From 5daa40454b63c4eb04ab5caeb339eddc95c94bb1 Mon Sep 17 00:00:00 2001
From: Lasse Collin <lasse.collin@tukaani.org>
Date: Thu, 20 Oct 2022 20:22:50 +0300
Subject: tuklib_cpucores: Use HW_NCPUONLINE on OpenBSD.

On OpenBSD the number of cores online is often less
than what HW_NCPU would return because OpenBSD disables
simultaneous multi-threading (SMT) by default.

Thanks to Christian Weisgerber.
---
 m4/tuklib_cpucores.m4 | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'm4/tuklib_cpucores.m4')

diff --git a/m4/tuklib_cpucores.m4 b/m4/tuklib_cpucores.m4
index a2b09a72..c5cee23e 100644
--- a/m4/tuklib_cpucores.m4
+++ b/m4/tuklib_cpucores.m4
@@ -103,7 +103,12 @@ compile error
 int
 main(void)
 {
+#ifdef HW_NCPUONLINE
+	/* This is preferred on OpenBSD, see tuklib_cpucores.c. */
+	int name[2] = { CTL_HW, HW_NCPUONLINE };
+#else
 	int name[2] = { CTL_HW, HW_NCPU };
+#endif
 	int cpus;
 	size_t cpus_size = sizeof(cpus);
 	sysctl(name, 2, &cpus, &cpus_size, NULL, 0);
-- 
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