1 // Copyright 2009 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 <sys/types.h>
6 #include <errno.h>
7 #include <sys/signalvar.h>
8 #include <pthread.h>
9 #include <signal.h>
10 #include <string.h>
11 #include "libcgo.h"
12 #include "libcgo_unix.h"
13
14 static void* threadentry(void*);
15 static void (*setg_gcc)(void*);
16
17 void
x_cgo_init(G * g,void (* setg)(void *))18 x_cgo_init(G *g, void (*setg)(void*))
19 {
20 uintptr *pbounds;
21
22 // Deal with memory sanitizer/clang interaction.
23 // See gcc_linux_amd64.c for details.
24 setg_gcc = setg;
25 pbounds = (uintptr*)malloc(2 * sizeof(uintptr));
26 if (pbounds == NULL) {
27 fatalf("malloc failed: %s", strerror(errno));
28 }
29 _cgo_set_stacklo(g, pbounds);
30 free(pbounds);
31 }
32
33 void
_cgo_sys_thread_start(ThreadStart * ts)34 _cgo_sys_thread_start(ThreadStart *ts)
35 {
36 pthread_attr_t attr;
37 sigset_t ign, oset;
38 pthread_t p;
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 pthread_attr_getstacksize(&attr, &size);
47 // Leave stacklo=0 and set stackhi=size; mstart will do the rest.
48 ts->g->stackhi = size;
49 err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
50
51 pthread_sigmask(SIG_SETMASK, &oset, nil);
52
53 if (err != 0) {
54 fatalf("pthread_create failed: %s", strerror(err));
55 }
56 }
57
58 extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
59 static void*
threadentry(void * v)60 threadentry(void *v)
61 {
62 ThreadStart ts;
63
64 ts = *(ThreadStart*)v;
65 _cgo_tsan_acquire();
66 free(v);
67 _cgo_tsan_release();
68
69 crosscall1(ts.fn, setg_gcc, (void*)ts.g);
70 return nil;
71 }
72