Paper/patches/server/0657-Execute-chunk-tasks-fairly-for-worlds-while-waiting-.patch
Spottedleaf 8c5b837e05 Rework async chunk api implementation
Firstly, the old methods all routed to the CompletableFuture method.
However, the CF method could not guarantee that if the caller
was off-main that the future would be "completed" on-main. Since
the callback methods used the CF one, this meant that the callback
methods did not guarantee that the callbacks were to be called on
the main thread.

Now, all methods route to getChunkAtAsync(x, z, gen, urgent, cb)
so that the methods with the callback are guaranteed to invoke
the callback on the main thread. The CF behavior remains unchanged;
it may still appear to complete on main if invoked off-main.

Secondly, remove the scheduleOnMain invocation in the async
chunk completion. This unnecessarily delays the callback
by 1 tick.

Thirdly, add getChunksAtAsync(minX, minZ, maxX, maxZ, ...) which
will load chunks within an area. This method is provided as a helper
as keeping all chunks loaded within an area can be complicated to
implement for plugins (due to the lacking ticket API), and is
already implemented internally anyways.

Fourthly, remove the ticket addition that occured with getChunkAt
and getChunkAtAsync. The ticket addition may delay the unloading
of the chunk unnecessarily. It also fixes a very rare timing bug
where the future/callback would be completed after the chunk
unloads.
2024-11-18 23:00:59 -08:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Tue, 28 Dec 2021 07:19:01 -0800
Subject: [PATCH] Execute chunk tasks fairly for worlds while waiting for next
tick
Currently, only the first world would have had tasks executed.
This might result in chunks loading far slower in the nether,
for example.
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 0db44e8205d795cbeca1d6411aca0da5edf40d21..606c63342dcfb88e5c5d34c2e841ec8fa12e38e7 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -1404,6 +1404,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
if (super.pollTask()) {
return true;
} else {
+ boolean ret = false; // Paper - force execution of all worlds, do not just bias the first
if (this.tickRateManager.isSprinting() || this.haveTime()) {
Iterator iterator = this.getAllLevels().iterator();
@@ -1411,12 +1412,12 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
ServerLevel worldserver = (ServerLevel) iterator.next();
if (worldserver.getChunkSource().pollTask()) {
- return true;
+ ret = true; // Paper - force execution of all worlds, do not just bias the first
}
}
}
- return false;
+ return ret; // Paper - force execution of all worlds, do not just bias the first
}
}