logo
down
shadow

MULTITHREADING QUESTIONS

How to prevent threads to visually mix up each others' output?
How to prevent threads to visually mix up each others' output?
Does that help As we mentioned in the comment section above, you very likely want to use an external library to deal with the intrinsic of each terminal.However, unlike discussed above, you may not even need tui for such a simple "UI", you could get
TAG : multithreading
Date : January 08 2021, 03:18 AM , By : rusl
Overridden virtual function not called from thread
Overridden virtual function not called from thread
wish of those help Your program exhibits undefined behavior. There's a race on *this between thread_func and C's (implicitly defined) constructor.
TAG : multithreading
Date : January 07 2021, 07:50 AM , By : Marie Ramos
Proper way to optimize multi-threading with WaitGroups and goroutines?
Proper way to optimize multi-threading with WaitGroups and goroutines?
should help you out I would not use a global sync.WaitGroup, it is hard to understand what is happening. Instead, just define it wherever you need.You are calling wg.Wait() inside the loop block. That is basically blocking the loop every iteration wa
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : Andrew Bailey
Is there a way to make this text game in haskell using MVar?
Is there a way to make this text game in haskell using MVar?
I think the issue was by ths following , There are a number of problems with your code before it'll even compile: damageCalculation tries to use life as both an MVar Integer (i.e., a "token" for a storage location containing an Integer) and the Integ
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : John R
How can i use MVars to move paddles on my pingpong haskell game?
How can i use MVars to move paddles on my pingpong haskell game?
should help you out The way MVars work is that a value of type MVar Bool is an opaque "token" referencing a storage location for a Bool. You create such a token and read and modify the contents of its associated storage location using IO actions.The
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : Dean
Concurrent (multithreaded) program hangs unless I print something
Concurrent (multithreaded) program hangs unless I print something
should help you out Despite the text in your question, I recommend that you let watcher block. It is quite rare indeed to need non-blocking operations on MVars; usually wanting it is a sign you haven't quite internalized the "fork everything" mentali
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : Cowtung
How to reason the correctness of mutex composition?
How to reason the correctness of mutex composition?
I think the issue was by ths following , Running your code a bunch of times and hoping for some arbitrary interleaving to uncover a concurrency-related bug is not a great way to do things but it's useful for some initial testing. Otherwise, there are
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : s8k
Optimally traverse a DAG with weighted vertices in parallel
Optimally traverse a DAG with weighted vertices in parallel
will be helpful for those in need You can model this problem as a job shop scheduling problem (flexible job shop problem in particular, where the machines are processors, and the jobs are slices of programs to be run).First, you have to modify a bit
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : 小和尚
Moving files between S3 buckets in parallel
Moving files between S3 buckets in parallel
this one helps. If the two buckets are in different regions, you can use Amazon S3 Cross-Region Replication.If they are in the same region, the "fastest" way to get the objects copied is:
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : Ben Kohn
Why does false sharing in caches not lead to wrong results?
Why does false sharing in caches not lead to wrong results?
wish help you to fix your issue You should look into cache coherency protocols such as MESI and its extensions MOESI and MESIF. In these protocols, each cacheline is essentially a state machine, transitioning from one state to the next based on what
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : AnToni00
Questions about implementation of worker tasks controlled by single master task
Questions about implementation of worker tasks controlled by single master task
hope this fix your issue You are correct that the master task can call the Do_Work entry for each worker task. Similarly, the master task can call the Report_Result entry of all worker tasks. A simple way to accomplish this is to create a task type f
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : lietkynes
Vulkan - when do we need to use more than one logical device (when there is only one physical device)?
Vulkan - when do we need to use more than one logical device (when there is only one physical device)?
