1/* __pthread_destory_specific. Hurd version.
2 Copyright (C) 2002-2024 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 <pthread.h>
20#include <stdlib.h>
21
22#include <pt-internal.h>
23
24void
25__pthread_destroy_specific (struct __pthread *thread)
26{
27 int i;
28 int seen_one;
29
30 /* Check if there is any thread specific data. */
31 if (thread->thread_specifics == NULL)
32 {
33 for (i = 0; i < PTHREAD_STATIC_KEYS; i++)
34 {
35 if (thread->static_thread_specifics[i] != NULL)
36 break;
37 }
38
39 if (i == PTHREAD_STATIC_KEYS)
40 return;
41 }
42
43 __pthread_key_lock_ready ();
44
45 /* Iterate and call the destructors on any thread specific data. */
46 for (;;)
47 {
48 seen_one = 0;
49
50 __pthread_mutex_lock (&__pthread_key_lock);
51
52 for (i = 0; i < __pthread_key_count; i++)
53 {
54 void *value;
55
56 if (__pthread_key_destructors[i] == PTHREAD_KEY_INVALID)
57 continue;
58
59 if (thread->thread_specifics == NULL)
60 {
61 if (i >= PTHREAD_STATIC_KEYS)
62 break;
63 value = thread->static_thread_specifics[i];
64 }
65 else
66 {
67 if (i >= thread->thread_specifics_size)
68 break;
69 value = thread->thread_specifics[i];
70 }
71
72 if (value != NULL)
73 {
74 if (thread->thread_specifics == NULL)
75 thread->static_thread_specifics[i] = 0;
76 else
77 thread->thread_specifics[i] = 0;
78
79 if (__pthread_key_destructors[i])
80 {
81 seen_one = 1;
82 __pthread_key_destructors[i] (value);
83 }
84 }
85 }
86
87 __pthread_mutex_unlock (&__pthread_key_lock);
88
89 if (!seen_one)
90 break;
91
92 /* This may take a very long time. Let those blocking on
93 pthread_key_create or pthread_key_delete make progress. */
94 __sched_yield ();
95 }
96
97 free (ptr: thread->thread_specifics);
98 thread->thread_specifics = 0;
99 thread->thread_specifics_size = 0;
100 memset (&thread->static_thread_specifics, 0,
101 sizeof (thread->static_thread_specifics));
102}
103

source code of glibc/sysdeps/htl/pt-destroy-specific.c