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| 1 | /* pthread_key internal declatations for the Hurd version. |
|---|---|
| 2 | Copyright (C) 2002-2022 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 <pthread.h> |
| 20 | #include <libc-lockP.h> |
| 21 | #include <pthreadP.h> |
| 22 | |
| 23 | #define PTHREAD_KEY_MEMBERS \ |
| 24 | void **thread_specifics; /* This is only resized by the thread, and always growing */ \ |
| 25 | unsigned thread_specifics_size; /* Number of entries in thread_specifics */ |
| 26 | |
| 27 | #define PTHREAD_KEY_INVALID (void *) (-1) |
| 28 | |
| 29 | |
| 30 | /* __PTHREAD_KEY_DESTRUCTORS is an array of destructors with |
| 31 | __PTHREAD_KEY_SIZE elements. If an element with index less than |
| 32 | __PTHREAD_KEY_COUNT is invalid, it shall contain the value |
| 33 | PTHREAD_KEY_INVALID which shall be distinct from NULL. |
| 34 | |
| 35 | Normally, we just add new keys to the end of the array and realloc |
| 36 | it as necessary. The pthread_key_create routine may decide to |
| 37 | rescan the array if __PTHREAD_KEY_FREE is large. */ |
| 38 | extern void (**__pthread_key_destructors) (void *arg); |
| 39 | extern int __pthread_key_size; |
| 40 | extern int __pthread_key_count; |
| 41 | /* Number of invalid elements in the array. Does not include elements |
| 42 | for which memory has been allocated but which have not yet been |
| 43 | used (i.e. those elements with indexes greater than |
| 44 | __PTHREAD_KEY_COUNT). */ |
| 45 | extern int __pthread_key_invalid_count; |
| 46 | |
| 47 | /* Protects the above variables. This must be a recursive lock: the |
| 48 | destructors may call pthread_key_delete. */ |
| 49 | extern pthread_mutex_t __pthread_key_lock; |
| 50 | |
| 51 | #include <assert.h> |
| 52 | |
| 53 | static inline void |
| 54 | __pthread_key_lock_ready (void) |
| 55 | { |
| 56 | static pthread_once_t o = PTHREAD_ONCE_INIT; |
| 57 | |
| 58 | void do_init (void) |
| 59 | { |
| 60 | int err; |
| 61 | pthread_mutexattr_t attr; |
| 62 | |
| 63 | err = __pthread_mutexattr_init (&attr); |
| 64 | assert_perror (err); |
| 65 | |
| 66 | err = __pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE); |
| 67 | assert_perror (err); |
| 68 | |
| 69 | err = __pthread_mutex_init (&__pthread_key_lock, &attr); |
| 70 | assert_perror (err); |
| 71 | |
| 72 | err = __pthread_mutexattr_destroy (&attr); |
| 73 | assert_perror (err); |
| 74 | } |
| 75 | |
| 76 | __pthread_once (&o, do_init); |
| 77 | } |
| 78 |
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