panic | PANIC project aims to bring analysis
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kandi X-RAY | panic Summary
The PANIC project aims to bring analysis to bear on all publically leaked password lists, for the good of the community. More about the project is available here:
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QUESTION
I'm trying to understand best practices for Golang concurrency. I read O'Reilly's book on Go's concurrency and then came back to the Golang Codewalks, specifically this example:
https://golang.org/doc/codewalk/sharemem/
This is the code I was hoping to review with you in order to learn a little bit more about Go. My first impression is that this code is breaking some best practices. This is of course my (very) unexperienced opinion and I wanted to discuss and gain some insight on the process. This isn't about who's right or wrong, please be nice, I just want to share my views and get some feedback on them. Maybe this discussion will help other people see why I'm wrong and teach them something.
I'm fully aware that the purpose of this code is to teach beginners, not to be perfect code.
Issue 1 - No Goroutine cleanup logic
...ANSWER
Answered 2021-Jun-15 at 02:48It is the
mainmethod, so there is no need to cleanup. Whenmainreturns, the program exits. If this wasn't themain, then you would be correct.There is no best practice that fits all use cases. The code you show here is a very common pattern. The function creates a goroutine, and returns a channel so that others can communicate with that goroutine. There is no rule that governs how channels must be created. There is no way to terminate that goroutine though. One use case this pattern fits well is reading a large resultset from a database. The channel allows streaming data as it is read from the database. In that case usually there are other means of terminating the goroutine though, like passing a context.
Again, there are no hard rules on how channels should be created/closed. A channel can be left open, and it will be garbage collected when it is no longer used. If the use case demands so, the channel can be left open indefinitely, and the scenario you worry about will never happen.
QUESTION
I'm working on an aws/amazon-freertos project. In there I found some unusual error "A stack overflow in task iot_thread has been detected".
Many time I got this error and somehow I managed to remove it by changing the code.
I just want to know what this error means actually?
As per what I know, it simply means that the iot_thread ask stack size is not sufficient. So it's getting overflow.
Is this the only reason why this error comes or can there be another reason for this?
If yes then where should I increase the stack size of the iot_thread task?
Full Log:
...ANSWER
Answered 2021-Jun-14 at 22:05It simply means that the iot_thread ask stack size is not sufficient. [...] Is this the only reason why this error comes or can there be another reason for this?
Either it is insufficient you your stack usage is excessive (due to recursion error or instantiation of instantiation of large objects or arrays. Either way the cause is the same. Whether it is due insufficient stack or excessive stack usage is a matter of design an intent.
If yes then where should I increase the stack size of the iot_thread task?
The stack for a thread is assigned in the task creation function. For a dynamically allocated stack that would be the xTaskCreate() call usStackDepth parameter:
QUESTION
Hey, I am working on putting up a rocket rest api with a mongodb database.
I have been able to create a successful connection to the MongoDB Atlas and put the resulting client into the state management of rocket via the manage builder function like this:
ANSWER
Answered 2021-Jun-14 at 20:39This has been resolved. See above for the solution. It is marked with a header saying solution.
QUESTION
super newbie developer here. So say I have a variable (key) (i.e. type string) in golang that I want to send client-side (Vue js). I've tried sending it locally but Vue js isn't able to read it. So I'm 100% sure I'm doing it wrong within golang.
Would I need to POST it to a local server (ex: localhost:3001) and GET it from vue js? How should I send this POST request in go? Are there better options?
Snippet of current vue code :
...ANSWER
Answered 2021-Jun-13 at 12:31Without seeing exactly how your Go code is written it's difficult to fully understand what you're doing on that side, especially since you stated:
So I'm 100% sure I'm doing it wrong within golang
However, as an example to fill in the blank, I'm going to make the assumption you're doing something like so:
QUESTION
I would like to read a GRIB file downloaded from server using ecCodes library in Rust. However, my current solution results in segmentation fault. The extracted example, replicating the problem, is below.
I download the file using reqwest crate and get the response as Bytes1 using bytes(). To read the file with ecCodes I need to create a codes_handle using codes_grib_handle_new_from_file()2, which as argument requires *FILE usually get from fopen(). However, I would like to skip IO operations. So I figured I could use libc::fmemopen() to get *FILE from Bytes. But when I pass the *mut FILE from fmemopen() to codes_grib_handle_new_from_file() segmentation fault occurs.
