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// Copyright 2018 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.
// This test source is used by both TestBigStackCallbackCgo (linked
// directly into the Go binary) and TestBigStackCallbackSyscall
// (compiled into a DLL).
#include <windows.h>
#include <stdio.h>
#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
#define STACK_SIZE_PARAM_IS_A_RESERVATION 0x00010000
#endif
typedef void callback(char*);
// Allocate a stack that's much larger than the default.
static const int STACK_SIZE = 16<<20;
static callback *bigStackCallback;
static void useStack(int bytes) {
// Windows doesn't like huge frames, so we grow the stack 64k at a time.
char x[64<<10];
if (bytes < sizeof x) {
bigStackCallback(x);
} else {
useStack(bytes - sizeof x);
}
}
static DWORD WINAPI threadEntry(LPVOID lpParam) {
useStack(STACK_SIZE - (128<<10));
return 0;
}
void bigStack(callback *cb) {
bigStackCallback = cb;
HANDLE hThread = CreateThread(NULL, STACK_SIZE, threadEntry, NULL, STACK_SIZE_PARAM_IS_A_RESERVATION, NULL);
if (hThread == NULL) {
fprintf(stderr, "CreateThread failed\n");
exit(1);
}
WaitForSingleObject(hThread, INFINITE);
}