fix: pipe 读取/写入阻塞时,无法kill进程的问题 (#889)

kernel/crates/wait_queue_macros/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "wait_queue_macros"
+version = "0.1.0"
+edition = "2021"
+authors = ["longjin <longjin@dragonos.org>"]
+
+[dependencies]

kernel/crates/wait_queue_macros/src/lib.rs

@@ -0,0 +1,60 @@
+#![no_std]
+
+/// Wait for a condition to become true.
+///
+/// This macro will wait for a condition to become true.
+///
+/// ## Parameters
+///
+/// - `$wq`: The wait queue to wait on.
+/// - `$condition`: The condition to wait for. (you can pass a function or a boolean expression)
+/// - `$cmd`: The command to execute while waiting.
+#[macro_export]
+macro_rules! wq_wait_event_interruptible {
+    ($wq:expr, $condition: expr, $cmd: expr) => {{
+        let mut retval = Ok(());
+        if !$condition {
+            retval = wait_queue_macros::_wq_wait_event_interruptible!($wq, $condition, $cmd);
+        }
+
+        retval
+    }};
+}
+
+#[macro_export]
+#[allow(clippy::crate_in_macro_def)]
+macro_rules! _wq_wait_event_interruptible {
+    ($wq:expr, $condition: expr, $cmd: expr) => {{
+        wait_queue_macros::__wq_wait_event!($wq, $condition, true, Ok(()), {
+            $cmd;
+            crate::sched::schedule(SchedMode::SM_NONE)
+        })
+    }};
+}
+
+#[macro_export]
+macro_rules! __wq_wait_event(
+    ($wq:expr, $condition: expr, $interruptible: expr, $ret: expr, $cmd:expr) => {{
+        let mut retval = $ret;
+        let mut exec_finish_wait = true;
+        loop {
+            let x = $wq.prepare_to_wait_event($interruptible);
+            if $condition {
+                break;
+            }
+
+            if $interruptible && !x.is_ok() {
+                retval = x;
+                exec_finish_wait = false;
+                break;
+            }
+
+            $cmd;
+        }
+        if exec_finish_wait {
+            $wq.finish_wait();
+        }
+
+        retval
+    }};
+);