mirror of
https://github.com/jart/cosmopolitan.git
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91 lines
4.3 KiB
C
91 lines
4.3 KiB
C
/*-*- 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 2022 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/dce.h"
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#include "libc/intrin/asmflag.h"
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#include "libc/nt/thread.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/syslib.internal.h"
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#include "libc/sysv/consts/nr.h"
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#include "libc/thread/tls.h"
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__msabi extern typeof(ExitThread) *const __imp_ExitThread;
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/**
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* Terminates thread with raw system call.
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*
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* The function you want is pthread_exit(). If you call this function
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* whilst using the pthreads then your joiners might not get woken up
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* on non-Linux platforms where we zero __get_tls()->tib_tid manually
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*
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* If this is the main thread, or an orphaned child thread, then this
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* function is equivalent to exiting the process; however, `rc` shall
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* only be reported to the parent process on Linux, FreeBSD & Windows
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* whereas on other platforms, it'll be silently coerced to zero.
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*
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* @param rc only works on Linux and Windows
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* @see cthread_exit()
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* @noreturn
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*/
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wontreturn void _Exit1(int rc) {
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#ifdef __x86_64__
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char cf;
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int ax, dx, di, si;
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if (!IsWindows() && !IsMetal()) {
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// exit() on Linux
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// thr_exit() on FreeBSD
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// __threxit() on OpenBSD
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// __lwp_exit() on NetBSD
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// __bsdthread_terminate() on XNU
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asm volatile(CFLAG_ASM("xor\t%%r10d,%%r10d\n\t"
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"syscall")
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: CFLAG_CONSTRAINT(cf), "=a"(ax), "=d"(dx), "=D"(di), "=S"(si)
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: "1"(__NR_exit), "3"(IsLinux() ? rc : 0), "4"(0), "2"(0)
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: "rcx", "r8", "r9", "r10", "r11", "memory");
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if ((IsFreebsd() && !cf && !ax) || (SupportsFreebsd() && IsTiny())) {
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// FreeBSD checks if this is either the main thread by itself, or
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// the last running child thread in which case thr_exit() returns
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// zero with an error. In that case we'll exit the whole process.
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// FreeBSD thr_exit() can even clobber registers, like r8 and r9!
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asm volatile("syscall"
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: /* no outputs */
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: "a"(__NR_exit_group), "D"(rc)
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: "rcx", "r11", "memory");
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__builtin_unreachable();
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}
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} else if (IsWindows()) {
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__imp_ExitThread(rc);
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__builtin_unreachable();
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}
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notpossible;
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#elif defined(__aarch64__)
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if (IsLinux()) {
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register long r0 asm("x0") = rc;
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asm volatile("mov\tx8,%0\n\t"
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"svc\t0"
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: /* no outputs */
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: "i"(93), "r"(r0)
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: "x8", "memory");
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} else if (IsXnu()) {
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__syslib->__pthread_exit(0);
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}
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notpossible;
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#else
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#error "arch unsupported"
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#endif
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}
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