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-rw-r--r--pthreads/pthread_spin_destroy.c112
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diff --git a/pthreads/pthread_spin_destroy.c b/pthreads/pthread_spin_destroy.c
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+/*
+ * pthread_spin_destroy.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_destroy (pthread_spinlock_t * lock)
+{
+ register pthread_spinlock_t s;
+ int result = 0;
+
+ if (lock == NULL || *lock == NULL)
+ {
+ return EINVAL;
+ }
+
+ if ((s = *lock) != PTHREAD_SPINLOCK_INITIALIZER)
+ {
+ if (s->interlock == PTW32_SPIN_USE_MUTEX)
+ {
+ result = pthread_mutex_destroy (&(s->u.mutex));
+ }
+ else if ((PTW32_INTERLOCKED_LONG) PTW32_SPIN_UNLOCKED !=
+ PTW32_INTERLOCKED_COMPARE_EXCHANGE ((PTW32_INTERLOCKED_LPLONG)
+ & (s->interlock),
+ (PTW32_INTERLOCKED_LONG)
+ PTW32_OBJECT_INVALID,
+ (PTW32_INTERLOCKED_LONG)
+ PTW32_SPIN_UNLOCKED))
+ {
+ result = EINVAL;
+ }
+
+ if (0 == result)
+ {
+ /*
+ * We are relying on the application to ensure that all other threads
+ * have finished with the spinlock before destroying it.
+ */
+ *lock = NULL;
+ (void) free (s);
+ }
+ }
+ else
+ {
+ /*
+ * See notes in ptw32_spinlock_check_need_init() above also.
+ */
+ EnterCriticalSection (&ptw32_spinlock_test_init_lock);
+
+ /*
+ * Check again.
+ */
+ if (*lock == PTHREAD_SPINLOCK_INITIALIZER)
+ {
+ /*
+ * This is all we need to do to destroy a statically
+ * initialised spinlock that has not yet been used (initialised).
+ * If we get to here, another thread
+ * waiting to initialise this mutex will get an EINVAL.
+ */
+ *lock = NULL;
+ }
+ else
+ {
+ /*
+ * The spinlock has been initialised while we were waiting
+ * so assume it's in use.
+ */
+ result = EBUSY;
+ }
+
+ LeaveCriticalSection (&ptw32_spinlock_test_init_lock);
+ }
+
+ return (result);
+}