delete task only when it's not in running.

Ubiquitous/XiZi_AIoT/softkernel/include/multicores.h

@@ -50,4 +50,5 @@ static inline struct CPU* cur_cpu(void)
 struct spinlock whole_kernel_lock;
 
 void xizi_enter_kernel();
-void xizi_leave_kernel();
+void xizi_leave_kernel();
+bool xizi_is_in_kernel();

Ubiquitous/XiZi_AIoT/softkernel/include/syscall.h

@@ -93,4 +93,6 @@ int sys_state(sys_state_option option, sys_state_info* info);
 int sys_mmap(uintptr_t vaddr, uintptr_t paddr, int len, int is_dev);
 
 int sys_register_irq(int irq_num, int irq_opcode);
+int sys_unbind_irq_all(struct TaskMicroDescriptor* task);
+int sys_unbind_irq(struct TaskMicroDescriptor* task, int irq_num);
 #endif

Ubiquitous/XiZi_AIoT/softkernel/include/task.h

@@ -64,6 +64,8 @@ struct Thread {
 struct TaskMicroDescriptor {
     /* task debug resources */
     int pid;
+    bool bind_irq;
+    bool dead;
     char name[TASK_NAME_MAX_LEN];
 
     /// @todo support return value