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// 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*);
void
x_cgo_init(G *g, void (*setg)(void*))
{
pthread_attr_t attr;
size_t size;
setg_gcc = setg;
pthread_attr_init(&attr);
pthread_attr_getstacksize(&attr, &size);
g->stacklo = (uintptr)&attr - size + 4096;
pthread_attr_destroy(&attr);
}
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_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));
abort();
}
}
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, (void*)ts.g);
return nil;
}
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