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I'm new to programming world. I love to learn java. while going through the java threads interview questions, i found this. I have heard about thread, but not these green and native. I goggled about green and native threads, but couldn't get an clear idea.
In which case, the thread is said to be green or native?(i mean in programming)
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Unfortunately, Java does not have built-in support for green threads. Very early versions used green threads instead of native threads as the standard threading model. This changed in Java 1.2, and there has not been any support for it at the JVM level since.
Green Thread model Green Thread Model. In this model, threads are completely managed by JVM without any kind of underlying OS support. These threads are implemented at the application level and managed in user space. They are also called cooperative (user-level) threads. Only one green thread can be processed at a time ...
Overview. Multi-thread programming allows us to run threads concurrently, and each thread can handle different tasks. Thus, it makes optimal use of the resources, particularly when our computer has a multiple multi-core CPU or multiple CPUs.
Java offers two types of threads: user threads and daemon threads. User threads are high-priority threads. The JVM will wait for any user thread to complete its task before terminating it.
What is the difference between green and native threads?
Green threads are scheduled by a virtual machine.
Native threads are scheduled by a operational system.
Why does it named as green and native?
"Green" is earlier JVM threads project code-name. It is name of library, which provided VM-sheduled threads in Java 1.1
Native threads called so because they're belong to native platform.
How do we know that created thread is native or green?
Green threads are in past, JVMs work only with native threads since 1.3
"Green threads" refers to a model in which the Java virtual machine itself creates, manages, and context switches all Java threads within one operating system process. No operating system threads library is used.
"Native threads" refers to a in which the Java virtual machine creates and manages Java threads using the operating system threads library - named libthread on UnixWare - and each Java thread is mapped to one threads library thread.
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