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2cfef0b0 FW |
1 | /* Deallocation thread-specific data structures related to pthread_key_create. |
2 | This file is part of the GNU C Library. | |
2cfef0b0 FW |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
15 | License along with the GNU C Library; if not, see | |
16 | <https://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include <pthreadP.h> | |
19 | ||
20 | /* Deallocate POSIX thread-local-storage. */ | |
21 | void | |
22 | __nptl_deallocate_tsd (void) | |
23 | { | |
24 | struct pthread *self = THREAD_SELF; | |
25 | ||
26 | /* Maybe no data was ever allocated. This happens often so we have | |
27 | a flag for this. */ | |
28 | if (THREAD_GETMEM (self, specific_used)) | |
29 | { | |
30 | size_t round; | |
31 | size_t cnt; | |
32 | ||
33 | round = 0; | |
34 | do | |
35 | { | |
36 | size_t idx; | |
37 | ||
38 | /* So far no new nonzero data entry. */ | |
39 | THREAD_SETMEM (self, specific_used, false); | |
40 | ||
41 | for (cnt = idx = 0; cnt < PTHREAD_KEY_1STLEVEL_SIZE; ++cnt) | |
42 | { | |
43 | struct pthread_key_data *level2; | |
44 | ||
45 | level2 = THREAD_GETMEM_NC (self, specific, cnt); | |
46 | ||
47 | if (level2 != NULL) | |
48 | { | |
49 | size_t inner; | |
50 | ||
51 | for (inner = 0; inner < PTHREAD_KEY_2NDLEVEL_SIZE; | |
52 | ++inner, ++idx) | |
53 | { | |
54 | void *data = level2[inner].data; | |
55 | ||
56 | if (data != NULL) | |
57 | { | |
58 | /* Always clear the data. */ | |
59 | level2[inner].data = NULL; | |
60 | ||
61 | /* Make sure the data corresponds to a valid | |
62 | key. This test fails if the key was | |
63 | deallocated and also if it was | |
64 | re-allocated. It is the user's | |
65 | responsibility to free the memory in this | |
66 | case. */ | |
67 | if (level2[inner].seq | |
68 | == __pthread_keys[idx].seq | |
69 | /* It is not necessary to register a destructor | |
70 | function. */ | |
71 | && __pthread_keys[idx].destr != NULL) | |
72 | /* Call the user-provided destructor. */ | |
73 | __pthread_keys[idx].destr (data); | |
74 | } | |
75 | } | |
76 | } | |
77 | else | |
78 | idx += PTHREAD_KEY_1STLEVEL_SIZE; | |
79 | } | |
80 | ||
81 | if (THREAD_GETMEM (self, specific_used) == 0) | |
82 | /* No data has been modified. */ | |
83 | goto just_free; | |
84 | } | |
85 | /* We only repeat the process a fixed number of times. */ | |
86 | while (__builtin_expect (++round < PTHREAD_DESTRUCTOR_ITERATIONS, 0)); | |
87 | ||
88 | /* Just clear the memory of the first block for reuse. */ | |
89 | memset (&THREAD_SELF->specific_1stblock, '\0', | |
90 | sizeof (self->specific_1stblock)); | |
91 | ||
92 | just_free: | |
93 | /* Free the memory for the other blocks. */ | |
94 | for (cnt = 1; cnt < PTHREAD_KEY_1STLEVEL_SIZE; ++cnt) | |
95 | { | |
96 | struct pthread_key_data *level2; | |
97 | ||
98 | level2 = THREAD_GETMEM_NC (self, specific, cnt); | |
99 | if (level2 != NULL) | |
100 | { | |
101 | /* The first block is allocated as part of the thread | |
102 | descriptor. */ | |
103 | free (level2); | |
104 | THREAD_SETMEM_NC (self, specific, cnt, NULL); | |
105 | } | |
106 | } | |
107 | ||
108 | THREAD_SETMEM (self, specific_used, false); | |
109 | } | |
110 | } | |
111 | libc_hidden_def (__nptl_deallocate_tsd) |