67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
/*
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* Copyright (c) 2014 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* pthread/pthread_key_create.c
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* Thread-specific data key creation.
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*/
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#include <errno.h>
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#include <pthread.h>
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#include <stdlib.h>
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static void noop_destructor(void* ctx)
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{
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(void) ctx;
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}
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int pthread_key_create(pthread_key_t* key, void (*destructor)(void*))
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{
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if ( !destructor )
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destructor = noop_destructor;
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pthread_mutex_lock(&__pthread_keys_lock);
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if ( __pthread_keys_used < __pthread_keys_length )
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{
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size_t result_key = 0;
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while ( __pthread_keys[result_key].destructor )
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result_key++;
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__pthread_keys[__pthread_keys_used++, *key = result_key].destructor = destructor;
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}
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else
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{
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size_t old_length = __pthread_keys_length;
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size_t new_length = old_length ? old_length * 2 : 8;
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size_t new_size = sizeof(struct pthread_key) * new_length;
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struct pthread_key* new_keys =
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(struct pthread_key*) realloc(__pthread_keys, new_size);
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if ( !new_keys )
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{
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pthread_mutex_unlock(&__pthread_keys_lock);
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return errno;
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}
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__pthread_keys = new_keys;
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__pthread_keys_length = new_length;
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for ( size_t i = old_length; i < new_length; i++ )
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new_keys[i].destructor = NULL;
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__pthread_keys[__pthread_keys_used++, *key = old_length].destructor = destructor;
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}
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pthread_mutex_unlock(&__pthread_keys_lock);
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return 0;
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}
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