From 5b801efdb39be1af3ec9a50dac0e3c6994bf8847 Mon Sep 17 00:00:00 2001
From: Martin Ridgers <martin.ridgers@epicgames.com>
Date: Fri, 7 Jan 2022 10:16:05 +0100
Subject: Use semtimedop() in NamedEvent::Wait() for platforms that support it

---
 zencore/thread.cpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'zencore/thread.cpp')

diff --git a/zencore/thread.cpp b/zencore/thread.cpp
index 063b060c9..f01cba7a8 100644
--- a/zencore/thread.cpp
+++ b/zencore/thread.cpp
@@ -8,6 +8,12 @@
 #include <zencore/string.h>
 #include <zencore/testing.h>
 
+#if ZEN_PLATFORM_LINUX
+#	if !defined(_GNU_SOURCE)
+#		define _GNU_SOURCE // for semtimedop()
+#	endif
+#endif
+
 #if ZEN_PLATFORM_WINDOWS
 #	include <shellapi.h>
 #	include <Shlobj.h>
@@ -459,6 +465,14 @@ NamedEvent::Wait(int TimeoutMs)
 		return Result == 0;
 	}
 
+#if defined(_GNU_SOURCE)
+	struct timespec TimeoutValue = {
+		.tv_sec	 = TimeoutMs >> 10,
+		.tv_nsec = (TimeoutMs & 0x3ff) << 20,
+	};
+	int Result = semtimedop(Sem, &SemOp, 1, &TimeoutValue);
+	return Result == 0;
+#else
 	const int SleepTimeMs = 10;
 	SemOp.sem_flg = IPC_NOWAIT;
 	do
@@ -475,6 +489,7 @@ NamedEvent::Wait(int TimeoutMs)
 	while (TimeoutMs > 0);
 
 	return Result == 0;
+#endif // _GNU_SOURCE
 #endif
 }
 
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