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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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8
libc/intrin/describemapping.c
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@ -17,6 +17,7 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/intrin/describeflags.h"
#include "libc/intrin/maps.h"
#include "libc/runtime/memtrack.internal.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/consts/prot.h"
@ -24,12 +25,13 @@
static char DescribeMapType(int flags) {
switch (flags & MAP_TYPE) {
case MAP_FILE:
if (flags & MAP_NOFORK)
return 'i'; // executable image
return '-';
case MAP_PRIVATE:
if (flags & MAP_NOFORK)
return 'P';
else
return 'p';
return 'w'; // windows memory
return 'p';
case MAP_SHARED:
return 's';
default: