From c68c0fb64cd7309896d11f2b0806cddd56512e5c Mon Sep 17 00:00:00 2001
From: Thiago Macieira <thiago.macieira@intel.com>
Date: Wed, 23 Oct 2024 07:55:39 -0700
Subject: [PATCH] QWaitCondition/Unix: fix execution with negative deadlines
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pthread_cond_timedwait() doesn't like it.

Change-Id: I37ae26948fbc72fd1028fffd107e561cc54c4553
Reviewed-by: Ahmad Samir <a.samirh78@gmail.com>
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
(cherry picked from commit d60472c2c436fc464d5a1b81538967676f71b6a0)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 src/corelib/thread/qwaitcondition_unix.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/corelib/thread/qwaitcondition_unix.cpp b/src/corelib/thread/qwaitcondition_unix.cpp
index d841183f09e..123c9ad6389 100644
--- a/src/corelib/thread/qwaitcondition_unix.cpp
+++ b/src/corelib/thread/qwaitcondition_unix.cpp
@@ -74,7 +74,10 @@ static void qt_abstime_for_timeout(timespec *ts, QDeadlineTimer deadline)
     using Clock =
         std::conditional_t<SteadyClockClockId == CLOCK_REALTIME, system_clock, steady_clock>;
     auto timePoint = deadline.deadline<Clock>();
-    *ts = durationToTimespec(timePoint.time_since_epoch());
+    if (timePoint < Clock::time_point{})
+        *ts = {};
+    else
+        *ts = durationToTimespec(timePoint.time_since_epoch());
 }
 
 class QWaitConditionPrivate