From 8543e7e6e92e0e15843f2ce0ea70513d421cd8ae Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Wed, 10 May 2017 20:38:32 +0200
Subject: erts: Test monitor resource destructor from thread

which is scheduled on non-smp VM.
---
 erts/emulator/test/nif_SUITE.erl              | 15 ++++++++++++++-
 erts/emulator/test/nif_SUITE_data/nif_SUITE.c | 25 +++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/erts/emulator/test/nif_SUITE.erl b/erts/emulator/test/nif_SUITE.erl
index 1eb58699b2..0ae8e02011 100644
--- a/erts/emulator/test/nif_SUITE.erl
+++ b/erts/emulator/test/nif_SUITE.erl
@@ -629,6 +629,15 @@ monitor_process_a(Config) ->
 monitor_process_b(Config) ->
     ensure_lib_loaded(Config),
 
+    monitor_process_b_do(false),
+    case erlang:system_info(threads) of
+        true ->  monitor_process_b_do(true);
+        false -> ok
+    end,
+    ok.
+
+
+monitor_process_b_do(FromThread) ->
     Pid = spawn_link(fun() ->
                              receive
                                  return -> ok
@@ -637,7 +646,10 @@ monitor_process_b(Config) ->
     R_ptr = alloc_monitor_resource_nif(),
     {0,_} = monitor_process_nif(R_ptr, Pid, true, self()),
     [R_ptr] = monitored_by(Pid),
-    ok = release_resource(R_ptr),
+    case FromThread of
+        false -> ok = release_resource(R_ptr);
+        true -> ok = release_resource_from_thread(R_ptr)
+    end,
     [] = flush(),
     {R_ptr, _, 1} = last_resource_dtor_call(),
     [] = monitored_by(Pid),
@@ -2789,6 +2801,7 @@ alloc_resource(_,_) -> ?nif_stub.
 make_resource(_) -> ?nif_stub.
 get_resource(_,_) -> ?nif_stub.
 release_resource(_) -> ?nif_stub.
+release_resource_from_thread(_) -> ?nif_stub.
 last_resource_dtor_call() -> ?nif_stub.
 make_new_resource(_,_) -> ?nif_stub.
 check_is(_,_,_,_,_,_,_,_,_,_,_) -> ?nif_stub.
diff --git a/erts/emulator/test/nif_SUITE_data/nif_SUITE.c b/erts/emulator/test/nif_SUITE_data/nif_SUITE.c
index 3747291e7e..4f0400c960 100644
--- a/erts/emulator/test/nif_SUITE_data/nif_SUITE.c
+++ b/erts/emulator/test/nif_SUITE_data/nif_SUITE.c
@@ -972,6 +972,30 @@ static ERL_NIF_TERM release_resource(ErlNifEnv* env, int argc, const ERL_NIF_TER
     return enif_make_atom(env,"ok");
 }
 
+static void* threaded_release_resource(void* resource)
+{
+    enif_release_resource(resource);
+}
+
+static ERL_NIF_TERM release_resource_from_thread(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+    void* resource;
+    ErlNifTid tid;
+    int err;
+
+    if (!get_pointer(env, argv[0], &resource)) {
+        return enif_make_badarg(env);
+    }
+    if (enif_thread_create("nif_SUITE:release_resource_from_thread", &tid,
+                           threaded_release_resource, resource, NULL) != 0) {
+        return enif_make_badarg(env);
+    }
+    err = enif_thread_join(tid, NULL);
+    assert(err == 0);
+    return atom_ok;
+}
+
+
 /*
  * argv[0] an atom
  * argv[1] a binary
@@ -2903,6 +2927,7 @@ static ErlNifFunc nif_funcs[] =
     {"make_resource", 1, make_resource},
     {"get_resource", 2, get_resource},
     {"release_resource", 1, release_resource},
+    {"release_resource_from_thread", 1, release_resource_from_thread},
     {"last_resource_dtor_call", 0, last_resource_dtor_call},
     {"make_new_resource", 2, make_new_resource},
     {"check_is", 11, check_is},
-- 
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