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84 lines
2.9 KiB
C
84 lines
2.9 KiB
C
/* pthread_key internal declarations for the Hurd version.
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Copyright (C) 2002-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <pthread.h>
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#include <libc-lockP.h>
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#include <pthreadP.h>
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/* When using e.g. jemalloc, we need to be able to create and use keys before
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being able to allocate. */
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#define PTHREAD_STATIC_KEYS 4
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#define PTHREAD_KEY_MEMBERS \
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void **thread_specifics; /* This is only resized by the thread, and always growing */ \
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unsigned thread_specifics_size; /* Number of entries in thread_specifics */ \
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void *static_thread_specifics[PTHREAD_STATIC_KEYS]; /* Static storage for a few entries */
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#define PTHREAD_KEY_INVALID (void *) (-1)
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/* __PTHREAD_KEY_DESTRUCTORS is an array of destructors with
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__PTHREAD_KEY_SIZE elements. If an element with index less than
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__PTHREAD_KEY_COUNT is invalid, it shall contain the value
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PTHREAD_KEY_INVALID which shall be distinct from NULL.
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Normally, we just add new keys to the end of the array and realloc
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it as necessary. The pthread_key_create routine may decide to
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rescan the array if __PTHREAD_KEY_FREE is large. */
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extern void (**__pthread_key_destructors) (void *arg);
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extern int __pthread_key_size;
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extern int __pthread_key_count;
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/* Number of invalid elements in the array. Does not include elements
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for which memory has been allocated but which have not yet been
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used (i.e. those elements with indexes greater than
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__PTHREAD_KEY_COUNT). */
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extern int __pthread_key_invalid_count;
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/* Protects the above variables. This must be a recursive lock: the
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destructors may call pthread_key_delete. */
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extern pthread_mutex_t __pthread_key_lock;
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/* Protects the initialization of the mutex above. */
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extern pthread_once_t __pthread_key_once;
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#include <assert.h>
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static inline void
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__pthread_key_lock_ready (void)
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{
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void do_init (void)
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{
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int err;
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pthread_mutexattr_t attr;
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err = __pthread_mutexattr_init (&attr);
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assert_perror (err);
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err = __pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);
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assert_perror (err);
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err = __pthread_mutex_init (&__pthread_key_lock, &attr);
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assert_perror (err);
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err = __pthread_mutexattr_destroy (&attr);
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assert_perror (err);
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}
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__pthread_once (&__pthread_key_once, do_init);
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}
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