65-563: The LG KC910 Renoir is a high-end feature phone released by LG Electronics . The LG Renoir was the world's first full touchscreen 8-megapixel camera phone . It debuted on 2 October 2008 as the successor of the LG Viewty . Like the Viewty is incorporates xenon flash with Schneider Kreuznach optics. Named after Pierre-Auguste Renoir , the LG Renoir adds several new capabilities over
130-428: A system call to perform a block I/O write operation, then the system call might execute the following instructions: While the writing takes place, the operating system will context switch to other processes as normal. When the device finishes writing, the device will interrupt the currently running process by asserting an interrupt request . The device will also place an integer onto the data bus. Upon accepting
195-557: A community of one million or more people. Students also ranked high among smartphone owners. Mobile phones in Japan diverged from those used elsewhere, with carriers and devices often implementing advanced features; such as NTT docomo 's i-mode platform for mobile internet in 1999, mobile payments , mobile television , and near field communications ; that were not yet widely used, or even adopted, outside of Japan. This divergence has been cited as an example of Galápagos syndrome ; as
260-645: A computer even if they are not compatible with the base operating system. A library operating system (libOS) is one in which the services that a typical operating system provides, such as networking, are provided in the form of libraries and composed with a single application and configuration code to construct a unikernel : a specialized (only the absolute necessary pieces of code are extracted from libraries and bound together ), single address space , machine image that can be deployed to cloud or embedded environments. The operating system code and application code are not executed in separated protection domains (there
325-585: A development of MULTICS for a single user. Because UNIX's source code was available, it became the basis of other, incompatible operating systems, of which the most successful were AT&T 's System V and the University of California 's Berkeley Software Distribution (BSD). To increase compatibility, the IEEE released the POSIX standard for operating system application programming interfaces (APIs), which
390-484: A large legal settlement was paid. In the twenty-first century, Windows continues to be popular on personal computers but has less market share of servers. UNIX operating systems, especially Linux, are the most popular on enterprise systems and servers but are also used on mobile devices and many other computer systems. On mobile devices, Symbian OS was dominant at first, being usurped by BlackBerry OS (introduced 2002) and iOS for iPhones (from 2007). Later on,
455-442: A library with no protection between applications, such as eCos . A hypervisor is an operating system that runs a virtual machine . The virtual machine is unaware that it is an application and operates as if it had its own hardware. Virtual machines can be paused, saved, and resumed, making them useful for operating systems research, development, and debugging. They also enhance portability by enabling applications to be run on
520-447: A malformed machine instruction . However, the most common error conditions are division by zero and accessing an invalid memory address . Users can send messages to the kernel to modify the behavior of a currently running process. For example, in the command-line environment , pressing the interrupt character (usually Control-C ) might terminate the currently running process. To generate software interrupts for x86 CPUs,
585-455: A particular application's memory is stored, or even whether or not it has been allocated yet. In modern operating systems, memory which is accessed less frequently can be temporarily stored on a disk or other media to make that space available for use by other programs. This is called swapping , as an area of memory can be used by multiple programs, and what that memory area contains can be swapped or exchanged on demand. Virtual memory provides
650-503: A program does not interfere with memory already in use by another program. Since programs time share, each program must have independent access to memory. Cooperative memory management, used by many early operating systems, assumes that all programs make voluntary use of the kernel 's memory manager, and do not exceed their allocated memory. This system of memory management is almost never seen any more, since programs often contain bugs which can cause them to exceed their allocated memory. If
715-408: A program fails, it may cause memory used by one or more other programs to be affected or overwritten. Malicious programs or viruses may purposefully alter another program's memory, or may affect the operation of the operating system itself. With cooperative memory management, it takes only one misbehaved program to crash the system. Memory protection enables the kernel to limit a process' access to
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#1732783892354780-440: A program tries to access memory that is not accessible memory, but nonetheless has been allocated to it, the kernel is interrupted (see § Memory management ) . This kind of interrupt is typically a page fault . When the kernel detects a page fault it generally adjusts the virtual memory range of the program which triggered it, granting it access to the memory requested. This gives the kernel discretionary power over where
845-527: A result, these feature phones are retroactively referred to as a 'gala-phone' ( ガラケー , gara-kei ) , blending with 'mobile phone' ( 携帯 , keitai ) . While smartphones have gained popularity (and implement features introduced on them), many gala-phones are still commonly used, citing preferences for the devices and their durability over smartphones. Mobile games oriented towards smartphones have seen significant growth and revenue in Japan, even though there were three times fewer smartphone users in
