JVM在创建线程时如何使用操作系统？

Question

Here i try to learn java thread clearlly.. On which process JVM create the thread. Suppose if i create a thread in java then how JVM create this thread? To whom it will send to exicute?.. Which one is the base process for this...

Answer 1

Most JVMs use standard OS calls to create native threads (eg, the Win32 CreateThread API, or POSIX pthread_create ), and pass a native function within the JVM which proceeds to execute the Java code in the thread.

Answer 2

There is a separate JVM process for every running Java application. The threads that the application creates are created within that process.

Answer 3

Actually the Java Virtual Machine Specification does not specify how threads are to be handled by a JVM. There is only a high level description . The Sun JVM itself made a change in this regard: Up to Java 1.1 it used so called Green Threads that are managed by the JVM itself. Later it used native threads that the host operating system provides.