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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.
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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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59
libc/intrin/swapcontext.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/macros.h"
// Saves machine to 𝑥 and activates 𝑦, i.e.
//
// getcontext(x);
// setcontext(y);
//
// Except using this API is safer and goes 2x faster:
//
// swapcontext(x, y);
//
// @return 0 on success, or -1 w/ errno
// @returnstwice
.ftrace1
swapcontext:
.ftrace2
#include "libc/intrin/getcontext.inc"
#ifdef __x86_64__
push %rbp
mov %rsp,%rbp
push %rsi
push %rsi
call __swapcontextsig
pop %rdi
pop %rdi
pop %rbp
test %eax,%eax
jnz 1f
#elif defined(__aarch64__)
stp x29,x30,[sp,#-32]!
mov x29,sp
str x1,[sp,16]
bl __swapcontextsig
ldr x1,[sp,16]
ldp x29,x30,[sp],#32
cbnz w0,1f
mov x0,x1
#endif
jmp __tailcontext
1: ret
.endfn swapcontext,globl