910-704: A robust operating system, embracing third-party software, and having capabilities such as multitasking and graphics capabilities in order to meet future consumer demands. These platforms also eclipsed the popularity of smartphone platforms historically aimed towards enterprise markets, such as BlackBerry. There has been an industry shift from feature phones (including low-end smartphones), which rely mainly on volume sales, to high-end flagship smartphones, which also enjoy higher margins, thus manufacturers find high-end smartphones much more lucrative than feature phones. The shift away from feature phones has forced mobile network operators to increase subsidies of handsets, and
975-470: A significant amount of CPU time. Direct memory access (DMA) is an architecture feature to allow devices to bypass the CPU and access main memory directly. (Separate from the architecture, a device may perform direct memory access to and from main memory either directly or via a bus.) When a computer user types a key on the keyboard, typically the character appears immediately on the screen. Likewise, when
1040-523: A small non-touch display. Feature phones tend to use an embedded operating system with a small and simple graphical user interface , unlike large and complex mobile operating systems on smartphones . The functions of feature phones are limited compared to smartphones. Following the rise of smartphones, the feature phone has sometimes been referred to as a dumbphone . However, some feature phones can provide functions found in smartphones, including internet capabilities, apps, and mobile games . Prior to
1105-402: A specific moment in time. Hard real-time systems require exact timing and are common in manufacturing , avionics , military, and other similar uses. With soft real-time systems, the occasional missed event is acceptable; this category often includes audio or multimedia systems, as well as smartphones. In order for hard real-time systems be sufficiently exact in their timing, often they are just
1170-417: A user moves a mouse , the cursor immediately moves across the screen. Each keystroke and mouse movement generates an interrupt called Interrupt-driven I/O . An interrupt-driven I/O occurs when a process causes an interrupt for every character or word transmitted. Devices such as hard disk drives , solid-state drives , and magnetic tape drives can transfer data at a rate high enough that interrupting
1235-453: A variation of the classic reader/writer problem . The writer receives a pipe from the shell for its output to be sent to the reader's input stream. The command-line syntax is alpha | bravo . alpha will write to the pipe when its computation is ready and then sleep in the wait queue. bravo will then be moved to the ready queue and soon will read from its input stream. The kernel will generate software interrupts to coordinate
1300-418: Is interrupted by it. Operating systems are found on many devices that contain a computer – from cellular phones and video game consoles to web servers and supercomputers . In the personal computer market, as of September 2024 , Microsoft Windows holds a dominant market share of around 73%. macOS by Apple Inc. is in second place (15%), Linux is in third place (5%), and ChromeOS
1365-562: Is remote direct memory access , which enables each CPU to access memory belonging to other CPUs. Multicomputer operating systems often support remote procedure calls where a CPU can call a procedure on another CPU, or distributed shared memory , in which the operating system uses virtualization to generate shared memory that does not physically exist. A distributed system is a group of distinct, networked computers—each of which might have their own operating system and file system. Unlike multicomputers, they may be dispersed anywhere in
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#17327838923541430-484: Is a change away from the currently running process. Similarly, both hardware and software interrupts execute an interrupt service routine . Software interrupts may be normally occurring events. It is expected that a time slice will occur, so the kernel will have to perform a context switch . A computer program may set a timer to go off after a few seconds in case too much data causes an algorithm to take too long. Software interrupts may be error conditions, such as
1495-496: Is based on Nucleus RTOS . Additionally, many phones could access the internet using Wireless Application Protocol . KaiOS can be used as an operating system for feature phones that supports certain apps written using HTML5. Operating system An operating system ( OS ) is system software that manages computer hardware and software resources, and provides common services for computer programs . Time-sharing operating systems schedule tasks for efficient use of
1560-422: Is difficult to define, but has been called "the layer of software that manages a computer's resources for its users and their applications ". Operating systems include the software that is always running, called a kernel —but can include other software as well. The two other types of programs that can run on a computer are system programs —which are associated with the operating system, but may not be part of
1625-896: Is in fourth place (2%). In the mobile sector (including smartphones and tablets ), as of September 2023 , Android's share is 68.92%, followed by Apple's iOS and iPadOS with 30.42%, and other operating systems with .66%. Linux distributions are dominant in the server and supercomputing sectors. Other specialized classes of operating systems (special-purpose operating systems), such as embedded and real-time systems, exist for many applications. Security-focused operating systems also exist. Some operating systems have low system requirements (e.g. light-weight Linux distribution ). Others may have higher system requirements. Some operating systems require installation or may come pre-installed with purchased computers ( OEM -installation), whereas others may run directly from media (i.e. live CD ) or flash memory (i.e. USB stick). An operating system
1690-443: Is only a single application running, at least conceptually, so there is no need to prevent interference between applications) and OS services are accessed via simple library calls (potentially inlining them based on compiler thresholds), without the usual overhead of context switches , in a way similarly to embedded and real-time OSes. Note that this overhead is not negligible: to the direct cost of mode switching it's necessary to add
