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@A R Karthick: Logically, the entire cache is flushed on each write. This is important for the “safe publication” pattern – you can initialize some data structure and write a reference to it into a volatile field. Any readers who see the reference to the data structure are guaranteed to see its contents in a fully initialized state. Admittedly, I don’t fully understand all of the details in the hardware that make this guarantee happen.
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There are two reasons why a read of a non-volatile field may observe a stale value: compiler optimizations and processor optimizations.
I have a question I can’t seem to get answered; what happens with respect to [ThreadStatic] variables? It is my understanding that static variables marked with [ThreadStatic] could still suffer from the same mutlicore issues that volatile is meant to solve.
Definition of volatile in the Legal Dictionary ..
When you read a non-volatile field in C#, a non-volatile read occurs, and you may see a stale value from the thread’s cache. Or, you may see the updated value. Whether you see the old or the new value depends on your compiler and your processor.
volatile (computer programming) - Wikipedia
To understand how volatile and non-volatile memory accesses work, you can imagine each thread as having its own cache. Consider a simple example with a non-volatile memory location (i.e. a field) u, and a volatile memory location v.
Volatile Class .NET Framework ..
The first reason why a non-volatile read may return a stale value has to do with compiler optimizations. In the infinite loop example, the JIT compiler optimizes the while loop from this:
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Abusable Volatile Chemicals Program - Home
The memory model defines what state a thread may see when it reads a memory location modified by other threads. For example, if one thread updates a regular non-volatile field, it is possible that another thread reading the field will never observe the new value. This program never terminates (in a release build):
Volatile Organic Compound (VOC) Emissions from …
Are we talking the “thread” cache here or hardware cache. (ie. the whole L1, L2, L3 cache chain) Or more like a read through operation? (I guess not since that is weak volatile semantics as I understand you)