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Overhaul Windows signal handling

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The new asynchronous signal delivery technique is now also being used
for tkill(), raise(), etc. Many subtle issues have been addresesd. We
now signal handling on Windows that's remarkably similar to the POSIX
behaviors. However that's just across threads. We're lacking a way to
have the signal semantics work well, across multiple WIN32 processes.
This commit is contained in:
Justine Tunney 2023-09-08 01:49:41 -07:00
parent 8bdaddd81d
commit 99dc1281f5
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GPG key ID: BE714B4575D6E328
38 changed files with 635 additions and 279 deletions
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4
libc/calls/read-nt.c
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@ -17,6 +17,7 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/calls/bo.internal.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/sig.internal.h"
@ -113,6 +114,7 @@ StartOver:
// since for overlapped i/o, we always use GetOverlappedResult
ok = ReadFile(handle, targetdata, targetsize, 0, &overlap);
if (!ok && GetLastError() == kNtErrorIoPending) {
BEGIN_BLOCKING_OPERATION;
// the i/o operation is in flight; blocking is unavoidable
// if we're in a non-blocking mode, then immediately abort
// if an interrupt is pending then we abort before waiting
@ -141,6 +143,7 @@ StartOver:
}
}
ok = true;
END_BLOCKING_OPERATION;
}
if (ok) {
// overlapped is allocated on stack, so it's important we wait
@ -219,7 +222,6 @@ textwindows ssize_t sys_read_nt(int fd, const struct iovec *iov, size_t iovlen,
ssize_t rc;
size_t i, total;
if (opt_offset < -1) return einval();
if (_check_interrupts(kSigOpRestartable)) return -1;
while (iovlen && !iov[0].iov_len) iov++, iovlen--;
if (iovlen) {
for (total = i = 0; i < iovlen; ++i) {