Does that help The concept of a logical device needs to be distinct from a physical device, because you need to be able to register extensions, features, queue counts, and other initialization-time constructs. You need to be able to ask what the phys
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : Jorge Palacio
Threads running inside a child process are not timing out as per the set alarm time
Threads running inside a child process are not timing out as per the set alarm time
I wish did fix the issue. The timing of alarm() is not guaranteed to have sub-second accuracy. The standard Time::HiRes module offers ualarm() and a re-implementation of alarm() in terms of ualarm() which may be closer to what you want. Solving your
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : Eugenio
no multithreading benefit with single core
no multithreading benefit with single core
I wish did fix the issue. I'm new to concurrrent programming and multithreading. I can understand the benefits of multithreading with multicore processors, but does those benefit exist on single core processor, , There are two primary benefits to mul
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : Francesco
How can I wrap this Powershell cmdlet into a timeout function?
How can I wrap this Powershell cmdlet into a timeout function?
this one helps. A couple things...Having a timeout doesn't necessitate async processing. You could have a sync process (like your example) that has a timeout.
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : user183442
Is texture name unique in OpenGL?
Is texture name unique in OpenGL?
around this issue Texture object names are numbers that represent a specific texture. If you generate a texture object name, the system guarantees that it will uniquely identify that specific texture within that OpenGL context, until you delete the t
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : arbeitandy
what happen to the spawned process if the module who spawns it dies?
what happen to the spawned process if the module who spawns it dies?
Does that help Modules don't go down. Processes do. Modules could be purged out from the memory if you have more then one new version loaded up and then all processes which run the old version will be killed but it is not what you asked. Modules don'
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : Kaputnik
groovy multithreading
groovy multithreading
will be helpful for those in need I would take a look at the Groovy Parallel Systems library. In particular I think that the Parallel collections section would be useful. Looking at the docs, I believe that collectParallel is a direct drop-in replace
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : phil
Is Work Stealing always the most appropriate user-level thread scheduling algorithm?
Is Work Stealing always the most appropriate user-level thread scheduling algorithm?
To fix the issue you can do I'd distribute the tasks upfront. With the information of their estimated running time you can distribute them into individual queues, for each thread one.Distributing the tasks is basically the knapsack problem, each queu
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : user157138
Is the FPU control word setting per-thread or per-process?
Is the FPU control word setting per-thread or per-process?
I hope this helps you . It is per-thread on Windows. Not sure about OS-X, surely it does. Beware the nastiness you can run into if you are using libraries that expect the control word to be set at the default. Almost all of them do.
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : CrookedNumber
Clojure best way to achieve multiple threads?
Clojure best way to achieve multiple threads?
I wish did fix the issue. I am working on a MUD client written in Clojure. Right now, I need two different threads. One which receives input from the user and sends it out to the MUD (via a simple Socket), and one that reads and displays output from
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : Frank Bradley
Java fatal error, don't know what it means
Java fatal error, don't know what it means
wish help you to fix your issue It happens at the same place in my code (albeit not the first time the method is executed) but I can't make head or tail of what is wrong. (Doubly so as it's code for a robot). , The following error:
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : mobi phil
How to run background task in Outlook 2007 add-in efficiently?
How to run background task in Outlook 2007 add-in efficiently?
I hope this helps . Running background threads in out are not recomended, it can be done but it depends on what you are actualy doing in your code, The OOM is run in a single threaded apartment COM server, so every COM call is executed on the main th
TAG : multithreading
Date : January 02 2021, 06:48 AM , By : user96271
Producer Consumer synchronization with only 1 semaphore
Producer Consumer synchronization with only 1 semaphore
this will help The "standard solution" doesn't have to use 3 semaphores. Even the wikipedia article you linked has a two-semaphore solution for cases in which there's a single producer and a single consumer:
TAG : multithreading
Date : January 01 2021, 06:46 AM , By : Daniel Reslie
Runtime Thread Access Violation Errors
Runtime Thread Access Violation Errors
wish helps you I solved the problem by replacing the dbgrid component with the listview component
TAG : multithreading
Date : December 27 2020, 03:57 PM , By : user119985
Make use of all CPUs on SLURM
Make use of all CPUs on SLURM
I think the issue was by ths following , One dirty hack to achieve the objective is using the environment variables provided by the SLURM. For a sample sbatch file:
TAG : multithreading
Date : December 27 2020, 03:57 PM , By : Ernie
Vulkan Compute dispatch from a child CPU thread
Vulkan Compute dispatch from a child CPU thread
To fix the issue you can do It depends on what you mean by "dispatch" and "main thread".vkCmdDispatch, as the "Cmd" prefix suggests, puts a command in a command buffer. This can be called on any thread, so long as the VkCommandBuffer object will not
TAG : multithreading
Date : December 25 2020, 04:01 PM , By : JoeCh
Why threads implemented in kernel space are slow?
