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0b3c81dd4e
This change makes fork() go nearly as fast as sys_fork() on UNIX. As for Windows this change shaves about 4-5ms off fork() + wait() latency. This is accomplished by using WriteProcessMemory() from the parent process to setup the address space of a suspended process; it is better than a pipe
48 lines
2.6 KiB
C
48 lines
2.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 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/intrin/atomic.h"
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#include "libc/log/libfatal.internal.h"
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#include "libc/nt/thread.h"
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#include "libc/nt/thunk/msabi.h"
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#include "libc/runtime/runtime.h"
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#include "libc/thread/tls.h"
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#ifdef __x86_64__
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__msabi extern typeof(GetCurrentThreadId) *const __imp_GetCurrentThreadId;
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/**
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* Initializes bare minimum TLS for Windows thread.
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*/
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textwindows dontinstrument void __bootstrap_tls(struct CosmoTib *tib,
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char *bp) {
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__repstosb(tib, 0, sizeof(*tib));
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tib->tib_self = tib;
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tib->tib_self2 = tib;
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tib->tib_sigmask = -1;
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tib->tib_strace = -100;
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tib->tib_ftrace = -100;
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tib->tib_sigstack_size = 57344;
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tib->tib_sigstack_addr = bp - 57344;
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int tid = __imp_GetCurrentThreadId();
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atomic_init(&tib->tib_ptid, tid);
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atomic_init(&tib->tib_ctid, tid);
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__set_tls_win32(tib);
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}
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#endif /* __x86_64__ */
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