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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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22
libc/calls/createpipename.c
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@ -17,26 +17,10 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/atomic.h"
#include "libc/fmt/internal.h"
#include "libc/intrin/atomic.h"
#include "libc/runtime/internal.h"
static textwindows char16_t *itoa16(char16_t p[21], uint64_t x) {
char t;
size_t a, b, i = 0;
do {
p[i++] = x % 10 + '0';
x = x / 10;
} while (x > 0);
if (i) {
for (a = 0, b = i - 1; a < b; ++a, --b) {
t = p[a];
p[a] = p[b];
p[b] = t;
}
}
return p + i;
}
// This function is called very early by WinMain().
textwindows char16_t *__create_pipe_name(char16_t *a) {
char16_t *p = a;
@ -44,9 +28,9 @@ textwindows char16_t *__create_pipe_name(char16_t *a) {
static atomic_uint x;
while (*q)
*p++ = *q++;
p = itoa16(p, __pid);
p = __itoa16(p, __pid);
*p++ = '-';
p = itoa16(p, atomic_fetch_add(&x, 1));
p = __itoa16(p, atomic_fetch_add(&x, 1));
*p = 0;
return a;
}