Why threads implemented in kernel space are slow?
will be helpful for those in need Threads implemented as a library package in user space perform significantly better. Why?
TAG : multithreading
Date : December 21 2020, 06:30 PM , By : Ruchi
Why is the race detector not detecting this race condition?
Why is the race detector not detecting this race condition?
I wish did fix the issue. There is nothing racy in your code, so that's why the race detector detects nothing. Your counter variable is always accessed via the atomic package from the launched goroutines and not directly.The reason why sometimes you
TAG : multithreading
Date : December 05 2020, 06:54 AM , By : JSebok
Compile error when try to create singleton using shared_ptr
Compile error when try to create singleton using shared_ptr
fixed the issue. Will look into that further The conversion fails because your ThreadPool class has a private destructor.Calling .reset(ptr) will use the delete expression (delete ptr;) as the deleter, which requires that the destructor be public.
TAG : multithreading
Date : December 01 2020, 04:36 PM , By : nhuser
How to implement Sync for RustBox?
How to implement Sync for RustBox?
I hope this helps . RustBox doesn't implement Send, so there is no (safe) way to share it between threads (it seems you already found the not yet merged pull request https://github.com/gchp/rustbox/pull/65 which would support Send).If the pull reques
TAG : multithreading
Date : November 29 2020, 03:01 PM , By : Liy
Clojure async/go how to park blocking code
Clojure async/go how to park blocking code
I think the issue was by ths following , This is where you use clojure.core.async/pipeline-blocking
TAG : multithreading
Date : November 28 2020, 03:01 PM , By : Dean
Why is a immutable pointer to a static immutable variable not Sync?
Why is a immutable pointer to a static immutable variable not Sync?
help you fix your problem The chapter Send and Sync in The Rustonomicon describes what it means for a type to be Send or Sync. It mentions that: raw pointers are neither Send nor Sync (because they have no safety guards).
TAG : multithreading
Date : November 28 2020, 09:01 AM , By : user87752
Marshalling call to main thread from System.Timers.Timer
Marshalling call to main thread from System.Timers.Timer
fixed the issue. Will look into that further I have a tough question (for me at least). I'm working on a Windows Service written in VB.net. I'm using a System.Timers.Timer class to periodically call a delegate method to see if there is any work to do
TAG : multithreading
Date : November 28 2020, 01:01 AM , By : dummyadresse
Why two threads within the same process cannot run simultaneously on two processors?
Why two threads within the same process cannot run simultaneously on two processors?
wish helps you In the article you link to, it lists this as a limitation of user-level threads (that are implemented by an application itself, without being backed by OS-level threads).That's correct, but it does not apply to "real" threads. The OS i
TAG : multithreading
Date : November 27 2020, 09:01 AM , By : ThF
Perl Tk error "Invalid value for shared scalar"
Perl Tk error "Invalid value for shared scalar"
around this issue That error suggests that Tk Label objects simply weren't written to support being shared under ithreads, a circumstance which I'd guess is very arduous to remedy.I'd suggest instead you make a thread responsible for updating the UI
TAG : multithreading
Date : November 24 2020, 05:44 AM , By : Erik
Why is there a deadlock in my code even after closing the channel and all workers quitting?
Why is there a deadlock in my code even after closing the channel and all workers quitting?
