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diff --git a/pthread_spin_init.c b/pthread_spin_init.c
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+/*
+ * pthread_spin_init.c
+ *
+ * Description:
+ * This translation unit implements spin lock primitives.
+ *
+ * --------------------------------------------------------------------------
+ *
+ * Pthreads-win32 - POSIX Threads Library for Win32
+ * Copyright(C) 1998 John E. Bossom
+ * Copyright(C) 1999,2002 Pthreads-win32 contributors
+ *
+ * Contact Email: rpj@ise.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_init(pthread_spinlock_t *lock, int pshared)
+{
+ pthread_spinlock_t s;
+ int cpus = 0;
+ int result = 0;
+
+ if (lock == NULL)
+ {
+ return EINVAL;
+ }
+
+ if (0 != ptw32_getprocessors(&cpus))
+ {
+ cpus = 1;
+ }
+
+ if (cpus > 1)
+ {
+ if (pshared == PTHREAD_PROCESS_SHARED)
+ {
+ /*
+ * Creating spinlock that can be shared between
+ * processes.
+ */
+#if _POSIX_THREAD_PROCESS_SHARED
+
+ /*
+ * Not implemented yet.
+ */
+
+#error ERROR [__FILE__, line __LINE__]: Process shared spin locks are not supported yet.
+
+#else
+
+ return ENOSYS;
+
+#endif /* _POSIX_THREAD_PROCESS_SHARED */
+
+ }
+ }
+
+ s = (pthread_spinlock_t) calloc(1, sizeof(*s));
+
+ if (s == NULL)
+ {
+ return ENOMEM;
+ }
+
+ if (cpus > 1)
+ {
+ s->u.cpus = cpus;
+ s->interlock = PTW32_SPIN_UNLOCKED;
+ }
+ else
+ {
+ pthread_mutexattr_t ma;
+ result = pthread_mutexattr_init(&ma);
+
+ if (0 == result)
+ {
+ ma->pshared = pshared;
+ result = pthread_mutex_init(&(s->u.mutex), &ma);
+ if (0 == result)
+ {
+ s->interlock = PTW32_SPIN_USE_MUTEX;
+ }
+ }
+ (void) pthread_mutexattr_destroy(&ma);
+ }
+
+ if (0 == result)
+ {
+ *lock = s;
+ }
+ else
+ {
+ (void) free(s);
+ *lock = NULL;
+ }
+
+ return(result);
+}