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-rw-r--r--libpthread/nptl/alloca_cutoff.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/libpthread/nptl/alloca_cutoff.c b/libpthread/nptl/alloca_cutoff.c
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+++ b/libpthread/nptl/alloca_cutoff.c
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+/* 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));
+}