mirror of
https://github.com/jart/cosmopolitan.git
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52 lines
3 KiB
C
52 lines
3 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/calls/strace.internal.h"
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#include "libc/calls/struct/timespec.h"
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#include "libc/calls/struct/timespec.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/futex.internal.h"
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#include "libc/sysv/consts/futex.h"
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int _futex(void *, int, int, struct timespec *) hidden;
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static dontinline int _futex_wait_impl(void *addr, int expect,
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struct timespec *timeout, int private) {
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int op, ax;
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op = FUTEX_WAIT | private;
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ax = _futex(addr, op, expect, timeout);
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if (SupportsLinux() && private && ax == -ENOSYS) {
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// RHEL5 doesn't support FUTEX_PRIVATE_FLAG
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op = FUTEX_WAIT;
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ax = _futex(addr, op, expect, timeout);
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}
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if (IsOpenbsd() && ax > 0) ax = -ax; // yes openbsd does this w/o cf
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STRACE("futex(%t, %s, %d, %s) → %s", addr, DescribeFutexOp(op), expect,
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DescribeTimespec(0, timeout), DescribeFutexResult(ax));
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return ax;
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}
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int _futex_wait_public(void *addr, int expect, struct timespec *timeout) {
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return _futex_wait_impl(addr, expect, timeout, 0);
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}
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int _futex_wait_private(void *addr, int expect, struct timespec *timeout) {
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return _futex_wait_impl(addr, expect, timeout, FUTEX_PRIVATE_FLAG);
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}
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