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Make fork() go 30% faster

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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
This commit is contained in:
Justine Tunney 2025-01-01 04:59:38 -08:00
parent 98c5847727
commit 0b3c81dd4e
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GPG key ID: BE714B4575D6E328
44 changed files with 769 additions and 649 deletions
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18
libc/nt/kernel32/VirtualQueryEx.S Normal file
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@ -0,0 +1,18 @@
#include "libc/nt/codegen.h"
.imp kernel32,__imp_VirtualQueryEx,VirtualQueryEx
.text.windows
.ftrace1
VirtualQueryEx:
.ftrace2
#ifdef __x86_64__
push %rbp
mov %rsp,%rbp
mov __imp_VirtualQueryEx(%rip),%rax
jmp __sysv2nt
#elif defined(__aarch64__)
mov x0,#0
ret
#endif
.endfn VirtualQueryEx,globl
.previous