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Avoid linking win32 signals impl

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This shaves ~4kb off o/tiny/examples/hello2.com by avoiding linking the
WIN32 signals polyfill unless sigaction() is being used.

See #965
This commit is contained in:
Justine Tunney 2023-11-29 04:09:31 -08:00
parent 2b960bb249
commit 70155df7a9
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GPG key ID: BE714B4575D6E328
8 changed files with 37 additions and 31 deletions
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11
libc/calls/park.c
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@ -19,6 +19,7 @@
#include "libc/calls/internal.h"
#include "libc/calls/sig.internal.h"
#include "libc/intrin/atomic.h"
#include "libc/intrin/weaken.h"
#include "libc/nt/synchronization.h"
#include "libc/sysv/consts/sicode.h"
#include "libc/sysv/errfuns.h"
@ -30,9 +31,11 @@
// raises ECANCELED if this POSIX thread was canceled in masked mode
static textwindows int _park_thread(uint32_t msdelay, sigset_t waitmask,
bool restartable) {
int sig;
int sig, handler_was_called;
if (_check_cancel() == -1) return -1;
if ((sig = __sig_get(waitmask))) goto HandleSignal;
if (_weaken(__sig_get) && (sig = _weaken(__sig_get)(waitmask))) {
goto HandleSignal;
}
int expect = 0;
atomic_int futex = 0;
struct PosixThread *pt = _pthread_self();
@ -40,9 +43,9 @@ static textwindows int _park_thread(uint32_t msdelay, sigset_t waitmask,
atomic_store_explicit(&pt->pt_blocker, &futex, memory_order_release);
bool32 ok = WaitOnAddress(&futex, &expect, sizeof(int), msdelay);
atomic_store_explicit(&pt->pt_blocker, 0, memory_order_release);
if (ok && (sig = __sig_get(waitmask))) {
if (ok && _weaken(__sig_get) && (sig = _weaken(__sig_get)(waitmask))) {
HandleSignal:
int handler_was_called = __sig_relay(sig, SI_KERNEL, waitmask);
handler_was_called = _weaken(__sig_relay)(sig, SI_KERNEL, waitmask);
if (_check_cancel() == -1) return -1;
if (!restartable || (handler_was_called & SIG_HANDLED_NO_RESTART)) {
return eintr();