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https://github.com/jart/cosmopolitan.git
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45 lines
2.6 KiB
C
45 lines
2.6 KiB
C
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/*-*- 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 2020 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/thread/exit.h"
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#include "libc/thread/self.h"
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#include "libc/thread/descriptor.h"
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#include "libc/sysv/consts/nr.h"
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wontreturn void cthread_exit(int rc) {
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cthread_t td = cthread_self();
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td->rc = rc;
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size_t size = (intptr_t)(td->alloc.top) - (intptr_t)(td->alloc.bottom);
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int state;
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asm volatile(
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"lock xadd\t%1, %0\n\t" // mark thread as finished
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"test\t%2, %b1\n\t" // test if thread was detached
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"jz .L.cthread_exit.%=\n\t" // skip unmap if not detached
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"syscall\n" // unmap thread
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".L.cthread_exit.%=:\n\t"
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"mov\t%%rbx, %%rdi\n\t" //rc
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"mov\t$60, %%rax\n\t"
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"syscall" // thread exit
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: "+m"(td->state), "=&r"(state)
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: "I"(cthread_detached), "1"(cthread_finished), "a"(__NR_munmap), "b"(rc), "D"(td->alloc.bottom), "S"(size)
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: "rcx", "r11", "cc", "memory"
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);
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unreachable;
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}
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