I hope this helps . Here is my code: , From the docs:
TAG : multithreading
Date : November 23 2020, 04:01 AM , By : Hugo Hernan Buitrago
Starvation with upgrade_lock
Starvation with upgrade_lock
it fixes the issue This is a subtle one. The difference involves the concepts of shared and upgradable ownerships, and their implementations in Boost.Let's first get the concepts of shared ownership and upgradable ownership sorted out. For a SharedLo
TAG : multithreading
Date : November 22 2020, 11:05 AM , By : Ryan Adriano
JMeter: What is the purpose of tearDown Thread Group
JMeter: What is the purpose of tearDown Thread Group
it fixes the issue As per help given by JMeter Tear Down Threadgroup,
TAG : multithreading
Date : November 22 2020, 10:54 AM , By : Nougat
RobotC: Multithreading in TeleOp (controlling mode)
RobotC: Multithreading in TeleOp (controlling mode)
I hope this helps you . Since this is Controller Mode, I'm assuming that you are setting the motors to stop when the corresponding button is not pressed.
TAG : multithreading
Date : November 22 2020, 10:54 AM , By : sam
Ocamldoc "Unbound module Thread" without ocamlfind
Ocamldoc "Unbound module Thread" without ocamlfind
To fix the issue you can do -thread or -package aren't supported by ocamldoc, and -I -thread doesn't work.
TAG : multithreading
Date : November 22 2020, 10:38 AM , By : keird
General Strategies for Profiling Simultaneous Asynchronous Requests
General Strategies for Profiling Simultaneous Asynchronous Requests
seems to work fine I don't know of any profiler that will be useful for this. That doesn't mean they don't exist.I have faced this kind of problem before. I wrote a book, and discussed this in it. Basically I came up with two methods, one that works
TAG : multithreading
Date : November 22 2020, 01:01 AM , By : user155548
The "this" pointer and message receiving in D
The "this" pointer and message receiving in D
I wish this helpful for you Looks like a bug. What happens is bar gets you a pointer to the method WITHOUT this which has type as a function pointer:
TAG : multithreading
Date : November 20 2020, 12:01 PM , By : zdyne
Is there a way to determine if processor stuck when run with concurrentConsumers?
Is there a way to determine if processor stuck when run with concurrentConsumers?
may help you . You can see the inflight repository, and as well the await manager mbean [1]. The latter can tell you how many threads are blocked waiting for some external condition to trigger before continuing. You can use hawtio [2] web console to
TAG : multithreading
Date : November 20 2020, 09:01 AM , By : Ryan Adriano
Concurrent File access in D
Concurrent File access in D
To fix this issue easier is to spawn another thread and pass messages to it when you want to log
TAG : multithreading
Date : November 19 2020, 12:01 PM , By : Vijayant Singh
Global Temporary Table
Global Temporary Table
I wish this help you Oracle Temp tables are NOT like SQL Server temp tables. I can't see any reason to continuously drop/create the tables. The data is gone on a per session basis anyways once the transaction or session is completed (depends on table
TAG : multithreading
Date : November 17 2020, 04:28 AM , By : user185144
How to Destroy a thread object
How to Destroy a thread object
it fixes the issue You don't have to do anything special.std::thread gets a callable as a parameter in its constructor and that callable is the function the thread runs.
TAG : multithreading
Date : November 12 2020, 03:00 PM , By : TC.
c++11 compile failed due to issues with templates and thread
c++11 compile failed due to issues with templates and thread
it fixes the issue I am trying to create a new thread by following this tutorial http://www.cplusplus.com/reference/thread/thread/ , You want:
TAG : multithreading
Date : November 07 2020, 03:01 PM , By : Big Ant
Golang HTTP request worker pool
Golang HTTP request worker pool
help you fix your problem One thing up front: If you are running an HTTP server (Go's standard server anyway), you cannot control the number of goroutines without stopping and restarting the server. Each request starts at least one goroutine, and the
TAG : multithreading
Date : November 07 2020, 03:01 PM , By : Santhanam
How does PostgreSQL handle temp table ON COMMIT DROP in the face of multiple threads?
