1// Copyright 2015 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5#include <pthread.h>
6#include <string.h>
7#include <signal.h>
8#include <ucontext.h>
9#include "libcgo.h"
10#include "libcgo_unix.h"
11
12static void* threadentry(void*);
13static void (*setg_gcc)(void*);
14
15void
16x_cgo_init(G *g, void (*setg)(void*))
17{
18	ucontext_t ctx;
19
20	setg_gcc = setg;
21	if (getcontext(&ctx) != 0)
22		perror("runtime/cgo: getcontext failed");
23	g->stacklo = (uintptr_t)ctx.uc_stack.ss_sp;
24
25	// Solaris processes report a tiny stack when run with "ulimit -s unlimited".
26	// Correct that as best we can: assume it's at least 1 MB.
27	// See golang.org/issue/12210.
28	if(ctx.uc_stack.ss_size < 1024*1024)
29		g->stacklo -= 1024*1024 - ctx.uc_stack.ss_size;
30}
31
32void
33_cgo_sys_thread_start(ThreadStart *ts)
34{
35	pthread_attr_t attr;
36	sigset_t ign, oset;
37	pthread_t p;
38	void *base;
39	size_t size;
40	int err;
41
42	sigfillset(&ign);
43	pthread_sigmask(SIG_SETMASK, &ign, &oset);
44
45	pthread_attr_init(&attr);
46
47	if (pthread_attr_getstack(&attr, &base, &size) != 0)
48		perror("runtime/cgo: pthread_attr_getstack failed");
49	if (size == 0) {
50		ts->g->stackhi = 2 << 20;
51		if (pthread_attr_setstack(&attr, NULL, ts->g->stackhi) != 0)
52			perror("runtime/cgo: pthread_attr_setstack failed");
53	} else {
54		ts->g->stackhi = size;
55	}
56	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
57	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
58
59	pthread_sigmask(SIG_SETMASK, &oset, nil);
60
61	if (err != 0) {
62		fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err));
63		abort();
64	}
65}
66
67static void*
68threadentry(void *v)
69{
70	ThreadStart ts;
71
72	ts = *(ThreadStart*)v;
73	free(v);
74
75	/*
76	 * Set specific keys.
77	 */
78	setg_gcc((void*)ts.g);
79
80	crosscall_amd64(ts.fn);
81	return nil;
82}
83