From 50d2dd36c9a30460b32a4c9a3b4b2c456a255467 Mon Sep 17 00:00:00 2001
From: rpj <rpj>
Date: Fri, 12 Oct 2001 08:24:52 +0000
Subject:         * spin.c (pthread_spin_unlock): Was not returning        
 EPERM if the spinlock was not locked, for multi CPU         machines.

---
 spin.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

(limited to 'spin.c')

diff --git a/spin.c b/spin.c
index d2d795f..6688219 100644
--- a/spin.c
+++ b/spin.c
@@ -253,17 +253,18 @@ pthread_spin_unlock(pthread_spinlock_t *lock)
 {
   register pthread_spinlock_t s = *lock;
 
-  if (s->interlock == PTW32_SPIN_USE_MUTEX)
+  if (s == PTHREAD_SPINLOCK_INITIALIZER)
     {
-      return pthread_mutex_unlock(&(s->u.mutex));
+      return EPERM;
     }
 
-  if ((_LONG) PTW32_SPIN_LOCKED ==
-      InterlockedCompareExchange((_LPLONG) &(s->interlock),
-                                 (_LONG) PTW32_SPIN_UNLOCKED,
-                                 (_LONG) PTW32_SPIN_LOCKED ) )
+  switch ((long) InterlockedCompareExchange((_LPLONG) &(s->interlock),
+                                            (_LONG) PTW32_SPIN_UNLOCKED,
+                                            (_LONG) PTW32_SPIN_LOCKED ))
     {
-      return 0;
+      case PTW32_SPIN_LOCKED:    return 0;
+      case PTW32_SPIN_UNLOCKED:  return EPERM;
+      case PTW32_SPIN_USE_MUTEX: return pthread_mutex_unlock(&(s->u.mutex));
     }
 
   return EINVAL;
-- 
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