event: No longer require event in spdk_subsystem_fini

Just use a function pointer and a context.

Change-Id: I2d41ed2572d892f3328aadf7f22d8696816bf4d1
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/446995
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>

include/spdk_internal/event.h

@@ -51,7 +51,7 @@ int spdk_reactors_init(void);
 void spdk_reactors_fini(void);
 
 void spdk_reactors_start(void);
-void spdk_reactors_stop(void *arg1, void *arg2);
+void spdk_reactors_stop(void *arg1);
 
 struct spdk_subsystem {
 	const char *name;
@@ -88,7 +88,7 @@ void spdk_add_subsystem(struct spdk_subsystem *subsystem);
 void spdk_add_subsystem_depend(struct spdk_subsystem_depend *depend);
 
 void spdk_subsystem_init(spdk_msg_fn cb_fn, void *cb_arg);
-void spdk_subsystem_fini(struct spdk_event *app_finish_event);
+void spdk_subsystem_fini(spdk_msg_fn cb_fn, void *cb_arg);
 void spdk_subsystem_init_next(int rc);
 void spdk_subsystem_fini_next(void);
 void spdk_subsystem_config(FILE *fp);

lib/event/app.c

@@ -703,12 +703,8 @@ spdk_app_fini(void)
 static void
 _spdk_app_stop(void *arg1, void *arg2)
 {
-	struct spdk_event *app_stop_event;
-
 	spdk_rpc_finish();
-
-	app_stop_event = spdk_event_allocate(spdk_env_get_current_core(), spdk_reactors_stop, NULL, NULL);
-	spdk_subsystem_fini(app_stop_event);
+	spdk_subsystem_fini(spdk_reactors_stop, NULL);
 }
 
 void

lib/event/reactor.c

@@ -338,7 +338,7 @@ spdk_reactors_start(void)
 }
 
 void
-spdk_reactors_stop(void *arg1, void *arg2)
+spdk_reactors_stop(void *arg1)
 {
 	g_reactor_state = SPDK_REACTOR_STATE_EXITING;
 }

lib/event/subsystem.c

@@ -46,8 +46,9 @@ static bool g_subsystems_initialized = false;
 static bool g_subsystems_init_interrupted = false;
 static spdk_msg_fn g_app_start_fn = NULL;
 static void *g_app_start_arg = NULL;
-static struct spdk_event *g_app_stop_event;
-static uint32_t g_fini_core;
+static spdk_msg_fn g_app_stop_fn = NULL;
+static void *g_app_stop_arg = NULL;
+static struct spdk_thread *g_fini_thread = NULL;
 
 void
 spdk_add_subsystem(struct spdk_subsystem *subsystem)
@@ -187,9 +188,9 @@ spdk_subsystem_init(spdk_msg_fn cb_fn, void *cb_arg)
 }
 
 static void
-_spdk_subsystem_fini_next(void *arg1, void *arg2)
+_spdk_subsystem_fini_next(void *arg1)
 {
-	assert(g_fini_core == spdk_env_get_current_core());
+	assert(g_fini_thread == spdk_get_thread());
 
 	if (!g_next_subsystem) {
 		/* If the initialized flag is false, then we've failed to initialize
@@ -214,28 +215,27 @@ _spdk_subsystem_fini_next(void *arg1, void *arg2)
 		g_next_subsystem = TAILQ_PREV(g_next_subsystem, spdk_subsystem_list, tailq);
 	}
 
-	spdk_event_call(g_app_stop_event);
+	g_app_stop_fn(g_app_stop_arg);
 	return;
 }
 
 void
 spdk_subsystem_fini_next(void)
 {
-	if (g_fini_core != spdk_env_get_current_core()) {
-		struct spdk_event *event;
-
-		event = spdk_event_allocate(g_fini_core, _spdk_subsystem_fini_next, NULL, NULL);
-		spdk_event_call(event);
+	if (g_fini_thread != spdk_get_thread()) {
+		spdk_thread_send_msg(g_fini_thread, _spdk_subsystem_fini_next, NULL);
 	} else {
-		_spdk_subsystem_fini_next(NULL, NULL);
+		_spdk_subsystem_fini_next(NULL);
 	}
 }
 
 void
-spdk_subsystem_fini(struct spdk_event *app_stop_event)
+spdk_subsystem_fini(spdk_msg_fn cb_fn, void *cb_arg)
 {
-	g_app_stop_event = app_stop_event;
-	g_fini_core = spdk_env_get_current_core();
+	g_app_stop_fn = cb_fn;
+	g_app_stop_arg = cb_arg;
+
+	g_fini_thread = spdk_get_thread();
 
 	spdk_subsystem_fini_next();
 }

test/unit/lib/event/subsystem.c/subsystem_ut.c

@@ -37,6 +37,7 @@
 
 #include "unit/lib/json_mock.c"
 #include "event/subsystem.c"
+#include "common/lib/test_env.c"
 
 static struct spdk_subsystem g_ut_subsystems[8];
 static struct spdk_subsystem_depend g_ut_subsystem_deps[8];