1 files changed, 77 insertions, 0 deletions
diff --git a/libs/pthreads/src/pthread_spin_trylock.c b/libs/pthreads/src/pthread_spin_trylock.c
new file mode 100644
index 0000000000..a6c65aff6a
--- /dev/null
+++ b/libs/pthreads/src/pthread_spin_trylock.c
@@ -0,0 +1,77 @@
+/*
+ * pthread_spin_trylock.c
+ *
+ * Description:
+ * This translation unit implements spin lock primitives.
+ *
+ * --------------------------------------------------------------------------
+ *
+ *      Pthreads-win32 - POSIX Threads Library for Win32
+ *      Copyright(C) 1998 John E. Bossom
+ *      Copyright(C) 1999,2005 Pthreads-win32 contributors
+ * 
+ *      Contact Email: rpj@callisto.canberra.edu.au
+ * 
+ *      The current list of contributors is contained
+ *      in the file CONTRIBUTORS included with the source
+ *      code distribution. The list can also be seen at the
+ *      following World Wide Web location:
+ *      http://sources.redhat.com/pthreads-win32/contributors.html
+ * 
+ *      This library is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU Lesser General Public
+ *      License as published by the Free Software Foundation; either
+ *      version 2 of the License, or (at your option) any later version.
+ * 
+ *      This library is distributed in the hope that it will be useful,
+ *      but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *      Lesser General Public License for more details.
+ * 
+ *      You should have received a copy of the GNU Lesser General Public
+ *      License along with this library in the file COPYING.LIB;
+ *      if not, write to the Free Software Foundation, Inc.,
+ *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include "pthread.h"
+#include "implement.h"
+
+
+int
+pthread_spin_trylock (pthread_spinlock_t * lock)
+{
+  register pthread_spinlock_t s;
+
+  if (NULL == lock || NULL == *lock)
+    {
+      return (EINVAL);
+    }
+
+  if (*lock == PTHREAD_SPINLOCK_INITIALIZER)
+    {
+      int result;
+
+      if ((result = ptw32_spinlock_check_need_init (lock)) != 0)
+	{
+	  return (result);
+	}
+    }
+
+  s = *lock;
+
+  switch ((long)
+	  PTW32_INTERLOCKED_COMPARE_EXCHANGE_LONG ((PTW32_INTERLOCKED_LONGPTR) &s->interlock,
+					           (PTW32_INTERLOCKED_LONG) PTW32_SPIN_LOCKED,
+					           (PTW32_INTERLOCKED_LONG) PTW32_SPIN_UNLOCKED))
+    {
+    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;
+}