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Implement signal handler tail recursion

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GNU Make on Windows now appears to be working reliably. This change also
fixes a bug where, after fork the Windows thread handle wasn't reset and
that caused undefined behavior using SetThreadContext() with our signals
This commit is contained in:
Justine Tunney 2023-10-14 10:29:26 -07:00
parent a657f3e878
commit cdf556e7d2
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GPG key ID: BE714B4575D6E328
15 changed files with 627 additions and 77 deletions
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10
libc/runtime/enable_tls.c
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@ -27,6 +27,7 @@
#include "libc/intrin/weaken.h"
#include "libc/macros.internal.h"
#include "libc/nt/files.h"
#include "libc/nt/process.h"
#include "libc/nt/runtime.h"
#include "libc/nt/synchronization.h"
#include "libc/nt/thread.h"
@ -191,10 +192,11 @@ textstartup void __enable_tls(void) {
tib->tib_locale = (intptr_t)&__c_dot_utf8_locale;
tib->tib_pthread = (pthread_t)&_pthread_static;
if (IsWindows()) {
intptr_t threadhand, pseudo = GetCurrentThread();
DuplicateHandle(GetCurrentProcess(), pseudo, GetCurrentProcess(),
&threadhand, 0, true, kNtDuplicateSameAccess);
atomic_store_explicit(&tib->tib_syshand, threadhand, memory_order_relaxed);
intptr_t hThread;
DuplicateHandle(GetCurrentProcess(), GetCurrentThread(),
GetCurrentProcess(), &hThread, 0, false,
kNtDuplicateSameAccess);
atomic_store_explicit(&tib->tib_syshand, hThread, memory_order_relaxed);
} else if (IsXnuSilicon()) {
tib->tib_syshand = __syslib->__pthread_self();
}