diff options
| author | Steve M. Robbins <smr@debian.org> | 2011-10-22 04:54:51 +0200 |
|---|---|---|
| committer | Steve M. Robbins <smr@debian.org> | 2011-10-22 04:54:51 +0200 |
| commit | dd657ad3f1428b026486db3ec36691df17ddf515 (patch) | |
| tree | 6ffb465595479fb5a76c1a6ea3ec992abaa8c1c1 /liblo/pthreads.2/pthread_once.c | |
Import nyquist_3.05.orig.tar.gz
[dgit import orig nyquist_3.05.orig.tar.gz]
Diffstat (limited to 'liblo/pthreads.2/pthread_once.c')
| -rw-r--r-- | liblo/pthreads.2/pthread_once.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/liblo/pthreads.2/pthread_once.c b/liblo/pthreads.2/pthread_once.c new file mode 100644 index 0000000..19e63b4 --- /dev/null +++ b/liblo/pthreads.2/pthread_once.c @@ -0,0 +1,86 @@ +/*
+ * pthread_once.c
+ *
+ * Description:
+ * This translation unit implements miscellaneous thread functions.
+ *
+ * --------------------------------------------------------------------------
+ *
+ * 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"
+
+
+static void PTW32_CDECL
+ptw32_once_on_init_cancel (void * arg)
+{
+ /* when the initting thread is cancelled we have to release the lock */
+ ptw32_mcs_local_node_t *node = (ptw32_mcs_local_node_t *)arg;
+ ptw32_mcs_lock_release(node);
+}
+
+int
+pthread_once (pthread_once_t * once_control, void (*init_routine) (void))
+{
+ if (once_control == NULL || init_routine == NULL)
+ {
+ return EINVAL;
+ }
+
+ if (!InterlockedExchangeAdd((LPLONG)&once_control->done, 0)) /* MBR fence */
+ {
+ ptw32_mcs_local_node_t node;
+
+ ptw32_mcs_lock_acquire((ptw32_mcs_lock_t *)&once_control->lock, &node);
+
+ if (!once_control->done)
+ {
+
+#ifdef _MSC_VER
+#pragma inline_depth(0)
+#endif
+
+ pthread_cleanup_push(ptw32_once_on_init_cancel, (void *)&node);
+ (*init_routine)();
+ pthread_cleanup_pop(0);
+
+#ifdef _MSC_VER
+#pragma inline_depth()
+#endif
+
+ once_control->done = PTW32_TRUE;
+ }
+
+ ptw32_mcs_lock_release(&node);
+ }
+
+ return 0;
+
+} /* pthread_once */
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