New API to set default thread attributes

This patch introduces two new convenience functions to set the default
thread attributes used for creating threads.  This allows a programmer
to set the default thread attributes just once in a process and then
run pthread_create without additional attributes.

1 files changed, 37 insertions, 0 deletions

diff --git a/nptl/pthread_getattr_default_np.c b/nptl/pthread_getattr_default_np.c
new file mode 100644
index 0000000000..f3a6b47464
--- /dev/null
+++ b/nptl/pthread_getattr_default_np.c
@@ -0,0 +1,37 @@
+/* Get the default attributes used by pthread_create in the process.
+   Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <pthreadP.h>
+#include <assert.h>
+
+int
+pthread_getattr_default_np (pthread_attr_t *out)
+{
+  struct pthread_attr *real_out;
+
+  assert (sizeof (*out) >= sizeof (struct pthread_attr));
+  real_out = (struct pthread_attr *) out;
+
+  lll_lock (__default_pthread_attr_lock, LLL_PRIVATE);
+  *real_out = __default_pthread_attr;
+  lll_unlock (__default_pthread_attr_lock, LLL_PRIVATE);
+
+  return 0;
+}