Mercurial > hg > nginx
annotate src/core/ngx_crc32.h @ 6133:af7eba90645d
Win32: shared memory base addresses and remapping.
Two mechanisms are implemented to make it possible to store pointers
in shared memory on Windows, in particular on Windows Vista and later
versions with ASLR:
- The ngx_shm_remap() function added to allow remapping of a shared memory
zone to the address originally used for it in the master process. While
important, it doesn't solve the problem by itself as in many cases it's
not possible to use the address because of conflicts with other
allocations.
- We now create mappings at the same address in all processes by starting
mappings at predefined addresses normally unused by newborn processes.
These two mechanisms combined allow to use shared memory on Windows
almost without problems, including reloads.
Based on the patch by Sergey Brester:
http://mailman.nginx.org/pipermail/nginx-devel/2015-April/006836.html
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Mon, 27 Apr 2015 18:25:42 +0300 |
parents | d620f497c50f |
children |
rev | line source |
---|---|
790 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
790 | 5 */ |
6 | |
7 | |
8 #ifndef _NGX_CRC32_H_INCLUDED_ | |
9 #define _NGX_CRC32_H_INCLUDED_ | |
10 | |
11 | |
12 #include <ngx_config.h> | |
13 #include <ngx_core.h> | |
14 | |
15 | |
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
16 extern uint32_t *ngx_crc32_table_short; |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
17 extern uint32_t ngx_crc32_table256[]; |
790 | 18 |
19 | |
20 static ngx_inline uint32_t | |
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
21 ngx_crc32_short(u_char *p, size_t len) |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
22 { |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
23 u_char c; |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
24 uint32_t crc; |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
25 |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
26 crc = 0xffffffff; |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
27 |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
28 while (len--) { |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
29 c = *p++; |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
30 crc = ngx_crc32_table_short[(crc ^ (c & 0xf)) & 0xf] ^ (crc >> 4); |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
31 crc = ngx_crc32_table_short[(crc ^ (c >> 4)) & 0xf] ^ (crc >> 4); |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
32 } |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
33 |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
34 return crc ^ 0xffffffff; |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
35 } |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
36 |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
37 |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
38 static ngx_inline uint32_t |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
39 ngx_crc32_long(u_char *p, size_t len) |
790 | 40 { |
41 uint32_t crc; | |
42 | |
43 crc = 0xffffffff; | |
44 | |
45 while (len--) { | |
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
46 crc = ngx_crc32_table256[(crc ^ *p++) & 0xff] ^ (crc >> 8); |
790 | 47 } |
48 | |
49 return crc ^ 0xffffffff; | |
50 } | |
51 | |
52 | |
1694
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
53 #define ngx_crc32_init(crc) \ |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
54 crc = 0xffffffff |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
55 |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
56 |
1697 | 57 static ngx_inline void |
1694
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
58 ngx_crc32_update(uint32_t *crc, u_char *p, size_t len) |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
59 { |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
60 uint32_t c; |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
61 |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
62 c = *crc; |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
63 |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
64 while (len--) { |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
65 c = ngx_crc32_table256[(c ^ *p++) & 0xff] ^ (c >> 8); |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
66 } |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
67 |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
68 *crc = c; |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
69 } |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
70 |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
71 |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
72 #define ngx_crc32_final(crc) \ |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
73 crc ^= 0xffffffff |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
74 |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
75 |
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
930
diff
changeset
|
76 ngx_int_t ngx_crc32_table_init(void); |
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
77 |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
changeset
|
78 |
790 | 79 #endif /* _NGX_CRC32_H_INCLUDED_ */ |