demolished | TypeScript framework for realtime audio | Graphics library

I have a Windows fatal exception: code 0xc0000374 - yes there's multiprocessing (wait for the but...). Google says that the exception code 0xc0000374 indicates a heap corruption. Yes, multiprocessing is a must-have. It's apart of the framework I'm working in, as each bot has the potential to have its own core to run in. TL;DR I can't change the fact that there's multiprocessing. However, my bot only runs on one thread, so there shouldn't really be an issue, and in fact, this issue is relatively new.

I think I've found the problem, but it doesn't really make much sense. I'm extending Python with C in order to improve run times, and I think this is where the error is. I've narrowed it down to a function called ground_shot_is_viable, as when I comment it out in Python the error never happens. However, when I try print spamming (in this case I actually wrote to a file as that's more suitable for hundreds of prints) I found that the function successfully completed. I think the error is that the function oversteps it's memory boundaries, which corrupts a portion of data, causing the crash traceback to point elsewhere. (In this case, it's an innocent line in the framework I'm working with - File "G:\RLBotGUIX\venv\lib\site-packages\rlbot\utils\rendering\rendering_manager.py", line 104 in end_rendering which sets a variable to False)

I've also tested this for the other functions, and they don't cause this issue for some reason. There's a slight, small potential that it's because they don't get called as often as ground_shot_is_viable.

The error only happens after a few minutes which prob totals to at least a few hundred times, maybe a thousand. (The bot runs at upwards of 120tps, so the function has the potential to be called 120 times in a second.)

I only managed to get the traceback by setting the environment variable PYTHONFAULTHANLDER to 1 - when I didn't, my program just silently crashed.

I also didn't get a crash dump when I launched the program with python.exe, but with pythonw.exe I did get a crash dump.

Traceback:

I am trying to split a large number of strings in the following format into a list of dictionaries in python

1) Qianfeigong 钱妃宫 was originally called the Zhenhuimiao 贞惠庙, and later the Qianlinggong 钱灵宫. The temple was built during the Northern Song in Yuanfeng 7 (1083). The temple was renovated during the early Ming. In 1967 the temple was demolished, but it was rebuilt in 1985. The main god is Qianshi shengfei 钱氏圣妃. Secondary gods are Guangping Zhouwang 广平周王 and Taishan Kongwang 泰山孔王. The stone inscription composed in the Xianchun period (1265–1274) by Liu Kezhuang 刘克庄 entitled 协应钱夫人庙记 (Record of the Temple to Lady Qian of Beneficial Assistance) (Epigraphical Materials, 1995:54, No. 48) is about this temple (stele no longer extant). 2) Xinglongshê 兴隆社: The main gods are Zunzhu mingwang 尊主明王 and Houtu furen 后土夫人.

I tried the following, but it broke the string along "48)" too.

re.split("\d+)", string)

Results: 1), 48), 2)

48) should not be a result.

I was thinking about excluding results that follow an openning bracket "(", but I am unsure how to go about that.

I have a conundrum. The part I am using (NXP KL27, Cortex-M0+) has an errata in its I2C peripheral such that during receive there is no flow control. As a result, it needs to be a high priority interrupt. I am also using a UART that, by its asynchronous nature, has no flow control on its receive. As a result, it needs to be a high priority interrupt.

Circular Priority

The I2C interrupt needs to be higher priority than the UART interrupt, otherwise an incoming byte can get demolished in the shift register before being read. It really shouldn't work this way, but that's the errata, and so it needs to be higher priority.

The UART interrupt needs to be higher priority than the I2C interrupt, because to close out an I2C transaction the driver (from NXP's KSDK) needs to set a flag and wait for a status bit. During this wait incoming characters on the UART can overflow the non-FIFO'd shift register.

In trying to solve an issue with the UART, I discovered this circular dependency. The initial issue saw characters disappearing from the UART receive and the overrun flag being set. When swapping priorities, the UART was rock solid, never missing a character, but I2C transactions ended up stalling due to overruns.

Possible Solution

The solution I came up with involves changing interrupt priorities on the fly. When the I2C driver is closing out a transaction, it is not receiving, which means the errata that causes bytes to flow in uncontrolled is not an issue. I would like to demote the I2C interrupt priority in the NVIC during this time so that the UART is able to take priority over it, thus making the UART happy (and not missing any characters).

