From 9747721a43cf95294b3c1c7632ef20859b3c4dee Mon Sep 17 00:00:00 2001
From: Augustin Cavalier <waddlesplash@gmail.com>
Date: Wed, 26 Apr 2023 17:12:24 -0400
Subject: [PATCH] kernel/condition_variable: Add a fast-exit from Wait() for
 negative timeouts.

acquire_sem_etc does something very similar.
---
 src/system/kernel/condition_variable.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/system/kernel/condition_variable.cpp b/src/system/kernel/condition_variable.cpp
index f504ae1545..019c07eb7d 100644
--- a/src/system/kernel/condition_variable.cpp
+++ b/src/system/kernel/condition_variable.cpp
@@ -214,6 +214,11 @@ ConditionVariableEntry::Wait(uint32 flags, bigtime_t timeout)
 	if (variable == NULL)
 		return fWaitStatus;
 
+	if ((flags & B_RELATIVE_TIMEOUT) != 0 && timeout <= 0) {
+		_RemoveFromVariable();
+		return B_WOULD_BLOCK;
+	}
+
 	InterruptsLocker _;
 	SpinLocker schedulerLocker(thread_get_current_thread()->scheduler_lock);