blob: 694116ce7098d64fb1e9e726ba4e899af1a3e81a [file] [log] [blame]
// Copyright 2019 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.
#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*);
x_cgo_init(G *g, void (*setg)(void*))
pthread_attr_t attr;
size_t size;
setg_gcc = setg;
pthread_attr_getstacksize(&attr, &size);
g->stacklo = (uintptr)&attr - size + 4096;
_cgo_sys_thread_start(ThreadStart *ts)
pthread_attr_t attr;
sigset_t ign, oset;
pthread_t p;
size_t size;
int err;
pthread_sigmask(SIG_SETMASK, &ign, &oset);
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) {
fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", 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;
// 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, (void*)ts.g);
return nil;