From 4dba818c8345288c10fca92062446b8a3c34ee06 Mon Sep 17 00:00:00 2001
From: 4lDO2 <4lDO2@protonmail.com>
Date: Sun, 30 Jun 2024 16:39:18 +0200
Subject: [PATCH] Check pending unblocked signals before blocking.

This is not a perfect solution, since the kernel technically already has
all the information it needs to synchronize this between the kill()
invocation and the time WaitCondition::wait is called, but it should not
have any noticeable performance impact.
---
 src/sync/wait_condition.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/sync/wait_condition.rs b/src/sync/wait_condition.rs
index b6fb71b00e..bbb47fc3ed 100644
--- a/src/sync/wait_condition.rs
+++ b/src/sync/wait_condition.rs
@@ -48,6 +48,9 @@ impl WaitCondition {
 
             {
                 let mut context = context_lock.write();
+                if let Some((control, _, _)) = context.sigcontrol() && control.currently_pending_unblocked() != 0 {
+                    return false;
+                }
                 id = context.id;
                 context.block(reason);
             }