Support blocking task.

Ubiquitous/XiZi_AIoT/softkernel/syscall/sys_poll_session.c

@@ -55,6 +55,15 @@ int sys_poll_session(struct Session* userland_session_arr, int arr_capacity)
             return -1;
         }
         // update session_backend
+        // if current session is handled
+        if (server_session->head != userland_session_arr[i].head) {
+            struct TaskMicroDescriptor* client = SERVER_SESSION_BACKEND(server_session)->client;
+            if (client->state == BLOCKED) {
+                xizi_task_manager.task_unblock(client);
+            } else {
+                client->current_ipc_handled = true;
+            }
+        }
         server_session->head = userland_session_arr[i].head;
         server_session->tail = userland_session_arr[i].tail;
         doubleListDel(cur_node);

Ubiquitous/XiZi_AIoT/softkernel/syscall/sys_state.c

@@ -85,6 +85,14 @@ void show_tasks(void)
             LOG_PRINTF("  %d   %s  %d       %d\n", task->pid, task->name, task->priority, task->mem_size >> 10);
         }
     }
+
+    DOUBLE_LIST_FOR_EACH_ENTRY(task, &xizi_task_manager.task_blocked_list_head, node)
+    {
+        LOG_PRINTF("  BLOCK ");
+        _padding(task->name);
+        LOG_PRINTF("  %d   %s  %d       %d\n", task->pid, task->name, task->priority, task->mem_size >> 10);
+    }
+
     LOG_PRINTF("******************************************************\n");
     return;
 }

Ubiquitous/XiZi_AIoT/softkernel/syscall/sys_yield.c

@@ -35,6 +35,16 @@ Modification:
 
 int sys_yield(task_yield_reason reason)
 {
-    xizi_task_manager.task_yield_noschedule(cur_cpu()->task, false);
+    struct TaskMicroDescriptor* cur_task = cur_cpu()->task;
+    xizi_task_manager.task_yield_noschedule(cur_task, false);
+
+    // handle ipc block
+    if ((reason & SYS_TASK_YIELD_BLOCK_IPC) != 0) {
+        if (cur_task->current_ipc_handled) {
+            cur_task->current_ipc_handled = false;
+        } else {
+            xizi_task_manager.task_block(cur_task);
+        }
+    }
     return 0;
 }