From 64a1ea1aa97e5de174220f8de6815ede9fcfabac Mon Sep 17 00:00:00 2001
From: rpj <rpj>
Date: Mon, 8 Oct 2001 05:14:05 +0000
Subject: pthread_spin_trylock was not returning EBUSY on multi CPU machines.

---
 spin.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

(limited to 'spin.c')

diff --git a/spin.c b/spin.c
index 458bb7a..d2d795f 100644
--- a/spin.c
+++ b/spin.c
@@ -284,17 +284,13 @@ pthread_spin_trylock(pthread_spinlock_t *lock)
         }
     }
 
-  if ((_LONG) PTW32_SPIN_UNLOCKED ==
-      InterlockedCompareExchange((_LPLONG) &(s->interlock),
-                                 (_LONG) PTW32_SPIN_LOCKED,
-                                 (_LONG) PTW32_SPIN_UNLOCKED ) )
-    {
-      return 0;
-    }
-
-  if (s->interlock == PTW32_SPIN_USE_MUTEX)
+  switch ((long) InterlockedCompareExchange((_LPLONG) &(s->interlock),
+                                            (_LONG) PTW32_SPIN_LOCKED,
+                                            (_LONG) PTW32_SPIN_UNLOCKED ))
     {
-      return pthread_mutex_trylock(&(s->u.mutex));
+      case PTW32_SPIN_UNLOCKED:  return 0;
+      case PTW32_SPIN_LOCKED:    return EBUSY;
+      case PTW32_SPIN_USE_MUTEX: return pthread_mutex_trylock(&(s->u.mutex));
     }
 
   return EINVAL;
-- 
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