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Put more thought into new signaling code

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Justine Tunney 2024-09-19 20:13:55 -07:00
parent 6107eb38f9
commit f68fc1f815
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GPG key ID: BE714B4575D6E328
10 changed files with 127 additions and 51 deletions
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21
libc/calls/sig.c
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@ -596,6 +596,9 @@ static textwindows int __sig_console_sig(uint32_t dwCtrlType) {
}
__msabi textwindows dontinstrument bool32 __sig_console(uint32_t dwCtrlType) {
// win32 launches a thread to deliver ctrl-c and ctrl-break when typed
// it only happens when kNtEnableProcessedInput is in play on console.
// otherwise we need to wait until read-nt.c discovers that keystroke.
struct CosmoTib tls;
__bootstrap_tls(&tls, __builtin_frame_address(0));
__sig_generate(__sig_console_sig(dwCtrlType), SI_KERNEL);
@ -616,7 +619,12 @@ textwindows int __sig_check(void) {
}
}
// delivers signals from other processes asynchronously
// background thread for delivering inter-process signals asynchronously
// this checks for undelivered process-wide signals, once per scheduling
// quantum, which on windows should be every ~15ms or so, unless somehow
// the process was tuned to have more fine-grained event timing. we want
// signals to happen faster when possible; that happens when cancelation
// points, e.g. read need to wait on i/o; they too check for new signals
textwindows dontinstrument static uint32_t __sig_worker(void *arg) {
struct CosmoTib tls;
__bootstrap_tls(&tls, __builtin_frame_address(0));
@ -624,9 +632,16 @@ textwindows dontinstrument static uint32_t __sig_worker(void *arg) {
__maps_track((char *)(((uintptr_t)sp + __pagesize - 1) & -__pagesize) - STKSZ,
STKSZ);
for (;;) {
int sig;
if ((sig = __sig_getter(__sig.process, 0)))
// dequeue all pending signals and fire them off. if there's no
// thread that can handle them then __sig_generate will requeue
// those signals back to __sig.process; hence the need for xchg
unsigned long sigs =
atomic_exchange_explicit(__sig.process, 0, memory_order_acq_rel);
while (sigs) {
int sig = bsfl(sigs) + 1;
sigs &= ~(1ull << (sig - 1));
__sig_generate(sig, SI_KERNEL);
}
Sleep(1);
}
return 0;

5
libc/calls/sig.internal.h
View file

@ -2,6 +2,7 @@
#define COSMOPOLITAN_LIBC_CALLS_SIGNALS_INTERNAL_H_
#include "libc/atomic.h"
#include "libc/calls/struct/sigset.h"
#include "libc/nt/thunk/msabi.h"
#include "libc/thread/posixthread.internal.h"
#define SIG_HANDLED_NO_RESTART 1
@ -28,8 +29,8 @@ void __sig_delete(int);
void __sig_generate(int, int);
void __sig_init(void);
char16_t *__sig_process_path(char16_t *, uint32_t);
atomic_ulong *__sig_map_process(int, int);
__msabi char16_t *__sig_process_path(char16_t *, uint32_t, int);
__msabi atomic_ulong *__sig_map_process(int, int);
COSMOPOLITAN_C_END_
#endif /* COSMOPOLITAN_LIBC_CALLS_SIGNALS_INTERNAL_H_ */