1 // Copyright 2023 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 "libcgo.h"
7 
8 void
x_cgo_getstackbound(uintptr bounds[2])9 x_cgo_getstackbound(uintptr bounds[2])
10 {
11 	void* addr;
12 	size_t size;
13 	pthread_t p;
14 
15 	p = pthread_self();
16 	addr = pthread_get_stackaddr_np(p); // high address (!)
17 	size = pthread_get_stacksize_np(p);
18 
19 	// bounds points into the Go stack. TSAN can't see the synchronization
20 	// in Go around stack reuse.
21 	_cgo_tsan_acquire();
22 	bounds[0] = (uintptr)addr - size;
23 	bounds[1] = (uintptr)addr;
24 	_cgo_tsan_release();
25 }
26