/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2023 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/dce.h"
#include "libc/intrin/weaken.h"
#include "libc/str/str.h"
#include "libc/thread/tls.h"
#include "third_party/nsync/mu.h"

/**
 * @fileoverview r/w lock for maanging windows file inheritence
 */

static nsync_mu __hand_mu;

void __hand_wipe(void) {
  if (!SupportsWindows()) return;
  bzero(&__hand_mu, sizeof(__hand_mu));
}

void __hand_rlock(void) {
  if (!IsWindows()) return;
  if (_weaken(nsync_mu_rlock) && __threaded) {
    _weaken(nsync_mu_rlock)(&__hand_mu);
  }
}

void __hand_runlock(void) {
  if (!IsWindows()) return;
  if (_weaken(nsync_mu_runlock) && __threaded) {
    _weaken(nsync_mu_runlock)(&__hand_mu);
  }
}

void __hand_lock(void) {
  if (!IsWindows()) return;
  if (_weaken(nsync_mu_lock) && __threaded) {
    _weaken(nsync_mu_lock)(&__hand_mu);
  }
}

void __hand_unlock(void) {
  if (!IsWindows()) return;
  if (_weaken(nsync_mu_unlock) && __threaded) {
    _weaken(nsync_mu_unlock)(&__hand_mu);
  }
}