Reorganize the codebase

services/libs/jinux-std/src/syscall/pause.rs

@@ -0,0 +1,20 @@
+use crate::{prelude::*, process::posix_thread::posix_thread_ext::PosixThreadExt, thread::Thread};
+
+use super::SyscallReturn;
+
+pub fn sys_pause() -> Result<SyscallReturn> {
+    loop {
+        let current_thread = current_thread!();
+        // check sig_queue of current thread and process,
+        // if there's any pending signal, break loop
+        let posix_thread = current_thread.as_posix_thread().unwrap();
+        if !posix_thread.sig_queues().lock().empty() || !current!().sig_queues().lock().empty() {
+            break;
+        }
+        // there's no pending signal, yield execution
+        // FIXME: set current thread interruptible here
+        Thread::yield_now();
+    }
+    // handle signal before returning to user space
+    return_errno_with_message!(Errno::ERESTART, "catch signal")
+}