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Revert "Make spin locks go faster"

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This reverts commit c8e25d811c.
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Justine Tunney 2024-07-25 22:24:32 -07:00
parent 0679cfeb41
commit 02e1cbcd00
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16 changed files with 122 additions and 149 deletions
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34
libc/intrin/pthread_spin_init.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/intrin/atomic.h"
#include "libc/thread/thread.h"
/**
* Initializes spin lock.
*
* @param pshared is ignored, since this implementation always permits
* multiple processes to operate on the same spin locks
* @return 0 on success, or errno on error
* @see pthread_spin_destroy
* @see pthread_spin_lock
*/
errno_t pthread_spin_init(pthread_spinlock_t *spin, int pshared) {
atomic_store_explicit(&spin->_lock, 0, memory_order_relaxed);
return 0;
}