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76a50749 | 1 | /* Determine whether block of given size can be allocated on the stack or not. |
d614a753 | 2 | Copyright (C) 2002-2020 Free Software Foundation, Inc. |
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3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
28ddcea0 RM |
6 | modify it under the terms of the GNU Lesser General Public License as |
7 | published by the Free Software Foundation; either version 2.1 of the | |
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8 | License, or (at your option) any later version. |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
28ddcea0 | 13 | Lesser General Public License for more details. |
76a50749 | 14 | |
28ddcea0 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; see the file COPYING.LIB. If |
5a82c748 | 17 | not, see <https://www.gnu.org/licenses/>. */ |
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18 | |
19 | #include <alloca.h> | |
20 | #include <stdlib.h> | |
21 | #include <sys/param.h> | |
22 | #include <pthreadP.h> | |
23 | ||
24 | ||
25 | int | |
26 | __libc_alloca_cutoff (size_t size) | |
27 | { | |
28 | return size <= (MIN (__MAX_ALLOCA_CUTOFF, | |
29 | THREAD_GETMEM (THREAD_SELF, stackblock_size) / 4 | |
30 | /* The main thread, before the thread library is | |
31 | initialized, has zero in the stackblock_size | |
32 | element. Since it is the main thread we can | |
33 | assume the maximum available stack space. */ | |
34 | ?: __MAX_ALLOCA_CUTOFF * 4)); | |
35 | } | |
a85b5cb4 | 36 | libc_hidden_def (__libc_alloca_cutoff) |