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Write more tests for signal handling

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There's now a much stronger level of assurance that signaling on Windows
will be atomic, low-latency, low tail latency, and shall never deadlock.
This commit is contained in:
Justine Tunney 2024-09-21 05:24:56 -07:00
parent 0e59afb403
commit dd8c4dbd7d
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
19 changed files with 407 additions and 75 deletions
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3
libc/intrin/itoa16.c
View file

@ -18,7 +18,8 @@
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/fmt/internal.h"
__msabi textwindows char16_t *__itoa16(char16_t p[21], uint64_t x) {
__msabi textwindows dontinstrument char16_t *__itoa16(char16_t p[21],
uint64_t x) {
char t;
size_t a, b, i = 0;
do {

3
libc/intrin/sig.c
View file

@ -44,9 +44,8 @@ void __sig_unblock(sigset_t m) {
if (IsWindows() || IsMetal()) {
if (__tls_enabled) {
atomic_store_explicit(&__get_tls()->tib_sigmask, m, memory_order_release);
if (_weaken(__sig_check)) {
if (_weaken(__sig_check))
_weaken(__sig_check)();
}
}
} else {
sys_sigprocmask(SIG_SETMASK, &m, 0);

12
libc/intrin/sigproc.c
View file

@ -29,6 +29,7 @@
#include "libc/nt/enum/pageflags.h"
#include "libc/nt/files.h"
#include "libc/nt/memory.h"
#include "libc/nt/process.h"
#include "libc/nt/runtime.h"
#include "libc/nt/thunk/msabi.h"
#ifdef __x86_64__
@ -42,11 +43,16 @@ __msabi extern typeof(CreateFileMapping) *const __imp_CreateFileMappingW;
__msabi extern typeof(MapViewOfFileEx) *const __imp_MapViewOfFileEx;
__msabi extern typeof(SetEndOfFile) *const __imp_SetEndOfFile;
__msabi extern typeof(SetFilePointer) *const __imp_SetFilePointer;
__msabi extern typeof(GetEnvironmentVariable)
*const __imp_GetEnvironmentVariableW;
__msabi textwindows char16_t *__sig_process_path(char16_t *path, uint32_t pid,
int create_directories) {
// Generates C:\ProgramData\cosmo\sig\x\y.pid like path
__msabi textwindows dontinstrument char16_t *__sig_process_path(
char16_t *path, uint32_t pid, int create_directories) {
char16_t buf[3];
char16_t *p = path;
*p++ = 'C'; // C:\ProgramData\cosmo\sig\x\y.pid
uint32_t vlen = __imp_GetEnvironmentVariableW(u"SYSTEMDRIVE", buf, 3);
*p++ = vlen == 2 ? buf[0] : 'C';
*p++ = ':';
*p++ = '\\';
*p++ = 'P';

7
libc/intrin/sigprocmask-nt.c
View file

@ -47,6 +47,9 @@ textwindows int __sig_mask(int how, const sigset_t *neu, sigset_t *old) {
} else { // SIG_SETMASK
oldmask = atomic_exchange_explicit(mask, *neu, memory_order_acq_rel);
}
if (_weaken(__sig_check)) {
_weaken(__sig_check)();
}
} else {
oldmask = atomic_load_explicit(mask, memory_order_acquire);
}
@ -56,10 +59,6 @@ textwindows int __sig_mask(int how, const sigset_t *neu, sigset_t *old) {
*old = oldmask;
}
if (_weaken(__sig_check)) {
_weaken(__sig_check)();
}
return 0;
}