1// Copyright 2018 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// This test source is used by both TestBigStackCallbackCgo (linked
6// directly into the Go binary) and TestBigStackCallbackSyscall
7// (compiled into a DLL).
8
9#include <windows.h>
10#include <stdio.h>
11
12#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
13#define STACK_SIZE_PARAM_IS_A_RESERVATION 0x00010000
14#endif
15
16typedef void callback(char*);
17
18// Allocate a stack that's much larger than the default.
19static const int STACK_SIZE = 16<<20;
20
21static callback *bigStackCallback;
22
23static void useStack(int bytes) {
24 // Windows doesn't like huge frames, so we grow the stack 64k at a time.
25 char x[64<<10];
26 if (bytes < sizeof x) {
27 bigStackCallback(x);
28 } else {
29 useStack(bytes - sizeof x);
30 }
31}
32
33static DWORD WINAPI threadEntry(LPVOID lpParam) {
34 useStack(STACK_SIZE - (128<<10));
35 return 0;
36}
37
38void bigStack(callback *cb) {
39 bigStackCallback = cb;
40 HANDLE hThread = CreateThread(NULL, STACK_SIZE, threadEntry, NULL, STACK_SIZE_PARAM_IS_A_RESERVATION, NULL);
41 if (hThread == NULL) {
42 fprintf(stderr, "CreateThread failed\n");
43 exit(1);
44 }
45 WaitForSingleObject(hThread, INFINITE);
46}
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