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Put more thought into i/o polyfills

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wait4() is now solid enough to run `make -j100` on Windows. You can now
use MSG_DONTWAIT on Windows. There was a handle leak in accept() that's
been fixed. Our WIN32 overlapped i/o code has been simplified. Priority
class now inherits into subprocesses, so the verynice command will work
and the signal mask will now be inherited by execve() and posix_spawn()
This commit is contained in:
Justine Tunney 2023-11-06 16:38:44 -08:00
parent 736fdb757a
commit e961385e55
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GPG key ID: BE714B4575D6E328
52 changed files with 679 additions and 487 deletions
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34
libc/calls/ucontext.c
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@ -17,17 +17,14 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/ucontext.h"
#include "libc/calls/struct/sigset.h"
#include "libc/runtime/runtime.h"
#include "libc/calls/struct/sigset.internal.h"
#include "libc/dce.h"
#include "libc/intrin/atomic.h"
#include "libc/sysv/consts/sig.h"
#include "libc/thread/tls.h"
int __tailcontext(const ucontext_t *);
static int __contextmask(const sigset_t *opt_set, sigset_t *opt_out_oldset) {
// now context switching needs to go 14x slower
return sigprocmask(SIG_SETMASK, opt_set, opt_out_oldset);
}
/**
* Sets machine context.
*
@ -37,14 +34,31 @@ static int __contextmask(const sigset_t *opt_set, sigset_t *opt_out_oldset) {
* @see getcontext()
*/
int setcontext(const ucontext_t *uc) {
if (__contextmask(&uc->uc_sigmask, 0)) return -1;
if (IsWindows()) {
atomic_store_explicit(&__get_tls()->tib_sigmask, uc->uc_sigmask,
memory_order_release);
} else {
sys_sigprocmask(SIG_SETMASK, &uc->uc_sigmask, 0);
}
return __tailcontext(uc);
}
int __getcontextsig(ucontext_t *uc) {
return __contextmask(0, &uc->uc_sigmask);
if (IsWindows()) {
uc->uc_sigmask =
atomic_load_explicit(&__get_tls()->tib_sigmask, memory_order_acquire);
return 0;
} else {
return sys_sigprocmask(SIG_SETMASK, 0, &uc->uc_sigmask);
}
}
int __swapcontextsig(ucontext_t *x, const ucontext_t *y) {
return __contextmask(&y->uc_sigmask, &x->uc_sigmask);
if (IsWindows()) {
x->uc_sigmask = atomic_exchange_explicit(
&__get_tls()->tib_sigmask, y->uc_sigmask, memory_order_acquire);
return 0;
} else {
return sys_sigprocmask(SIG_SETMASK, &y->uc_sigmask, &x->uc_sigmask);
}
}