// Copyright 2009 The Go Authors. All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

//go:build netbsd && (386 || amd64 || arm || arm64)

#include <sys/types.h>

#include <pthread.h>

#include <signal.h>

#include <string.h>

#include "libcgo.h"

#include "libcgo_unix.h"

static void* threadentry(void*);

static void (*setg_gcc)(void*);

void

x_cgo_init(G *g, void (*setg)(void*))

{

setg_gcc = setg;

_cgo_set_stacklo(g, NULL);

}

void

_cgo_sys_thread_start(ThreadStart *ts)

{

pthread_attr_t attr;

sigset_t ign, oset;

pthread_t p;

size_t size;

int err;

sigfillset(&ign);

pthread_sigmask(SIG_SETMASK, &ign, &oset);

pthread_attr_init(&attr);

pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);

pthread_attr_getstacksize(&attr, &size);

// Leave stacklo=0 and set stackhi=size; mstart will do the rest.

ts->g->stackhi = size;

err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);

pthread_sigmask(SIG_SETMASK, &oset, nil);

if (err != 0) {

fatalf("pthread_create failed: %s", strerror(err));

}

}

extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);

static void*

threadentry(void *v)

{

ThreadStart ts;

stack_t ss;

ts = *(ThreadStart*)v;

free(v);

// On NetBSD, a new thread inherits the signal stack of the

// creating thread. That confuses minit, so we remove that

// signal stack here before calling the regular mstart. It's

// a bit baroque to remove a signal stack here only to add one

// in minit, but it's a simple change that keeps NetBSD

// working like other OS's. At this point all signals are

// blocked, so there is no race.

memset(&ss, 0, sizeof ss);

ss.ss_flags = SS_DISABLE;

sigaltstack(&ss, nil);

crosscall1(ts.fn, setg_gcc, ts.g);

return nil;

}