libpthread/nptl: core of the "Native Posix Threading Library" for uClibc

targetting arm,sh,i386,mips,sparc for now

Signed-off-by: Austin Foxley <austinf@cetoncorp.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/libpthread/nptl/alloca_cutoff.c b/libpthread/nptl/alloca_cutoff.c
new file mode 100644
index 000000000..ba26ceba3
--- /dev/null
+++ b/libpthread/nptl/alloca_cutoff.c
@@ -0,0 +1,36 @@
+/* Determine whether block of given size can be allocated on the stack or not.
+   Copyright (C) 2002 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; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <alloca.h>
+#include <stdlib.h>
+#include <sys/param.h>
+#include <pthreadP.h>
+
+
+int
+__libc_alloca_cutoff (size_t size)
+{
+  return size <= (MIN (__MAX_ALLOCA_CUTOFF,
+		       THREAD_GETMEM (THREAD_SELF, stackblock_size) / 4
+		       /* The main thread, before the thread library is
+			  initialized, has zero in the stackblock_size
+			  element.  Since it is the main thread we can
+			  assume the maximum available stack space.  */
+		       ?: __MAX_ALLOCA_CUTOFF * 4));
+}