JDK 1.1 for Solaris Developer's Guide

Java Threads in the Solaris Environment -- Earlier Releases*

Previous to Java on Solaris 2.6 software, the Java runtime used a user-level threads library called "green threads," part of the Java runtime thread and system support layer. Because the green threads library was user-level and the Solaris system could process only one green thread at a time, Solaris handled the Java runtime as a many-to-one threading implementation (refer to "Many-to-One Model (Green Threads)"). As a result, several problems arose:

To substantially increase application performance, the green threads library was replaced with native Solaris threads for Java on the Solaris 2.6 platform; this is carried forward on the Solaris 7 and Solaris 8 platforms.