                    erlang:port_command(Prt, <<?ECHO_DRV_SAVE_CALLER>>),
+                    S ! ok,
+                    receive M -> S ! M end
+            end),
+    recv(ok),
+    erlang:trace(Pid, true, ['receive']),
+
+    erlang:port_command(Prt, <<?ECHO_DRV_REMOTE_SEND_TERM, 123456:32>>),
+    recv({echo, Prt, <<123456:32>>}),
+    [{trace, Pid, 'receive', {echo, Prt, <<123456:32>>}}] = flush(),
+
+    close(Prt, Flags),
+
+    ok.
+
 %%%%%%%%%%%%%%%%%%%
 %% Helper functions
 %%%%%%%%%%%%%%%%%%%
@@ -598,7 +636,7 @@ f(From) ->
     end.
 
 recv(Msg) ->
-    receive Msg -> ok after 100 -> ct:fail({did_not_get_data,Msg,flush()}) end.
+    receive Msg -> ok after 1000 -> ct:fail({did_not_get_data,Msg,flush()}) end.
 
 load_drv(Config) ->
     Path = proplists:get_value(data_dir, Config),
diff --git a/erts/emulator/test/port_trace_SUITE_data/echo_drv.c b/erts/emulator/test/port_trace_SUITE_data/echo_drv.c
index b5ae9389b4..b545523192 100644
--- a/erts/emulator/test/port_trace_SUITE_data/echo_drv.c
+++ b/erts/emulator/test/port_trace_SUITE_data/echo_drv.c
@@ -14,6 +14,13 @@ typedef struct _erl_drv_data {
     ErlDrvTermData caller;
 } EchoDrvData;
 
+struct remote_send_term {
+    char *buf;
+    int len;
+    ErlDrvTermData port;
+    ErlDrvTermData caller;
+};
+
 #define ECHO_DRV_NOOP                 0
 #define ECHO_DRV_OUTPUT               1
 #define ECHO_DRV_OUTPUT2              2
@@ -29,6 +36,7 @@ typedef struct _erl_drv_data {
 #define ECHO_DRV_SEND_TERM           12
 #define ECHO_DRV_DRIVER_SEND_TERM    13
 #define ECHO_DRV_SAVE_CALLER         14
+#define ECHO_DRV_REMOTE_SEND_TERM    15
 
 
 /* -------------------------------------------------------------------------
@@ -78,6 +86,8 @@ static ErlDrvEntry echo_drv_entry = {
     NULL
 };
 
+static void send_term_thread(void *);
+
 /* -------------------------------------------------------------------------
 ** Entry functions
 **/
@@ -200,6 +210,18 @@ static void echo_drv_output(ErlDrvData drv_data, char *buf, ErlDrvSizeT len) {
         }
         break;
     }
+    case ECHO_DRV_REMOTE_SEND_TERM:
+    {
+        ErlDrvTid tid;
+        struct remote_send_term *t = malloc(sizeof(struct remote_send_term));
+        t->len = len-1;
+        t->buf = malloc(len-1);
+        t->port = driver_mk_port(port);
+        t->caller = data_p->caller;
+        memcpy(t->buf, buf+1, t->len);
+        erl_drv_thread_create("tmp_thread", &tid, send_term_thread, t, NULL);
+        break;
+    }
     case ECHO_DRV_SAVE_CALLER:
         data_p->caller = driver_caller(port);
         break;
@@ -239,3 +261,17 @@ static ErlDrvSSizeT echo_drv_call(ErlDrvData drv_data,
     memcpy(*rbuf, buf+command, len-command);
     return len-command;
 }
+
+static void send_term_thread(void *a)
+{
+    struct remote_send_term *t = (struct remote_send_term*)a;
+    ErlDrvTermData term[] = {
+            ERL_DRV_ATOM, driver_mk_atom("echo"),
+            ERL_DRV_PORT, t->port,
+            ERL_DRV_BUF2BINARY, (ErlDrvTermData)(t->buf),
+                                (ErlDrvTermData)(t->len),
+            ERL_DRV_TUPLE, 3};
+    erl_drv_send_term(t->port, t->caller,
+                      term, sizeof(term) / sizeof(ErlDrvTermData));
+    return;
+}