diff options
Diffstat (limited to 'pthreads/pthread_once.c')
| -rw-r--r-- | pthreads/pthread_once.c | 172 |
1 files changed, 86 insertions, 86 deletions
diff --git a/pthreads/pthread_once.c b/pthreads/pthread_once.c index 96d45f297..74add02c3 100644 --- a/pthreads/pthread_once.c +++ b/pthreads/pthread_once.c @@ -1,86 +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 */ +/*
+ * 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 initing 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 */
|