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https://github.com/jart/cosmopolitan.git
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2d43d400c6
Cosmo now has a non-nsync implementation of POSIX read-write locks. It's possible to call pthread_rwlockattr_setpshared in PTHREAD_PROCESS_SHARED mode. Furthermore, if cosmo is built with PTHREAD_USE_NSYNC set to zero, then Cosmo shouldn't use nsync at all. That's helpful if you want to not link any Apache 2.0 licensed code.
33 lines
2.2 KiB
C
33 lines
2.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/thread/thread.h"
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/**
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* Initializes read-write lock.
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*
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* @param attr may be null
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* @return 0 on success, or error number on failure
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*/
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errno_t pthread_rwlock_init(pthread_rwlock_t *rwlock,
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const pthread_rwlockattr_t *attr) {
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*rwlock = (pthread_rwlock_t){
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._pshared = attr ? *attr : PTHREAD_PROCESS_PRIVATE,
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};
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return 0;
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}
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