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Make forking off threads reliable on Windows

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This change makes posix_spawn_test no longer flaky on Windows, by (1)
fixing a race condition in wait(), and (2) removing a misguided vfork
implementation which was letting Windows bypass pthread_atfork().
This commit is contained in:
Justine Tunney 2023-07-30 08:55:01 -07:00
parent 2ebc5781a1
commit 58352df0a4
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GPG key ID: BE714B4575D6E328
30 changed files with 230 additions and 187 deletions
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4
libc/calls/wait4.c
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@ -55,7 +55,9 @@ int wait4(int pid, int *opt_out_wstatus, int options,
} else {
rc = sys_wait4_nt(pid, &ws, options, opt_out_rusage);
}
if (rc != -1 && opt_out_wstatus) *opt_out_wstatus = ws;
if (rc != -1 && opt_out_wstatus) {
*opt_out_wstatus = ws;
}
END_CANCELLATION_POINT;
STRACE("wait4(%d, [%#x], %d, %p) → %d% m", pid, ws, options, opt_out_rusage,