mirror of
https://github.com/jart/cosmopolitan.git
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44 lines
2.7 KiB
C
44 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/bits/asmflag.h"
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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/intrin/describeflags.internal.h"
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#include "libc/intrin/futex.internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/futex.h"
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#include "libc/sysv/consts/nr.h"
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privileged int _futex_wait(void *addr, int expect, struct timespec *timeout) {
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int ax;
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bool cf;
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char buf[45];
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asm volatile(CFLAG_ASM("mov\t%6,%%r10\n\t"
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"clc\n\t"
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"syscall")
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: CFLAG_CONSTRAINT(cf), "=a"(ax)
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: "1"(__NR_futex), "D"(addr), "S"(FUTEX_WAIT), "d"(expect),
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"g"(timeout)
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: "rcx", "r10", "r11", "memory");
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if (cf) ax = -ax;
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STRACE("futex(%p, FUTEX_WAIT, %d, %s) → %s", addr, expect,
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DescribeTimespec(buf, sizeof(buf), 0, timeout),
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ax ? strerrno(-ax) : "0");
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return ax;
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}
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