Servlet 2.5 spec: Multiple servlets executing request threads may have active access to the same session object at the same time. The container must ensure that manipulation of internal data structures representing the session attributes is performed in a threadsafe manner. The Developer has the responsibility for threadsafe access to the attribute objects themselves. This … Read more
You are going to have a very hard time reproducing this bug. In fact, I would go as far as saying you will never be able to reproduce it using the .NET Framework. The reason is because Microsoft’s implementation uses a strong memory model for writes. That means writes are treated as if they were … Read more
Processes and Threads are different. The SharedPreferences implementation in Android is thread-safe but not process-safe. Normally your app will run all in the same process, but it’s possible for you to configure it in the AndroidManifest.xml so, say, the service runs in a separate process than, say, the activity. To verify the thready safety, see … Read more
That addOne function is indeed thread safe because it doesn’t access any data that could be accessed by another thread. Local variables cannot be shared among threads because each thread gets its own stack. You do have to make sure, however, that the function parameters are value types and not reference types. static void MyFunction(int … Read more
According to N2661, the paper that added <chrono>: This paper does not offer calendrical services except for a minimal mapping to and from C’s time_t. As this paper does not propose a date/time library, nor specify epochs, it also does not address leap seconds. However, a date/time library will find this to be an excellent … Read more
I believe that if each thread only works on a separate part of the array, all will be well. If you’re going to share data (i. e. communicate it between threads) then you’ll need some sort of memory barrier to avoid memory model issues. I believe that if you spawn a bunch of threads, each of … Read more
I know gettext and set_locale is not threadsafe. PHP should not be used with a threaded MPM. PHP Isn’t Thread-Safe Yet. Running PHP not threaded.
As Seth stated thread safe means that a method or class instance can be used by multiple threads at the same time without any problems occuring. Consider the following method: private int myInt = 0; public int AddOne() { int tmp = myInt; tmp = tmp + 1; myInt = tmp; return tmp; } Now … Read more
Without putting my brain fully into gear, from a quick scan of what you say it looks as though you need to intern() your Strings: final String firstkey = “Data-” + email; final String key = firstkey.intern(); Two Strings with the same value are otherwise not necessarily the same object. Note that this may introduce … Read more
I’m going to take a completely different approach here than the other answers and assume you actually want to learn how to write better thread-aware code, and are not looking for 3rd party suggestions from us (even though you may actually end up using one.) As others have said, you are creating a thread safe … Read more