void
x_cgo_getstackbound(uintptr bounds[2])
{
	pthread_attr_t attr;
	void *addr;
	size_t size;

	// Needed before pthread_getattr_np, too, since before glibc 2.32
	// it did not call pthread_attr_init in all cases (see #65625).
	pthread_attr_init(&attr);
#if defined(__GLIBC__) || (defined(__sun) && !defined(__illumos__))
	// pthread_getattr_np is a GNU extension supported in glibc.
	// Solaris is not glibc but does support pthread_getattr_np

var tstart funcDescriptor

func newosproc(mp *m) {
	var (
		attr pthread_attr
		oset sigset
		tid  pthread
	)

	if pthread_attr_init(&attr) != 0 {
		throw("pthread_attr_init")
	}

	if pthread_attr_setstacksize(&attr, threadStackSize) != 0 {
		throw("pthread_attr_getstacksize")
	}

	if pthread_attr_setdetachstate(&attr, _PTHREAD_CREATE_DETACHED) != 0 {

#include <pthread.h>

void go_callback();
void go_callback2();

static void *thr(void *arg) {
    go_callback();
    return 0;
}

static void foo() {
    pthread_t th;
    pthread_attr_t attr;
    pthread_attr_init(&attr);
    pthread_attr_setstacksize(&attr, 256 << 10);
    pthread_create(&th, &attr, thr, 0);
    pthread_join(th, 0);
}

static void bar() {
    go_callback2();
}
*/
import "C"

import (

//
//go:nowritebarrier
func newosproc(mp *m) {
	var (
		attr pthreadattr
		oset sigset
		tid  pthread
		ret  int32
		size uint64
	)

	if pthread_attr_init(&attr) != 0 {
		throw("pthread_attr_init")
	}
	// Allocate a new 2MB stack.
	if pthread_attr_setstack(&attr, 0, 0x200000) != 0 {
		throw("pthread_attr_setstack")
	}
	// Read back the allocated stack.

	sigfillset(&ign);
	pthread_sigmask(SIG_SETMASK, &ign, &oset);

	// Start a thread to handle exceptions.
	uintptr_t port_set = (uintptr_t)mach_exception_handler_port_set;
	pthread_attr_init(&attr);
	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
	ret = _cgo_try_pthread_create(&thr, &attr, mach_exception_handler, (void*)port_set);

	pthread_sigmask(SIG_SETMASK, &oset, nil);

// and then call the underlying libc function.  They are defined in sys_darwin_$ARCH.s.

//go:nosplit
//go:cgo_unsafe_args
func pthread_attr_init(attr *pthreadattr) int32 {
	ret := libcCall(unsafe.Pointer(abi.FuncPCABI0(pthread_attr_init_trampoline)), unsafe.Pointer(&attr))
	KeepAlive(attr)
	return ret
}
func pthread_attr_init_trampoline()