Solaris Threads in Operating System

Solaris Multi-threaded Architecture:

Solaris supports separate thread-related concepts. These are process, user-level threads, light-weight processes and kernel threads.

1. Process: A user process is a collection of one or more application threads or user-level threads. A process includes the user’s address space, stack and PCB (Process Control Block).

2. User-Level Threads: It implements through a threads library in the address space of a process. These are invisible to the operating system.

3. Light-Weight Process: It creates the interface between user-level threads and kernel threads. Each Light-Weight Process is associated with a kernel thread. It is scheduled by the kernel independently and it may execute in parallel on multi-processors.

4. Kernel Threads: Each user process is associated with at least one kernel thread. Kernel threads are the only entity to which the kernel has access for scheduling purposes.

Process Structure in Solaris:

1. Process ID: It is the unique identification number of each process.
2. User ID: It specifies the user identification which includes login names.
3. Signal Dispatch Table: It specifies what to do when sending a signal to a person.
4. File Descriptors: These describe the state of files in use by this process.
5. Memory Map: It defines the memory space for this process.