1 | /* Allocate a new stack. Mach version. |
2 | Copyright (C) 2000-2022 Free Software Foundation, Inc. |
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 |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the 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 |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <errno.h> |
20 | |
21 | #include <mach.h> |
22 | #include <mach/machine/vm_param.h> |
23 | |
24 | #include <pt-internal.h> |
25 | |
26 | /* The next address to use for stack allocation. */ |
27 | static vm_address_t next_stack_base = VM_MIN_ADDRESS; |
28 | |
29 | |
30 | /* Allocate a new stack of size STACKSIZE. If successful, store the |
31 | address of the newly allocated stack in *STACKADDR and return 0. |
32 | Otherwise return an error code (EINVAL for an invalid stack size, |
33 | EAGAIN if the system lacked the necessary resources to allocate a |
34 | new stack). */ |
35 | int |
36 | __pthread_stack_alloc (void **stackaddr, size_t stacksize) |
37 | { |
38 | vm_offset_t base; |
39 | int i = 0; |
40 | |
41 | get_stack: |
42 | i++; |
43 | for (base = next_stack_base; |
44 | base < VM_MAX_ADDRESS |
45 | && __vm_allocate (__mach_task_self (), &base, |
46 | stacksize, FALSE) != KERN_SUCCESS; base += stacksize) |
47 | ; |
48 | |
49 | if (base >= VM_MAX_ADDRESS) |
50 | { |
51 | if (i == 1) |
52 | { |
53 | next_stack_base = VM_MIN_ADDRESS; |
54 | goto get_stack; |
55 | } |
56 | else |
57 | return EAGAIN; |
58 | } |
59 | |
60 | if (base >= VM_MAX_ADDRESS) |
61 | return EAGAIN; |
62 | |
63 | next_stack_base = base + stacksize; |
64 | |
65 | (*stackaddr) = (void *) base; |
66 | return 0; |
67 | } |
68 | |