WRK | Windows Research Kernel v1.2 contains | Game Engine library
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kandi X-RAY | WRK Summary
The Windows Research Kernel v1.2 contains the sources for the core of the Windows (NTOS) kernel and a build environment for a kernel that will run on x86 (Windows Server 2003 Service Pack 1) and AMD64 (Windows XP x64 Professional)
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QUESTION
I would like to share data (in the simplest case an array of integers) between C and Haskell using Haskell's FFI functionality. The C side creates the data (allocating memory accordingly), but never modifies it until it is freed, so I thought the following method would be "safe":
- After the data is created, the C function passes the length of the array and a pointer to its start.
- On the Haskell side, we create a
ForeignPtr, setting up a finalizer which calls a C function that frees the pointer. - We build a
Vectorusing that foreign pointer which can be (immutably) used in Haskell code.
However, using this approach causes rather non-deterministic crashes. Small examples tend to work, but "once the GC kicks in", I start to get various errors from segmentation faults to "barf"s at this or this line in the "evacuation" part of GHC's GC.
What am I doing wrong here? What would be the "right way" of doing something like this?
An ExampleI have a C header with the following declarations:
...ANSWER
Answered 2021-May-25 at 06:24Copied and extended from my earlier comment.
You may have a faulty cast or poke. One thing I make a point of doing, both as a defensive guideline and when debugging, is this:
Explicitly annotate the type of everything that can undermine types. That way, you always know what you’re getting. Even if a poke, castPtr, or unsafeCoerce has my intended type now, that may not be stable under code motion. And even if this doesn’t identify the issue, it can at least help think through it.
For example, I was once writing a null terminator into a byte buffer…which corrupted adjacent memory by writing beyond the end, because I was using '\NUL', which is not a char, but a Char—32 bits! The reason was that pokeByteOff is polymorphic: it has type (Storable a) => Ptr b -> Int -> a -> IO (), not … => Ptr a -> ….
This turned out to be the case in your code! Quoth @aclow:
The
createVectorgenerated by c2hs was equivalent to something likealloca $ \ ptr -> createCVector'_ ptr >> peek ptr, wherecreateCVector'_ :: Ptr () -> IO (), which meant thatallocaallocated only enough space to hold a unit. Changing the in-marshaller toalloca' f = alloca $ f . (castPtr :: Ptr ForeignVector -> Ptr ())seems to solve the issue.
Things that turned out not to be the case, but could’ve been:
I’ve encountered a similar crash when a closure was getting corrupted by somebody (read: me) writing beyond an array. If you’re doing any writes without bounds checking, it may be helpful to replace them with checked versions to see if you can get an exception rather than heap corruption. In a way this is what was happening here, except that the write was to the alloca-allocated region, not the array.
Alternatively, consider lifetime issues: whether the ForeignPtr could be getting dropped & freeing the buffer earlier than you expect, giving you a use-after-free. In a particularly frustrating case, I’ve had to use touchForeignPtr to keep a ForeignPtr alive for that reason.
QUESTION
Hello Everyone
I've got this array formula in excel and I want to merge it in a VBA code but it gives me an error of Unable to set the FormulaArray property of the Range class (Error 1004)
Here is the formula after i ammended it in the code
ANSWER
Answered 2021-May-02 at 14:10You'll need to replace the single quotes (') with double quotes (""). However, you'll need to double up on the quotes...
QUESTION
I have a json file, which I will read and based on the xyz details will create excel report. Below is the sample json file I will use to extract the information which holds data in format of multiple dictionaries.
Now my requirement is to fetch xyz value one by one and based on it using certain field create a report. Below is the small snippet of the code where I am reading the file and based on key populating results. The data I am referencing after reading it from a file.
...ANSWER
Answered 2021-Apr-14 at 18:58Once you get your json object, you can access each value using the key like so:
QUESTION
I'm trying to learn how to use python and i've always wanted to make my own discrod bot so I tried using discord.py but I added elif to make it so it's more optomized and so if no command goes through but the correct prefix is used then a help message goes through but I somehow have my elif syntax wrong heres my code the error is on line 33, and I use replit if that makes a diffence
...ANSWER
Answered 2021-Apr-15 at 00:30Barmar notified me I'm missing a ) on the line before that just posting it as an answer so I can mark this as resolved.
