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Introduce cosmo_futex_wait and cosmo_futex_wake

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Cosmopolitan Futexes are now exposed as a public API.
This commit is contained in:
Justine Tunney 2024-11-22 11:08:29 -08:00
parent 729f7045e3
commit 9ddbfd921e
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66 changed files with 886 additions and 917 deletions
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libc/intrin/cosmo_futex_thunk.S Normal file
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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
│ vi: set noet ft=asm ts=8 sw=8 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/sysv/consts/nr.h"
#include "libc/macros.h"
.privileged
cosmo_futex_thunk:
#ifdef __x86_64__
push %rbp
mov %rsp,%rbp
mov %rcx,%r10
mov __NR_futex,%eax
clc
syscall
jnc 1f
neg %eax
1: pop %rbp
#elif defined(__aarch64__)
ldr x7,=__hostos
ldr w7,[x7]
tst x7,1 // IsLinux()
mov x7,98 // futex (Linux)
mov x8,454 // _umtx_op (FreeBSD)
csel x8,x7,x8,ne // choose syscall magnum
mov x7,0 // clear carry (for Linux)
adds x7,x7,0 // clear carry
svc #0 // call kernel
bcc 1f // jump if not carry
neg x0,x0 // linux style errno
#else
#error "unsupported architecture"
#endif /* __x86_64__ */
1: ret
.endfn cosmo_futex_thunk,globl,hidden