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[WIP] Threading (#282)

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* Thread creation
* Proper thread creation and exit
* Join/Detach protocol
* Added semaphore with futex (hopefully fast)
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Florian Lemaitre 2021-10-13 20:26:05 +02:00 • committed by GitHub
parent d852640a1e
commit a0b39f886c
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30 changed files with 792 additions and 12 deletions
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libc/thread/exit.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/thread/exit.h"
#include "libc/thread/self.h"
#include "libc/thread/descriptor.h"
#include "libc/sysv/consts/nr.h"
wontreturn void cthread_exit(int rc) {
cthread_t td = cthread_self();
td->rc = rc;
size_t size = (intptr_t)(td->alloc.top) - (intptr_t)(td->alloc.bottom);
int state;
asm volatile(
"lock xadd\t%1, %0\n\t" // mark thread as finished
"test\t%2, %b1\n\t" // test if thread was detached
"jz .L.cthread_exit.%=\n\t" // skip unmap if not detached
"syscall\n" // unmap thread
".L.cthread_exit.%=:\n\t"
"mov\t%%rbx, %%rdi\n\t" //rc
"mov\t$60, %%rax\n\t"
"syscall" // thread exit
: "+m"(td->state), "=&r"(state)
: "I"(cthread_detached), "1"(cthread_finished), "a"(__NR_munmap), "b"(rc), "D"(td->alloc.bottom), "S"(size)
: "rcx", "r11", "cc", "memory"
);
unreachable;
}