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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/read-nt.c
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@ -53,7 +53,7 @@ static textwindows ssize_t sys_read_nt_impl(struct Fd *fd, void *data,
if (fd->flags & O_NONBLOCK) {
return eagain();
}
if (_check_interrupts(true, g_fds.p)) {
if (_check_interrupts(kSigOpRestartable, g_fds.p)) {
POLLTRACE("sys_read_nt interrupted");
return -1;
}
@ -105,7 +105,7 @@ textwindows ssize_t sys_read_nt(struct Fd *fd, const struct iovec *iov,
uint32_t size;
size_t i, total;
if (opt_offset < -1) return einval();
if (_check_interrupts(true, fd)) return -1;
if (_check_interrupts(kSigOpRestartable, fd)) return -1;
while (iovlen && !iov[0].iov_len) iov++, iovlen--;
if (iovlen) {
for (total = i = 0; i < iovlen; ++i) {