From d312856e0cb89be73f16e328858eb5ab04aeec02 Mon Sep 17 00:00:00 2001
From: Martin Ridgers <martin.ridgers@epicgames.com>
Date: Thu, 11 Nov 2021 12:53:05 +0100
Subject: NamedEvent is no longer an Event-type object.

Platforms other than Windows do not really have a named event-like
primitive or ones that are close are fallible if a process
hard-terminates. Separating from Event more clearly conveys the use of
NamedEvent objects; to synchronise two processes.
---
 zencore/thread.cpp | 41 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

(limited to 'zencore/thread.cpp')

diff --git a/zencore/thread.cpp b/zencore/thread.cpp
index 3e40b6336..6c5419494 100644
--- a/zencore/thread.cpp
+++ b/zencore/thread.cpp
@@ -228,7 +228,7 @@ Event::Wait(int TimeoutMs)
 
 #if ZEN_PLATFORM_WINDOWS
 
-NamedEvent::NamedEvent(std::u8string_view EventName) : Event(nullptr)
+NamedEvent::NamedEvent(std::u8string_view EventName)
 {
 	using namespace std::literals;
 
@@ -239,7 +239,7 @@ NamedEvent::NamedEvent(std::u8string_view EventName) : Event(nullptr)
 	m_EventHandle = CreateEventA(nullptr, true, false, Name.c_str());
 }
 
-NamedEvent::NamedEvent(std::string_view EventName) : Event(nullptr)
+NamedEvent::NamedEvent(std::string_view EventName)
 {
 	using namespace std::literals;
 
@@ -250,6 +250,43 @@ NamedEvent::NamedEvent(std::string_view EventName) : Event(nullptr)
 	m_EventHandle = CreateEventA(nullptr, true, false, Name.c_str());
 }
 
+NamedEvent::~NamedEvent()
+{
+	Close();
+}
+
+void NamedEvent::Close()
+{
+	if (m_EventHandle == nullptr)
+	{
+		return;
+	}
+
+	CloseHandle(m_EventHandle);
+
+	m_EventHandle = nullptr;
+}
+
+void NamedEvent::Set()
+{
+	SetEvent(m_EventHandle);
+}
+
+bool NamedEvent::Wait(int TimeoutMs)
+{
+	const DWORD Timeout = (TimeoutMs < 0) ? INFINITE : TimeoutMs;
+
+	DWORD Result = WaitForSingleObject(m_EventHandle, Timeout);
+
+	if (Result == WAIT_FAILED)
+	{
+		using namespace std::literals;
+		zen::ThrowLastError("Event wait failed"sv);
+	}
+
+	return (Result == WAIT_OBJECT_0);
+}
+
 #endif // ZEN_PLATFORM_WINDOWS
 
 //////////////////////////////////////////////////////////////////////////
-- 
cgit v1.2.3