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c++ volatile multithreading variables


c++ volatile multithreading variables

By : user3849592
Date : October 22 2020, 11:12 AM
it fixes the issue C++ hasn't yet any provision for multithreading. In practice, volatile doesn't do what you mean (it has been designed for memory adressed hardware and while the two issues are similar they are different enough that volatile doesn't do the right thing -- note that volatile has been used in other language for usages in mt contexts).
So if you want to write an object in one thread and read it in another, you'll have to use synchronization features your implementation needs when it needs them. For the one I know of, volatile play no role in that.
code :


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.NET multithreading, volatile and memory model

.NET multithreading, volatile and memory model


By : jesper petersen
Date : March 29 2020, 07:55 AM
wish of those help In the .NET memory model, the runtime (CLI) will ensure that changes to volatile fields are not cached in registers, so a change on any thread is immediately seen on other threads (NB this is not true in other memory models, including Java's).
But this says nothing about the relative ordering of operations across multiple, volatile or not, fields.
volatile and multithreading?

volatile and multithreading?


By : user2179697
Date : March 29 2020, 07:55 AM
I hope this helps . Some perspective from the kernel kings:
http://kernel.org/doc/Documentation/volatile-considered-harmful.txt
Volatile and multithreading: is the following thread-safe?

Volatile and multithreading: is the following thread-safe?


By : user3265360
Date : March 29 2020, 07:55 AM
hop of those help? It is probably sort of thread-safe.
Thread safety tends to depend on context. Updating a bool is always thread safe, if you never read from it. And if you do read from it, then the answer depends on when you read from it, and what that read signifies.
Java volatile variables affecting memory consistency of other non-volatile variables

Java volatile variables affecting memory consistency of other non-volatile variables


By : ALİ AK
Date : March 29 2020, 07:55 AM
will help you Writing to a volatile variables does not guarantee to flush non-volatile variables1. However, it will introduce a "happens before" relation between the write to the volatile and any subsequent read of the volatile (assuming no intervening writes to it). You can exploit this as follows:
Thread A : write NV Thread A : write V Thread B : read V Thread B : read NV
Java Memory Model, volatile, and synchronized blocks accessing non-volatile variables

Java Memory Model, volatile, and synchronized blocks accessing non-volatile variables


By : user853421
Date : March 29 2020, 07:55 AM
like below fixes the issue The safety is defined by a transitive happens-before relationship as follows:
17.4.5. Happens-before Order
code :
List<SomeType> list = …;
synchronized(list) {
    list.set(1, new SomeType(…));
}
List<SomeType> myList = list.subList(1, 2);

synchronized(list) {
    SomeType value = myList.get(0);
    // process value
}
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