[PATCH] ipc: support _SC_NPROCESSORS_ONLN on OpenBSD

[Eric Wong]

Tested on both amd64 and i386, and these constants tend to be
architecture-independent.
---
 lib/PublicInbox/IPC.pm | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/PublicInbox/IPC.pm b/lib/PublicInbox/IPC.pm
index c154724e..84765748 100644
--- a/lib/PublicInbox/IPC.pm
+++ b/lib/PublicInbox/IPC.pm
@@ -455,6 +455,7 @@ sub detect_nproc () {
        # _SC_NPROCESSORS_ONLN = 84 on both Linux glibc and musl
        return POSIX::sysconf(84) if $^O eq 'linux';
        return POSIX::sysconf(58) if $^O eq 'freebsd';
+       return POSIX::sysconf(503) if $^O eq 'openbsd';
        # TODO: more OSes
 
        # getconf(1) is POSIX, but *NPROCESSORS* vars are not