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Work around shutdown hang when compiling with SIMPLE_THREADS=1

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This is a workaround for a specific case of #508
This commit is contained in:
rdb 2019-08-12 19:37:11 +02:00
parent 932e981572
commit dc599901bc
3 changed files with 29 additions and 0 deletions
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17
panda/src/device/winInputDeviceManager.cxx
View File

@ -464,6 +464,23 @@ destroy_message_loop() {
}
}
/**
* Sends a signal to the thread input thread, asking it to shut itself down.
*/
void WinInputDeviceManager::
stop_thread() {
#ifdef HAVE_THREADS
WinInputDeviceManager *mgr = (WinInputDeviceManager *)_global_ptr;
if (mgr != nullptr) {
LightMutexHolder holder(mgr->_lock);
HWND hwnd = mgr->_message_hwnd;
if (hwnd) {
PostMessage(hwnd, WM_QUIT, 0, 0);
}
}
#endif
}
/**
* Implementation of the message loop.
*/

2
panda/src/device/winInputDeviceManager.h
View File

@ -44,6 +44,8 @@ public:
HWND setup_message_loop();
void destroy_message_loop();
static void stop_thread();
private:
// There are always exactly four of these in existence.
XInputDevice _xinput_device0;

10
panda/src/display/graphicsEngine.cxx
View File

@ -49,6 +49,10 @@
#include "callbackGraphicsWindow.h"
#include "depthTestAttrib.h"
#if defined(_WIN32) && defined(HAVE_THREADS) && defined(SIMPLE_THREADS)
#include "winInputDeviceManager.h"
#endif
#if defined(WIN32)
#define WINDOWS_LEAN_AND_MEAN
#include <WinSock2.h>
@ -637,6 +641,12 @@ remove_all_windows() {
PStatClient::get_global_pstats()->disconnect();
#endif
#if defined(_WIN32) && defined(HAVE_THREADS) && defined(SIMPLE_THREADS)
// Send a message to the input message pump asking it to shut itself down.
// If we don't do that, the next call will deadlock.
WinInputDeviceManager::stop_thread();
#endif
// Well, and why not clean up all threads here?
Thread::prepare_for_exit();
}