From 3de1b6c9a98993e6735098f94a7d5214d5fbcfcf Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Mon, 27 Oct 2025 16:34:35 -0700
Subject: [PATCH] std.Io.Threaded: better clock lowering for BSDs

---
 lib/std/Io/Threaded.zig | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/std/Io/Threaded.zig b/lib/std/Io/Threaded.zig
index c3d1102fcc..dae9089e90 100644
--- a/lib/std/Io/Threaded.zig
+++ b/lib/std/Io/Threaded.zig
@@ -5009,7 +5009,12 @@ fn clockToPosix(clock: Io.Clock) posix.clockid_t {
             // On freebsd derivatives, use MONOTONIC_FAST as currently there's
             // no precision tradeoff.
             .freebsd, .dragonfly => posix.CLOCK.MONOTONIC_FAST,
-            else => posix.CLOCK.BOOTTIME,
+            // On linux, use BOOTTIME instead of MONOTONIC as it ticks while
+            // suspended.
+            .linux => posix.CLOCK.BOOTTIME,
+            // On other posix systems, MONOTONIC is generally the fastest and
+            // ticks while suspended.
+            else => posix.CLOCK.MONOTONIC,
         },
         .cpu_process => posix.CLOCK.PROCESS_CPUTIME_ID,
         .cpu_thread => posix.CLOCK.THREAD_CPUTIME_ID,