zig

commit e496ef26dabb3a2da4821c7c0c2e4ffc6f7d86ce (tree)
parent edcf8e0636c5a2674ce2b3e568929232c8cc61eb
Author: LemonBoy <thatlemon@gmail.com>
Date:   Fri, 13 Mar 2020 18:40:18 +0100

Nicer idle wait loop

Trying to acquire twice the same mutex generates an idle loop.

Diffstat:
M
lib/std/debug.zig
 | 
7
+++++--

1 file changed, 5 insertions(+), 2 deletions(-)
diff --git 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 => {