multithreading

问题 I've been reading about the requirement that if OpenSSL is used in a multi-threaded application, you have to register a thread identification function (and also a mutex creation function) with OpenSSL. On Linux, according to the example provided by OpenSSL, a thread is normally identified by registering a function like this: static unsigned long id_function(void){ return (unsigned long)pthread_self(); } pthread_self() returns a pthread_t, and this works on Linux since pthread_t is just a

问题 I know that Thread.Sleep blocks a thread. But does Task.Delay also block? Or is it just like Timer which uses one thread for all callbacks (when not overlapping)? (this question doesn't cover the differences) 回答1: The documentation on MSDN is disappointing, but decompiling Task.Delay using Reflector gives more information: public static Task Delay(int millisecondsDelay, CancellationToken cancellationToken) { if (millisecondsDelay < -1) { throw new ArgumentOutOfRangeException(

问题 I know that Thread.Sleep blocks a thread. But does Task.Delay also block? Or is it just like Timer which uses one thread for all callbacks (when not overlapping)? (this question doesn't cover the differences) 回答1: The documentation on MSDN is disappointing, but decompiling Task.Delay using Reflector gives more information: public static Task Delay(int millisecondsDelay, CancellationToken cancellationToken) { if (millisecondsDelay < -1) { throw new ArgumentOutOfRangeException(

问题 Is there a way to implement a singleton object in C++ that is: Lazily constructed in a thread safe manner (two threads might simultaneously be the first user of the singleton - it should still only be constructed once). Doesn't rely on static variables being constructed beforehand (so the singleton object is itself safe to use during the construction of static variables). (I don't know my C++ well enough, but is it the case that integral and constant static variables are initialized before

问题 Is there a way to implement a singleton object in C++ that is: Lazily constructed in a thread safe manner (two threads might simultaneously be the first user of the singleton - it should still only be constructed once). Doesn't rely on static variables being constructed beforehand (so the singleton object is itself safe to use during the construction of static variables). (I don't know my C++ well enough, but is it the case that integral and constant static variables are initialized before

问题 Is there a way to implement a singleton object in C++ that is: Lazily constructed in a thread safe manner (two threads might simultaneously be the first user of the singleton - it should still only be constructed once). Doesn't rely on static variables being constructed beforehand (so the singleton object is itself safe to use during the construction of static variables). (I don't know my C++ well enough, but is it the case that integral and constant static variables are initialized before

问题 Is there a way to implement a singleton object in C++ that is: Lazily constructed in a thread safe manner (two threads might simultaneously be the first user of the singleton - it should still only be constructed once). Doesn't rely on static variables being constructed beforehand (so the singleton object is itself safe to use during the construction of static variables). (I don't know my C++ well enough, but is it the case that integral and constant static variables are initialized before

问题 Is there a way to implement a singleton object in C++ that is: Lazily constructed in a thread safe manner (two threads might simultaneously be the first user of the singleton - it should still only be constructed once). Doesn't rely on static variables being constructed beforehand (so the singleton object is itself safe to use during the construction of static variables). (I don't know my C++ well enough, but is it the case that integral and constant static variables are initialized before

问题 I know that now that most processors have two or more cores, multicore programming is all the rage. Is there functionality to utilize this in Java? I know that Java has a Thread class, but I also know this was around a long time before multicores became popular. If I can make use of multiple cores in Java, what class/technique would I use? 回答1: Does Java have support for multicore processors/parallel processing? Yes. It also has been a platform for other programming languages where the

问题 I know that now that most processors have two or more cores, multicore programming is all the rage. Is there functionality to utilize this in Java? I know that Java has a Thread class, but I also know this was around a long time before multicores became popular. If I can make use of multiple cores in Java, what class/technique would I use? 回答1: Does Java have support for multicore processors/parallel processing? Yes. It also has been a platform for other programming languages where the