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Introduce interprocess signaling on Windows

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This change gets rsync working without any warning or errors. On Windows
we now create a bunch of C:\var\sig\x\y.pid shared memory files, so sigs
can be delivered between processes. WinMain() creates this file when the
process starts. If the program links signaling system calls then we make
a thread at startup too, which allows asynchronous delivery each quantum
and cancelation points can spot these signals potentially faster on wait

See #1240
This commit is contained in:
Justine Tunney 2024-09-19 03:02:13 -07:00
parent 8527462b95
commit 0d74673213
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GPG key ID: BE714B4575D6E328
22 changed files with 302 additions and 62 deletions
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16
libc/proc/fork-nt.c
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@ -196,9 +196,13 @@ textwindows void WinMainForked(void) {
int64_t reader;
int64_t savetsc;
uint32_t varlen;
atomic_ulong *sigproc;
char16_t fvar[21 + 1 + 21 + 1];
struct Fds *fds = __veil("r", &g_fds);
// save signal pointer
sigproc = __sig.process;
// check to see if the process was actually forked
// this variable should have the pipe handle numba
varlen = GetEnvironmentVariable(u"_FORK", fvar, ARRAYLEN(fvar));
@ -295,12 +299,13 @@ textwindows void WinMainForked(void) {
fds->p[1].handle = GetStdHandle(kNtStdOutputHandle);
fds->p[2].handle = GetStdHandle(kNtStdErrorHandle);
// restore signal pointer
__sig.process = sigproc;
// restore the crash reporting stuff
#if SYSDEBUG
RemoveVectoredExceptionHandler(oncrash);
#endif
if (_weaken(__sig_init))
_weaken(__sig_init)();
// jump back into function below
longjmp(jb, 1);
@ -460,15 +465,16 @@ textwindows int sys_fork_nt(uint32_t dwCreationFlags) {
__morph_tls();
__tls_enabled = true;
// the child's pending signals is initially empty
atomic_store_explicit(&__sig.pending, 0, memory_order_relaxed);
atomic_store_explicit(__sig.process, 0, memory_order_relaxed);
atomic_store_explicit(&tib->tib_sigpending, 0, memory_order_relaxed);
// re-apply code morphing for function tracing
if (ftrace_stackdigs) {
if (ftrace_stackdigs)
_weaken(__hook)(_weaken(ftrace_hook), _weaken(GetSymbolTable)());
}
// reset core runtime services
__proc_wipe();
WipeKeystrokes();
if (_weaken(__sig_init))
_weaken(__sig_init)();
if (_weaken(__itimer_wipe))
_weaken(__itimer_wipe)();
// notify pthread join