diff options
Diffstat (limited to 'pthreads/pthread_barrier_destroy.c')
| -rw-r--r-- | pthreads/pthread_barrier_destroy.c | 170 |
1 files changed, 103 insertions, 67 deletions
diff --git a/pthreads/pthread_barrier_destroy.c b/pthreads/pthread_barrier_destroy.c index 9302ba797..36472325d 100644 --- a/pthreads/pthread_barrier_destroy.c +++ b/pthreads/pthread_barrier_destroy.c @@ -1,67 +1,103 @@ -/* - * pthread_barrier_destroy.c - * - * Description: - * This translation unit implements barrier 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_barrier_destroy (pthread_barrier_t * barrier) -{ - int result = 0; - pthread_barrier_t b; - - if (barrier == NULL || *barrier == (pthread_barrier_t) PTW32_OBJECT_INVALID) - { - return EINVAL; - } - - b = *barrier; - *barrier = NULL; - - if (0 == (result = sem_destroy (&(b->semBarrierBreeched[0])))) - { - if (0 == (result = sem_destroy (&(b->semBarrierBreeched[1])))) - { - (void) free (b); - return 0; - } - (void) sem_init (&(b->semBarrierBreeched[0]), b->pshared, 0); - } - - *barrier = b; - return (result); -} +/*
+ * pthread_barrier_destroy.c
+ *
+ * Description:
+ * This translation unit implements barrier 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_barrier_destroy (pthread_barrier_t * barrier)
+{
+ int result = 0;
+ pthread_barrier_t b;
+ ptw32_mcs_local_node_t node;
+
+ if (barrier == NULL || *barrier == (pthread_barrier_t) PTW32_OBJECT_INVALID)
+ {
+ return EINVAL;
+ }
+
+ if (0 != ptw32_mcs_lock_try_acquire((ptw32_mcs_lock_t *)&(*barrier)->lock, &node))
+ {
+ return EBUSY;
+ }
+
+ b = *barrier;
+
+ if (b->nCurrentBarrierHeight < b->nInitialBarrierHeight)
+ {
+ result = EBUSY;
+ }
+ else
+ {
+ if (0 == (result = sem_destroy (&(b->semBarrierBreeched))))
+ {
+ *barrier = (pthread_barrier_t) PTW32_OBJECT_INVALID;
+ /*
+ * Release the lock before freeing b.
+ *
+ * FIXME: There may be successors which, when we release the lock,
+ * will be linked into b->lock, which will be corrupted at some
+ * point with undefined results for the application. To fix this
+ * will require changing pthread_barrier_t from a pointer to
+ * pthread_barrier_t_ to an instance. This is a change to the ABI
+ * and will require a major version number increment.
+ */
+ ptw32_mcs_lock_release(&node);
+ (void) free (b);
+ return 0;
+ }
+ else
+ {
+ /*
+ * This should not ever be reached.
+ * Restore the barrier to working condition before returning.
+ */
+ (void) sem_init (&(b->semBarrierBreeched), b->pshared, 0);
+ }
+
+ if (result != 0)
+ {
+ /*
+ * The barrier still exists and is valid
+ * in the event of any error above.
+ */
+ result = EBUSY;
+ }
+ }
+
+ ptw32_mcs_lock_release(&node);
+ return (result);
+}
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