From e496ef26dabb3a2da4821c7c0c2e4ffc6f7d86ce Mon Sep 17 00:00:00 2001
From: LemonBoy <thatlemon@gmail.com>
Date: Fri, 13 Mar 2020 18:40:18 +0100
Subject: Nicer idle wait loop

Trying to acquire twice the same mutex generates an idle loop.
---
 lib/std/debug.zig | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'lib/std/debug.zig')

diff --git a/lib/std/debug.zig b/lib/std/debug.zig
index cdbba2367b..f2c736bbba 100644
--- a/lib/std/debug.zig
+++ b/lib/std/debug.zig
@@ -278,8 +278,11 @@ pub fn panicExtra(trace: ?*const builtin.StackTrace, first_trace_addr: ?usize, c
                 // Another thread is panicking, wait for the last one to finish
                 // and call abort()
 
-                // XXX: Find a nicer way to loop forever
-                while (true) {}
+                // Here we sleep forever without hammering the CPU by causing a
+                // deadlock
+                var deadlock = std.Mutex.init();
+                _ = deadlock.acquire();
+                _ = deadlock.acquire();
             }
         },
         1 => {
-- 
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