Question

I haven't been able to find anything from ARM that states whether changing the interrupt priority while executing that interrupt will take effect immediately, or if the priority of the current interrupt was latched in when it started executing. I am hoping someone can definitely save from the depths of their knowledge of the architecture or from experience that changing the priority will take effect immediately, or not.

Other Possible Solutions

There are a number of other possible solutions and reasons why they are undesirable. Refactoring the I2C driver to handle the loop in the process context rather than interrupt context would be a significant effort digging into the vendor code and affects the application code that calls into it. Using DMA for either of these peripherals uses up a non-trivial amount of the DMA channels available and incurs the overhead of setting up DMA for each transaction (and also affects the application code that calls into the drivers).

I am open to other solutions, but hesitant to go down any path that causes significant changes to the vendor code.

Test

I have an idea for an experiment to test how the NVIC works in this regard, but I thought I would check here first. If I get to the experiment, I will post a follow-up answer with the results.

I am trying to build a simple tool and stumbled with adding rows. This is my reprex.

My data

I have a create function that I want to pass a function pointer, however I want the function pointer to be able to call either of the functions below the problem that I am having is that each one return a different type. But when I pass the function pointer I have to specify the return type of the function pointer. Is this correct? I thought using a void pointer in the would solve the return type problem, but now I can't call the function pointer. To clarify I want to pass either populateMonsters or populateClassesTaken into create and be able to call them within create.

So I am trying to use a pointer to a struct of MonsterAttacks as the data that belongs to an element of a linked list. In order to do this I try to populate a struct of MonsterAttacks and then pass that along with a null ptr to a next node to a function called create. However somewhere in the populate method a segmentation fault error occurs. I am working with three files list_demo.c, linked_list.h and linked_list.c. I will build all the the functions that make up a fully functioning linked list, well hoping I can as soon as I get pass this error. Been dealing with this error for about two days and I showed my professor and he could not figure out why its happening, it seems to come from the populate function. I have tried to return a pointer to a strut in which case I get a bus error, and I have tried almost every variation of getting input and storing it on the strut. I even deleted the function and tried to populate it in main, but nothing works. I am new to C and my professor helped me out for about an hour debug this problem and he finally gave up, so any help would be appreciated.

list_demo.c

here's the problem: I have to create a program that simulates a city, in particular its buildings, to determinate the average height of its skyline and other values. My problem is choosing data structure: I need something that let me to calculate this values over different years: for example the user could ask for the skyline value in the 2016 and then for the highest building in 2020.

Each building has a String as a key, but once they are demolished, that same key is available again.

This is a project for University, so I'm asking just for a tip; I need to know more "what" and "why" than "how".

I use Java.

Thanks.

I am trying to learn and understand multiple inheritance.

I have a 'squat' class that is a child of an 'abandoned' class

Why am I getting the error message no matching function for call to Abandoned::Abandoned()

squatter.cpp|9|error: no matching function for call to 'Abandoned::Abandoned()'|

I have looked at a lot of similar posts on this website relating to this topic. They say they I must declare an object of Abandoned with the right arguments, but I am not trying to use any functions from Abandoned, I only want to link it squat for now.

I think it is something to do with my constructor but I can't work out what the problem is.

Sorry for the big wall of code but I couldn't think of a better way

Here is my squat .cpp/h

I have a collection of Buildings in my database. Up to this point, all buildings I've needed to track have been active, so to speak. A need has now arisen, though, to include a building that has been demolished and no longer exists. It seems fairly sensible to add a nullable DateTime property called Decommissioned to the Building class to track when a building has been taken offline.

The vast majority of my application fetches buildings by simply getting the entire set of all buildings from the DbContext. It would be a pain to add an additional dbcontext.Buildings.Where(b => b.Decommissioned == null) check to every instance, so filtering at the IDbSet level would be nice, but I still need these decommissioned buildings to show up in some contexts, like pulling up a resident's history of tenancies.

The question largely boils down to, how can I have the default behavior of dbContext.Buildings be to get me only non-decommissioned buildings, but still ask the DB in a special way to specifically include decommissioned buildings when I do want them?