mirror of
https://github.com/jart/cosmopolitan.git
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52 lines
2.7 KiB
C
52 lines
2.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above 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 │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/errno.h"
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#include "libc/nexgen32e/bsr.h"
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#include "libc/runtime/runtime.h"
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#include "libc/thread/posixthread.internal.h"
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#include "libc/thread/thread.h"
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#include "libc/thread/tls.h"
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/**
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* Allocates TLS slot.
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*/
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int pthread_key_create(pthread_key_t *key, pthread_key_dtor dtor) {
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int i, j, rc = EAGAIN;
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pthread_spin_lock(&_pthread_keys_lock);
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for (i = 0; i < (PTHREAD_KEYS_MAX + 63) / 64; ++i) {
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if (~_pthread_key_usage[i]) {
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j = bsrl(~_pthread_key_usage[i]);
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_pthread_key_usage[i] |= 1ul << j;
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_pthread_key_dtor[i * 64 + j] = dtor;
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*key = i * 64 + j;
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rc = 0;
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break;
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}
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}
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pthread_spin_unlock(&_pthread_keys_lock);
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return rc;
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}
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static textexit void _pthread_key_atexit(void) {
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_pthread_key_destruct(0);
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}
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__attribute__((__constructor__)) static textstartup void _pthread_key_init() {
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atexit(_pthread_key_atexit);
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}
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