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[WIP] Threading phase 2 (#301)

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* Exponential back-off
* Removed "native" specifier
* Abstract away Futex for cthread
* Complete setup for TLS (including main thread)
This commit is contained in:
Florian Lemaitre 2021-10-26 01:02:26 +02:00 • committed by GitHub
parent 660ff56d40
commit 45a7435788
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11 changed files with 249 additions and 78 deletions
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libc/thread/wait.c Normal file
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/*-*- 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 2020 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/futex.h"
#include "libc/sysv/consts/nr.h"
#include "libc/thread/wait.h"
int cthread_memory_wait32(uint32_t* addr, uint32_t val,
const struct timespec* timeout) {
if (__NR_futex != 0xfff) {
int flags = FUTEX_WAIT;
int rc;
register struct timespec* timeout_ asm("r10") = timeout;
asm volatile("syscall"
: "=a"(rc)
: "0"(__NR_futex), "D"(addr), "S"(flags), "d"(val),
"r"(timeout_)
: "rcx", "r11", "cc", "memory");
return rc;
}
return -1;
}
int cthread_memory_wake32(uint32_t* addr, int n) {
if (__NR_futex != 0xfff) {
int flags = FUTEX_WAKE;
int rc;
asm volatile("syscall"
: "=a"(rc)
: "0"(__NR_futex), "D"(addr), "S"(flags), "d"(n)
: "rcx", "r11", "cc", "memory");
return rc;
}
return -1;
}