Essay Example on Symbian OS and various functions of mobile phone Operating Systems

History System Call Procedure Process Management and User Properties of Symbian OS. HISTORY. Symbian was an operating system for mobile phones made for smartphones. Symbian was initially created as an OS for PDAs in 1998 by Symbian Ltd. Symbian OS runs basically on ARM processors but an x86 port also existed, but it was never released. Symbian was utilized by many cell phone brands as Samsung, Motorola, Sony, Ericsson, Nokia, Fujitsu, Sharp, and Mitsubishi. At the end of 2010, it was the most popular smartphone OS but it was overtaken by Android. The last update for the Symbian OS was Nokia Belle. Feature Pack 2 release on October 2nd, 2017 It is written in C Symbian OS v6 0 and 6 1. This was the first version of its series. This was released in 2001 and was first used in Nokia 9210 communicator. And almost 500 000 Symbian phones were shipped in the year 2001 and the following year that number increased to a massive 2.1 million phones. Symbian OS 7 0 and 7 0s. This version was released in 2003. This version was used by Nokia, Motorola, Sony, Ericson and FOMA phones in Japan. One million Symbian phones were shipped in the first quarter of 2003 with the rate increasing to one million per month by the end of 2003 Symbian OS 8 0 and 8 1.

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This version was released in 2004. Its most significant advantage was the choice of two different kernels either EKA1 or EKA2 However EKA2 shipped a bit later than EKA1 EKA1 was used my some of the manufacturers to make it compatible with the devices which used old device drivers. Both the kernels looked almost identical in use but they were different internally. Symbian OS 9 0 and 9 1. Both of these versions did some back end improvements not visible to the user 9 0 was the final version for EKA1 Symbian OS 9 1 was released in 2005. Major improvements made in this system were security improvements but there were quite a lot of bugs in this version. Symbian OS 9 2 9 3 and 9 5. These versions improved memory management WIFI support and language support. Application launch up speed was said to be 75 much faster. Nokia Belle, Symbian OS 10 1 Released on 24 August 2011 this was considered the last update for Symbian. It added improvements to the UI through pull-down status notification bar near field communication. NFC resizable home screen and widget support SYSTEM CALL. The System Calls process is dealt with the aid of active objects. The developers noticed that the weight of the threads which were currently waiting for the call in the ready queue affected all the other threads in the system.

The active objects allow the OS to handle the system calls rather than the process handling it itself. This is done using a single scheduler. The process of system call happens in a way that active objects signals OS and suspends itself. When the system call completes the suspended process is woken up and it executes as function had returned with the data. The active object can't call a function directly and expect a return value. It must call a special function that sets up the system call and returns immediately PROCESS MANAGEMENT. The objective of any scheduling strategy is to expand CPU utilization and throughput while limiting turnaround time waiting time and response time Symbian OS is a real-time system and it utilizes a static monotonic scheduling strategy augmented by time slices. Monotonic Scheduling It arranges forms with the briefest due time first and the presentation of time cuts implies that procedures with a similar due time or no due time can be assigned time cuts and scheduling utilizing a priority scheduling scheme. There are 64 levels of priority in Symbian OS. A key to soft real-time performance is predictable execution time. There are several important characteristics that must be predictable including Latency times an important benchmark is a latency of handling interrupts. The time from an interrupt to a user thread and from an interrupt to a kernel thread. The time to move threads between queues and the CPU Manipulating scheduling queues. For example, moving processes to and from the ready queue must be bounded. The time to get information about processes. For example the time it takes to find the highest priority thread in the ready state USER PROPERTIES. Every operating system provides several features and specific characteristics from which the user can benefit and facilitate him/her.

These properties are called user properties They help the consumer or the user in performing the task efficiently and quickly and in turn it saves the user's time because the user does not have to wait needlessly for these jobs to complete so all in all it benefits the user. Several user properties that the Symbian OS provides to its users are Batch processing, Spooling Interactivity, Multitasking, Real-Time System, Multiprogramming, Distributed Environment.

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