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Get fork() working on Windows

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This is done without using Microsoft's internal APIs. MAP_PRIVATE
mappings are copied to the subprocess via a pipe, since Microsoft
doesn't want us to have proper COW pages. MAP_SHARED mappings are
remapped without needing to do any copying. Global variables need
copying along with the stack and the whole heap of anonymous mem.
This actually improves the reliability of the redbean http server
although one shouldn't expect 10k+ connections on a home computer
that isn't running software built to serve like Linux or FreeBSD.
This commit is contained in:
Justine Tunney 2020-11-13 01:27:49 -08:00
parent aea89fe832
commit db33973e0a
105 changed files with 1476 additions and 912 deletions
Download patch file Download diff file Expand all files Collapse all files

16
examples/forkrand.c
View file

@ -7,18 +7,20 @@
│ • http://creativecommons.org/publicdomain/zero/1.0/ │
╚─────────────────────────────────────────────────────────────────*/
#endif
#include "libc/calls/calls.h"
#include "libc/log/check.h"
#include "libc/log/log.h"
#include "libc/nt/nt/process.h"
#include "libc/rand/rand.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
#include "libc/calls/calls.h"
#include "libc/time/time.h"
noinline void dostuff(void) {
int i, us;
srand(rand64()); /* seeds rand() w/ intel rdrnd, auxv, etc. */
for (unsigned i = 0; i < 5; ++i) {
int us = rand() % 500000;
for (i = 0; i < 5; ++i) {
us = rand() % 500000;
usleep(us);
printf("%s%u%s%u [%s=%d]\n", "hello no. ", i, " from ", getpid(), "us", us);
fflush(stdout);
@ -26,9 +28,8 @@ noinline void dostuff(void) {
}
int main(int argc, char *argv[]) {
fprintf(stderr, "%p\n", RtlCloneUserProcess);
int child;
if ((child = fork()) == -1) perror("fork"), exit(1);
int rc, child, wstatus;
CHECK_NE(-1, (child = fork()));
if (!child) {
/* child process */
dostuff();
@ -37,8 +38,7 @@ int main(int argc, char *argv[]) {
/* parent process */
dostuff();
/* note: abandoned children become zombies */
int rc, wstatus;
if ((rc = wait(&wstatus)) == -1) perror("wait"), exit(1);
CHECK_NE(-1, (rc = wait(&wstatus)));
return WEXITSTATUS(wstatus);
}
}