How does PostgreSQL handle temp table ON COMMIT DROP in the face of multiple threads?
I think the issue was by ths following , Postgres (server) knows nothing about client threads. It sees a session as a consecutive series of commands grouped in transactions. From the server's point of view concurrency inside a session is impossible.
TAG : multithreading
Date : November 05 2020, 03:01 PM , By : CM.
Read-write lock in Perl
Read-write lock in Perl
seems to work fine The flock won't do what you want across threads. You can implement your own locking using sysopen, which fails if the file exists when used with O_EXCL|O_CREAT.
TAG : multithreading
Date : November 05 2020, 03:01 PM , By : Tim Benninghoff
Thread in ready state consumes CPU
Thread in ready state consumes CPU
hope this fix your issue The threads that are ready were in a running state when they consumed the CPU. Given the very similar CPU values, I'll bet that all of those threads are always either ready to run or running.
TAG : multithreading
Date : November 01 2020, 01:03 PM , By : Sandeep Arneja
Are same lenght loop guaranteed to be separated the same way among OpenMP threads
Are same lenght loop guaranteed to be separated the same way among OpenMP threads
Hope that helps If certain conditions are met, then yes (OpenMP specification, Section 2.7.1 Loop Construct):
TAG : multithreading
Date : November 01 2020, 12:01 AM , By : user116330
C++ thread issue with data copy
C++ thread issue with data copy
around this issue Your first "task" is copied once when you pass it into the std::thread constructor, and copied again when it's sent to the actual worker thread.Neither of your other tasks are ever copied anywhere — all you do there is copy pointers
TAG : multithreading
Date : November 01 2020, 12:01 AM , By : user93312
Parallel execution of computationally expensive map
Parallel execution of computationally expensive map
wish help you to fix your issue Yep, there is a way to do this. I would buffer the stream into chunks and distribute the load across cpus using Schedulers.computation() (which uses an Executor based on a thread pool with size equal to the number of a
TAG : multithreading
Date : October 31 2020, 01:52 PM , By : wiznick
Scala Future concurrency Issue
Scala Future concurrency Issue
this will help Finally I was able to figure out the issue.The issue is certianly because of Thread Pool was not terminated even after my futures were completed successfully . I tried to isolate the issue by changing my implementation slightly as belo
TAG : multithreading
Date : October 31 2020, 09:54 AM , By : user171555
Python3.4 A quest about create mul-threads
Python3.4 A quest about create mul-threads
it fixes the issue look at this code:
TAG : multithreading
Date : October 30 2020, 12:01 AM , By : Bjørn Lyngwa
Single-threaded/event-based software vs cores and H/W threads
Single-threaded/event-based software vs cores and H/W threads
I think the issue was by ths following , No, the CPU you linked to has four cores. It can, however, run two threads at the same time per core with a technology called Hyper-Threading (HT), thus has 8 "threads". The OS will be presented with 8 process
TAG : multithreading
Date : October 28 2020, 05:11 PM , By : Robert Daniel Pickar
How to store a value from firebase in a global variable?
How to store a value from firebase in a global variable?
it helps some times There is no way in which you can store a value that you get from a Firebase database in global variable because the onDataChange() method is called asynchronous. This means that setText() method is called before you are trying to
TAG : multithreading
Date : October 28 2020, 04:01 PM , By : Chris Lomax
Atomic UPDATE to increment integer in Postgresql
Atomic UPDATE to increment integer in Postgresql
Hope this helps Yes, that is safe.While one such statement is running, all other such statements are blocked on a lock. The lock will be released when the transaction completes, so keep your transactions short. On the other hand, you need to keep you
TAG : multithreading
Date : October 24 2020, 01:32 PM , By : cthulhup

shadow
Privacy Policy - Terms - Contact Us © scrbit.com