samples: prod_consumer: don't reuse main stack for app_b

With demand paging, the main stack is not user mode capable
and it would fail k_thread_user_mode_enter() under
app_b_entry(). So create another thread and stack for app_b
as this stack can be used in user mode.

Signed-off-by: Daniel Leung <[email protected]>

Author: dcpleung

samples/userspace/prod_consumer/src/main.c

@@ -17,6 +17,7 @@
 #include "app_b.h"
 
 #define APP_A_STACKSIZE	2048
+#define APP_B_STACKSIZE	2048
 
 LOG_MODULE_REGISTER(app_main);
 
@@ -45,8 +46,13 @@ K_QUEUE_DEFINE(shared_queue_outgoing);
 struct k_thread app_a_thread;
 K_THREAD_STACK_DEFINE(app_a_stack, APP_A_STACKSIZE);
 
+struct k_thread app_b_thread;
+K_THREAD_STACK_DEFINE(app_b_stack, APP_B_STACKSIZE);
+
 void main(void)
 {
+	k_tid_t thread_a, thread_b;
+
 	LOG_INF("APP A partition: %p %zu", (void *)app_a_partition.start,
 		(size_t)app_a_partition.size);
 	LOG_INF("Shared partition: %p %zu", (void *)shared_partition.start,
@@ -58,10 +64,15 @@ void main(void)
 	sys_heap_init(&shared_pool, shared_pool_mem, HEAP_BYTES);
 
 	/* Spawn supervisor entry for application A */
-	k_thread_create(&app_a_thread, app_a_stack, APP_A_STACKSIZE,
-			app_a_entry, NULL, NULL, NULL,
-			-1, K_INHERIT_PERMS, K_NO_WAIT);
+	thread_a = k_thread_create(&app_a_thread, app_a_stack, APP_A_STACKSIZE,
+				   app_a_entry, NULL, NULL, NULL,
+				   -1, K_INHERIT_PERMS, K_NO_WAIT);
+
+	/* Spawn supervisor entry for application B */
+	thread_b = k_thread_create(&app_b_thread, app_b_stack, APP_A_STACKSIZE,
+				   app_b_entry, NULL, NULL, NULL,
+				   -1, K_INHERIT_PERMS, K_NO_WAIT);
 
-	/* Re-use main for app B supervisor mode setup */
-	app_b_entry(NULL, NULL, NULL);
+	k_thread_join(thread_a, K_FOREVER);
+	k_thread_join(thread_b, K_FOREVER);
 }