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// Copyright 2015 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 <pthread.h>
#include <string.h>
#include <signal.h>
#include <ucontext.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*))
{
ucontext_t ctx;
setg_gcc = setg;
if (getcontext(&ctx) != 0)
perror("runtime/cgo: getcontext failed");
g->stacklo = (uintptr_t)ctx.uc_stack.ss_sp;
// Solaris processes report a tiny stack when run with "ulimit -s unlimited".
// Correct that as best we can: assume it's at least 1 MB.
// See golang.org/issue/12210.
if(ctx.uc_stack.ss_size < 1024*1024)
g->stacklo -= 1024*1024 - ctx.uc_stack.ss_size;
// Sanity check the results now, rather than getting a
// morestack on g0 crash.
if (g->stacklo >= g->stackhi) {
fatalf("bad stack bounds: lo=%p hi=%p", (void*)(g->stacklo), (void*)(g->stackhi));
}
}
void
_cgo_sys_thread_start(ThreadStart *ts)
{
pthread_attr_t attr;
sigset_t ign, oset;
pthread_t p;
void *base;
size_t size;
int err;
sigfillset(&ign);
pthread_sigmask(SIG_SETMASK, &ign, &oset);
pthread_attr_init(&attr);
if (pthread_attr_getstack(&attr, &base, &size) != 0)
perror("runtime/cgo: pthread_attr_getstack failed");
if (size == 0) {
ts->g->stackhi = 2 << 20;
if (pthread_attr_setstack(&attr, NULL, ts->g->stackhi) != 0)
perror("runtime/cgo: pthread_attr_setstack failed");
} else {
ts->g->stackhi = size;
}
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
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;
ts = *(ThreadStart*)v;
free(v);
crosscall1(ts.fn, setg_gcc, (void*)ts.g);
return nil;
}