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Introduce a syscall restart mechanism

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This commit is contained in:
Zejun Zhao
2024-12-16 08:34:32 +08:00
committed by Tate, Hongliang Tian
parent b70c4784ed
commit ced0023d6b
9 changed files with 45 additions and 15 deletions
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10
kernel/src/thread/task.rs
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@ -64,22 +64,26 @@ pub fn create_new_user_task(user_space: Arc<UserSpace>, thread_ref: Arc<Thread>)
loop {
let return_reason = user_mode.execute(has_kernel_event_fn);
let user_ctx = user_mode.context_mut();
let mut syscall_number = None;
// handle user event:
match return_reason {
ReturnReason::UserException => handle_exception(&ctx, user_ctx),
ReturnReason::UserSyscall => handle_syscall(&ctx, user_ctx),
ReturnReason::UserSyscall => {
syscall_number = Some(user_ctx.syscall_num());
handle_syscall(&ctx, user_ctx);
}
ReturnReason::KernelEvent => {}
};
if current_thread.is_exited() {
break;
}
handle_pending_signal(user_ctx, &ctx).unwrap();
handle_pending_signal(user_ctx, &ctx, syscall_number).unwrap();
// If current is suspended, wait for a signal to wake up self
while current_thread.is_stopped() {
Thread::yield_now();
debug!("{} is suspended.", current_posix_thread.tid());
handle_pending_signal(user_ctx, &ctx).unwrap();
handle_pending_signal(user_ctx, &ctx, None).unwrap();
}
if current_thread.is_exited() {
debug!("exit due to signal");