win: Capture some CRITICAL_SECTION debugging data

handler/win/crashy_test_program.cc

 // Copyright 2015 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 10 matching lines @@
 #endif
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "client/crashpad_client.h"
 #include "tools/tool_support.h"
 
 namespace crashpad {
 namespace {
 
+CRITICAL_SECTION g_test_critical_section;
+
 ULONG RtlNtStatusToDosError(NTSTATUS status) {
   static decltype(::RtlNtStatusToDosError)* rtl_nt_status_to_dos_error =
       reinterpret_cast<decltype(::RtlNtStatusToDosError)*>(
           GetProcAddress(LoadLibrary(L"ntdll.dll"), "RtlNtStatusToDosError"));
   DCHECK(rtl_nt_status_to_dos_error);
   return rtl_nt_status_to_dos_error(status);
 }
 
 void AllocateMemoryOfVariousProtections() {
   SYSTEM_INFO system_info;
@@ skipping 27 matching lines @@
   for (size_t i = 0; i < arraysize(kPageTypes); ++i) {
     void* result =
         VirtualAlloc(reinterpret_cast<void*>(reserve_as_int + (kPageSize * i)),
                      kPageSize,
                      MEM_COMMIT,
                      kPageTypes[i]);
     PCHECK(result) << "VirtualAlloc MEM_COMMIT " << i;
   }
 }
 
+BOOL CrashpadInitializeCriticalSectionEx(
+    CRITICAL_SECTION* critical_section,
+    DWORD spin_count,
+    DWORD flags) {
+  static decltype(InitializeCriticalSectionEx)* initialize_critical_section_ex =
+      reinterpret_cast<decltype(InitializeCriticalSectionEx)*>(GetProcAddress(
+          LoadLibrary(L"kernel32.dll"), "InitializeCriticalSectionEx"));
+  if (!initialize_critical_section_ex)
+    return false;
+  return initialize_critical_section_ex(critical_section, spin_count, flags);
+}
+
 void SomeCrashyFunction() {
   // SetLastError and NTSTATUS so that we have something to view in !gle in
   // windbg. RtlNtStatusToDosError() stores STATUS_NO_SUCH_FILE into the
   // LastStatusError of the TEB as a side-effect, and we'll be setting
   // ERROR_FILE_NOT_FOUND for GetLastError().
   SetLastError(RtlNtStatusToDosError(STATUS_NO_SUCH_FILE));
   volatile int* foo = reinterpret_cast<volatile int*>(7);
   *foo = 42;
 }
 
 int CrashyMain(int argc, char* argv[]) {
   if (argc != 2) {
     fprintf(stderr, "Usage: %s <server_pipe_name>\n", argv[0]);
     return 1;
   }
 
   CrashpadClient client;
   if (!client.SetHandler(argv[1])) {
     LOG(ERROR) << "SetHandler";
     return 1;
   }
   if (!client.UseHandler()) {
     LOG(ERROR) << "UseHandler";
     return 1;
   }
 
   AllocateMemoryOfVariousProtections();
 
+  CrashpadInitializeCriticalSectionEx(
+      &g_test_critical_section, 0, RTL_CRITICAL_SECTION_FLAG_FORCE_DEBUG_INFO);
+  EnterCriticalSection(&g_test_critical_section);
+
   SomeCrashyFunction();
 
   return 0;
 }
 
 }  // namespace
 }  // namespace crashpad
 
 int wmain(int argc, wchar_t* argv[]) {
   return crashpad::ToolSupport::Wmain(argc, argv, crashpad::CrashyMain);
 }