From b67171535879acf1ee66751d7ada33a99b27419e Mon Sep 17 00:00:00 2001
From: Christopher Faylor <me@cgf.cx>
Date: Sun, 6 Jul 2003 20:08:42 +0000
Subject: * syscalls.cc (gethostid): Set thread affinity so that results are
 predictable.

---
 winsup/cygwin/syscalls.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'winsup/cygwin/syscalls.cc')

diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index a22f4ee06..5ef18ce7e 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -2787,6 +2787,11 @@ long gethostid(void)
                        0x00290012};
 
   bool has_cpuid = false;
+  sigframe thisframe (mainthread);
+
+  DWORD opmask = SetThreadAffinityMask (GetCurrentThread (), 1);
+  if (!opmask)
+    debug_printf ("SetThreadAffinityMask to 1 failed, %E");
 
   if (!can_set_flag (0x00040000))
     debug_printf ("386 processor - no cpuid");
@@ -2870,6 +2875,9 @@ long gethostid(void)
   for (int i=0;i<13;i++)
         hostid ^= ((data[i] << (i << 2)) | (data[i] >> (32 - (i << 2))));
 
+  if (opmask && !SetThreadAffinityMask (GetCurrentThread (), opmask))
+    debug_printf ("SetThreadAffinityMask to %p failed, %E", opmask);
+
   debug_printf ("hostid: %08x", hostid);
 
   return hostid;
-- 
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