sched: task: implement task creation flags

include/kernel/syscall.h

@@ -42,6 +42,7 @@ extern kern_status_t sys_task_exit(int status);
 extern kern_status_t sys_task_self(kern_handle_t *out);
 extern kern_status_t sys_task_create(
 	kern_handle_t parent_handle,
+	task_flags_t flags,
 	const char *name,
 	size_t name_len,
 	kern_handle_t *out_task,

include/kernel/task.h

@@ -40,9 +40,10 @@ struct task {
 extern struct task *task_alloc(void);
 extern struct task *task_cast(struct object *obj);
 extern struct task *task_create(
+	struct task *parent,
+	task_flags_t flags,
 	const char *name,
-	size_t name_len,
+	size_t name_len);
-	struct handle_table *handles);
 static inline struct task *task_ref(struct task *task)
 {
 	return OBJECT_CAST(struct task, t_base, object_ref(&task->t_base));

init/main.c

@@ -108,7 +108,8 @@ void kernel_init(uintptr_t arg)
 	       bsp.bsp_trailer.bsp_exec_entry,
 	       bsp.bsp_vmo);
 
-	struct task *bootstrap_task = task_create("bootstrap", 9, NULL);
+	struct task *bootstrap_task
+		= task_create(NULL, TASK_F_DEFAULT, "bootstrap", 9);
 	tracek("created bootstrap task (pid=%u)", bootstrap_task->t_id);
 
 	status = bsp_launch_async(&bsp, bootstrap_task);

sched/task.c

@@ -172,10 +172,12 @@ struct task *task_alloc(void)
 }
 
 struct task *task_create(
+	struct task *parent,
+	task_flags_t task_flags,
 	const char *name,
-	size_t name_len,
+	size_t name_len)
-	struct handle_table *handles)
 {
+	kern_status_t status = KERN_OK;
 	struct task *task = task_alloc();
 	if (!task) {
 		return NULL;
@@ -194,13 +196,21 @@ struct task *task_create(
 		VM_USER_LIMIT,
 		&task->t_address_space);
 
-	if (!handles) {
+	if (task_flags & TASK_F_CLONE_ALL_HANDLES) {
-		handles = handle_table_create();
+		status = handle_table_duplicate(
+			parent->t_handles,
+			&task->t_handles);
+	} else {
+		task->t_handles = handle_table_create();
+	}
+
+	if (status != KERN_OK) {
+		object_unref(&task->t_base);
+		return NULL;
 	}
 
 	task->t_address_space->s_pmap = pmap;
 	task->t_state = TASK_RUNNING;
-	task->t_handles = handles;
 
 	if (name) {
 		name_len = MIN(name_len, sizeof task->t_name - 1);

syscall/task.c

@@ -53,6 +53,7 @@ kern_status_t sys_task_self(kern_handle_t *out)
 
 kern_status_t sys_task_create(
 	kern_handle_t parent_handle,
+	task_flags_t task_flags,
 	const char *name,
 	size_t name_len,
 	kern_handle_t *out_task,
@@ -124,7 +125,7 @@ kern_status_t sys_task_create(
 
 	task_unlock_irqrestore(self, flags);
 
-	struct task *child = task_create(name, name_len, NULL);
+	struct task *child = task_create(parent, task_flags, name, name_len);
 	if (!child) {
 		object_unref(parent_obj);
 
@@ -468,14 +469,6 @@ kern_status_t sys_task_duplicate(
 	unsigned long flags;
 	task_lock_irqsave(self, &flags);
 
-	struct handle_table *child_handle_table = NULL;
-	status = handle_table_duplicate(self->t_handles, &child_handle_table);
-	if (status != KERN_OK) {
-		task_unlock_irqrestore(self, flags);
-		put_current_task(self);
-		return status;
-	}
-
 	struct handle *child_handle_slot = NULL, *space_handle_slot = NULL;
 	kern_handle_t child_handle, space_handle;
 	status = handle_table_alloc_handle(
@@ -484,7 +477,6 @@ kern_status_t sys_task_duplicate(
 		&child_handle_slot,
 		&child_handle);
 	if (status != KERN_OK) {
-		handle_table_destroy(child_handle_table);
 		task_unlock_irqrestore(self, flags);
 		put_current_task(self);
 		return status;
@@ -496,7 +488,6 @@ kern_status_t sys_task_duplicate(
 		&space_handle_slot,
 		&space_handle);
 	if (status != KERN_OK) {
-		handle_table_destroy(child_handle_table);
 		handle_table_free_handle(self->t_handles, child_handle);
 		task_unlock_irqrestore(self, flags);
 		put_current_task(self);
@@ -504,11 +495,11 @@ kern_status_t sys_task_duplicate(
 	}
 
 	struct task *new_task = task_create(
+		self,
+		TASK_F_CLONE_ALL_HANDLES,
 		self->t_name,
-		strlen(self->t_name),
+		strlen(self->t_name));
-		child_handle_table);
 	if (!new_task) {
-		handle_table_destroy(child_handle_table);
 		put_current_task(self);
 		return KERN_NO_MEMORY;
 	}