I suspect the issue is when I get from Bytes a *mut c_void required by fmemopen(). I figured I can do this like that:
ANSWER
Answered 2021-Jun-12 at 13:291- Try changing
QUESTION
Given v = vec![1,2,3,4], why does v[4..] return an empty vector, but v[5..] panics, while both v[4] and v[5] panic? I suspect this has to do with the implementation of slicing without specifying either the start- or endpoint, but I couldn't find any information on this online.
ANSWER
Answered 2021-Feb-07 at 11:45This is simply because std::ops::RangeFrom is defined to be "bounded inclusively below".
A quick recap of all the plumbing: v[4..] desugars to std::ops::Index using 4.. (which parses as a std::ops::RangeFrom) as the parameter. std::ops::RangeFrom implements std::slice::SliceIndex and Vec has an implementation for std::ops::Index for any parameter that implements std::slice::SliceIndex. So what you are looking at is a RangeFrom being used to std::ops::Index the Vec.
std::ops::RangeFrom is defined to always be inclusive on the lower bound. For example [0..] will include the first element of the thing being indexed. If (in your case) the Vec is empty, then [0..] will be the empty slice. Notice: if the lower bound wasn't inclusive, there would be no way to slice an empty Vec at all without causing a panic, which would be cumbersome.
A simple way to think about it is "where the fence-post is put".
A v[0..] in a vec![0, 1, 2 ,3] is
QUESTION
this happens to me a lot of times, for example,
...ANSWER
Answered 2021-Jun-12 at 06:08it seems I need a way to turn self-owned reference to 'static lifetime.
That's what Rc is for. Define the struct as EmailTemplateMessageBuilder(Rc), and define translator as self.0.clone(). The clone() only clones the pointer and increases the reference count, so it's cheap. Finally, make the closure move, so it owns all captured data.
QUESTION
package main
import (
"fmt"
_ "github.com/jinzhu/gorm/dialects/postgres"
"gorm.io/driver/postgres"
"gorm.io/gorm"
)
type Books struct {
gorm.Model
ID uint
title string
author string
description string
display_picture byte
}
func main() {
dsn := //successful create connection string
db, err := gorm.Open(postgres.Open(dsn), &gorm.Config{})
if err != nil {
// fmt.Println(err)
panic(err)
}
b := Books{}
db.AutoMigrate(&b)
data := Books{
title: "Invisible Cities",
author: "Italio Calvino",
description: "This book shows you the power of prose. It's a beautiful read which will make you feel like you're floating on a cloud.",
}
db.Create(&data)
fmt.Println(data)
}
ANSWER
Answered 2021-Jun-10 at 13:27- Rewrite your code to this and always remember in Gorm we need to have Model Fields Capitalised
QUESTION
I'm cross compiling bare metal 32-bit code for x86 with Rust and I'm facing the problem, that the final object file is empty, if the entry function is not exactly called _start; the linker throws all code away because it sees it as dead. I'm familiar with the fact, that _start is a well-known entry point name, but the question is still:
What part in Rust, LLVM or Linker forces this? Also attributes like extern "C" fn ..., #[no_mangle] or #[export_name = "foobar"] do not work (get thrown away by the linker). My guess is, that it's not the Rust compiler but the linker. As you can see, I use rust-lld as linker and ld.lld as linker-flavor in my case (see below).
- Where does the required
_start-come from? Why does the linker throw my other code away? - Whats the best option to specify my custom entry point to the linker?
x86-unknown-bare_metal.json
...ANSWER
Answered 2021-Jun-10 at 12:17New Answer [Solution]
The real solution is quite simple but was hard to find, because it's hard to digg for possible options and solutions in this relatively undocumented field. I found out, that llvm-ld uses the same options, as GNU ld. So I checked against the GNU ld link options and found the solution. It has to be
QUESTION
As we know, xv6 doesn't let a spinlock be acquired twice (even by a process itself).
I am trying to add this feature which lets a process to acquire a lock more than once.
In order to reach this, I am adding an attribute called lock_holder_pid to the struct spinlock which is supposed to hold the pid of the process which has acquired this lock.
The only file I have changed is spinlock.c
Here is my new acquire() function:
ANSWER
Answered 2021-Jun-10 at 09:15This is simply because you are trying to have access to a field of a null struct (myproc()->pid).
As you may know, myproc() returns a process running on the current processor. If you look at main.c, you may notice that the bootstrap processor starts running there. Therefore, if we can find a function which calls the acquire() function before setting up the first process, the problem will be solved.
If you take a close look at the kinit1 function, you can realize that the acquire function is called in it. Consequently, we found a function that uses the acquire function, even before initializing the ptable struct. Therefore, when you try to access the myproc() value, it is not initialized yet.
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