summaryrefslogtreecommitdiff
path: root/libpthread/nptl/sysdeps/pthread/pthread_once.c
diff options
context:
space:
mode:
Diffstat (limited to 'libpthread/nptl/sysdeps/pthread/pthread_once.c')
-rw-r--r--libpthread/nptl/sysdeps/pthread/pthread_once.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/pthread/pthread_once.c b/libpthread/nptl/sysdeps/pthread/pthread_once.c
new file mode 100644
index 000000000..57bb6b977
--- /dev/null
+++ b/libpthread/nptl/sysdeps/pthread/pthread_once.c
@@ -0,0 +1,54 @@
+/* Copyright (C) 2002, 2007 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+ The GNU C 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 2.1 of the License, or (at your option) any later version.
+
+ The GNU C 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 the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include "pthreadP.h"
+#include <lowlevellock.h>
+
+
+
+static int once_lock = LLL_LOCK_INITIALIZER;
+
+
+int
+__pthread_once (
+ pthread_once_t *once_control,
+ void (*init_routine) (void))
+{
+ /* XXX Depending on whether the LOCK_IN_ONCE_T is defined use a
+ global lock variable or one which is part of the pthread_once_t
+ object. */
+ if (*once_control == PTHREAD_ONCE_INIT)
+ {
+ lll_lock (once_lock, LLL_PRIVATE);
+
+ /* XXX This implementation is not complete. It doesn't take
+ cancelation and fork into account. */
+ if (*once_control == PTHREAD_ONCE_INIT)
+ {
+ init_routine ();
+
+ *once_control = !PTHREAD_ONCE_INIT;
+ }
+
+ lll_unlock (once_lock, LLL_PRIVATE);
+ }
+
+ return 0;
+}
+strong_alias (__pthread_once, pthread_once)