QUESTION
I have some Google Sheet that has an editable list of positions ('Items'!A1:A). I also have another table that writes data from a page created in Google Web Apps using the method. I need this to contain a with values from the range of the first sheets.
In one of the topics I found the following script:
...ANSWER
Answered 2021-Apr-11 at 12:22You could try using SpreadsheetApp.openById().
You can find the documentation for SpreadsheetApp here.
Please see the adapted code below:
QUESTION
I had following nginx configuration:
...ANSWER
Answered 2021-Apr-13 at 14:08nginx return directive works on rewrite phase, it immediately returns the result.
I believe ngx_http_limit_req_module works on access phase. So with return directive ngx_http_limit_req_module doesn't have any chances to be in game.
QUESTION
I have a database named library and it contains two tables named teacher and student. I have a JFrame named Signup and it contains various fields to signup.There is also a option to signup as "Teacher","Student" in a JComboBox.I can choose only one option and it will save in the selected database. means if i choice "Teacher" it will save in teacher table. I want to check Unique Username.But by clicking One JButton named REGISTER NOW How can I Check the Unique Username from the both table named teacher and student ? Means I select signup as teacher so I must check unique username from table teacher and if I select signup as student so I must check unique username from table student and show me if the username already exists in the table by clicking the button to register. My code is given below:
...ANSWER
Answered 2021-Mar-27 at 10:12You can for instance use UNION ALL to check in the username in both tables
QUESTION
Hi all this is my second day when i get stuck after hours and hours of google. I have one form and one class were the heavy code is, in the form i have some check boxes and textboxes, when the class program runs based of the checkboxex the code will run only part of code. But if i try to return a checkbox it only return false or if i try to textbox it only return blank eaven if i tick the textbox or if i add text to the textbox.
...ANSWER
Answered 2021-Mar-22 at 15:57In your Work class you are creating a new Form and therefore accessing it will not give you the values from your original form. One way to do this is to pass the form to your Work class like this:
QUESTION
I have two separate services, in different directories, configured for the same docker network.
Service PUB is a RabbitMQ publisher. Its docker-compose file starts service PUB and RabbitMQ.
Service WRK is a RabbitMQ worker. Its docker-compose file starts service WRK and RabbitMQ.
docker-compose up -d PUB will start PUB and RabbitMQ, but then running docker-compose up -d WKR will fail, as the RabbitMQ port is already allocated. Bind for 0.0.0.0:15672 failed: port is already allocated
However, docker-compose up -d WRK starts both WRK and RabbitMQ, if I haven't already started PUB.
How do I configure the docker-compose.yml files so that if RabbitMQ is already running, it doesn't attempt to start RabbitMQ and just connects to the existing instance?
docker-compose.yml for service PUB:
...ANSWER
Answered 2021-Mar-20 at 15:53Because you not use volumes in these compose files therefore they can be merged:
QUESTION
Issue: I have 100 tables that can have different column names for full name, date of birth, email and Id. For example: Table 1 has full name as Emp name,dob, work email and national id. Table 2 might have Full Nm, date of birth, Wrk Email, NID and Table 3 might have Full Name, birth date, Work Em, NatID and so on..for 10 or more different tables
Full Name + DOB is considered as unique column
What I need is a query or an automated way to pick those probable columns with different names and lookup those column values against a reference table which has those columns and its values (full name, date of birth, work email, national id) and if I found a match then
Desired result: I need to retrieve the table name that found a match, column name that found a match, value that matched and return "no match" if match not found
I tried using INFORMATION_SCHEMA.COLUMNS but had no luck yet. Any help would be appreciated
ANSWER
Answered 2021-Mar-17 at 20:07If its 10 tables then presumably you can check them out in advance and know which columns you want to look at. The challenge is then to combine all that into one query. You could do it with a bunch of UNIONS, like this:
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