1755-499: Is supported by most UNIX systems. MINIX was a stripped-down version of UNIX, developed in 1987 for educational uses, that inspired the commercially available, free software Linux . Since 2008, MINIX is used in controllers of most Intel microchips , while Linux is widespread in data centers and Android smartphones. The invention of large scale integration enabled the production of personal computers (initially called microcomputers ) from around 1980. For around five years,
1820-473: Is that they do not load user-installed software. Consequently, they do not need protection between different applications, enabling simpler designs. Very small operating systems might run in less than 10 kilobytes , and the smallest are for smart cards . Examples include Embedded Linux , QNX , VxWorks , and the extra-small systems RIOT and TinyOS . A real-time operating system is an operating system that guarantees to process events or data by or at
1885-435: Is the part of the operating system that provides protection between different applications and users. This protection is key to improving reliability by keeping errors isolated to one program, as well as security by limiting the power of malicious software and protecting private data, and ensuring that one program cannot monopolize the computer's resources. Most operating systems have two modes of operation: in user mode ,
1950-542: The CP/M (Control Program for Microcomputers) was the most popular operating system for microcomputers. Later, IBM bought the DOS (Disk Operating System) from Microsoft . After modifications requested by IBM, the resulting system was called MS-DOS (MicroSoft Disk Operating System) and was widely used on IBM microcomputers. Later versions increased their sophistication, in part by borrowing features from UNIX. Apple 's Macintosh
2015-504: The INT assembly language instruction is available. The syntax is INT X , where X is the offset number (in hexadecimal format) to the interrupt vector table . To generate software interrupts in Unix-like operating systems, the kill(pid,signum) system call will send a signal to another process. pid is the process identifier of the receiving process. signum is
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2080-420: The transistor in the mid-1950s, mainframes began to be built. These still needed professional operators who manually do what a modern operating system would do, such as scheduling programs to run, but mainframes still had rudimentary operating systems such as Fortran Monitor System (FMS) and IBSYS . In the 1960s, IBM introduced the first series of intercompatible computers ( System/360 ). All of them ran
2145-410: The CPU for every byte or word transferred, and having the CPU transfer the byte or word between the device and memory, would require too much CPU time. Data is, instead, transferred between the device and memory independently of the CPU by hardware such as a channel or a direct memory access controller; an interrupt is delivered only when all the data is transferred. If a computer program executes
2210-474: The CPU to re-enter supervisor mode , placing the kernel in charge. This is called a segmentation violation or Seg-V for short, and since it is both difficult to assign a meaningful result to such an operation, and because it is usually a sign of a misbehaving program, the kernel generally resorts to terminating the offending program, and reports the error. Windows versions 3.1 through ME had some level of memory protection, but programs could easily circumvent
2275-558: The United States, technological innovation with regard to expanded functionality was a secondary consideration, as phone designs there centred on miniaturisation. Existing feature phone operating systems at the time were not designed to handle additional tasks beyond communication and basic functions, and due to the complex bureaucracy and other factors, they never developed a thriving software ecosystem. By contrast, iPhone OS (renamed iOS in 2010) and Android were designed as
2340-428: The Viewty, including GPS support, Wi-Fi support, an accelerometer, and Dolby Mobile audio support. Originally released in black, a pink coloured version was released in 2009. Feature phone A feature phone (also spelled featurephone ), brick phone , or dumbphone , is a mobile phone that retains the form factor of earlier generations of mobile telephones, typically with press-button based inputs and
2405-538: The application program, which then interacts with the user and with hardware devices. However, in some systems an application can request that the operating system execute another application within the same process, either as a subroutine or in a separate thread, e.g., the LINK and ATTACH facilities of OS/360 and successors . An interrupt (also known as an abort , exception , fault , signal , or trap ) provides an efficient way for most operating systems to react to
2470-453: The computer's memory. Various methods of memory protection exist, including memory segmentation and paging . All methods require some level of hardware support (such as the 80286 MMU), which does not exist in all computers. In both segmentation and paging, certain protected mode registers specify to the CPU what memory address it should allow a running program to access. Attempts to access other addresses trigger an interrupt, which causes
2535-437: The country than in the United States as of 2017. Java ME was a popular software platform for feature phones in the 2000s, with 3 billion devices supporting it as of 2013. Other platforms which saw significant adoption at this time include Qualcomm's Binary Runtime Environment for Wireless , abbreviated as BREW, and Adobe's Flash Lite . MediaTek developed an embedded operating system named MAUI Runtime Environment which
2600-471: The details of how interrupt service routines behave vary from operating system to operating system. However, several interrupt functions are common. The architecture and operating system must: A software interrupt is a message to a process that an event has occurred. This contrasts with a hardware interrupt — which is a message to the central processing unit (CPU) that an event has occurred. Software interrupts are similar to hardware interrupts — there
2665-422: The environment. Interrupts cause the central processing unit (CPU) to have a control flow change away from the currently running program to an interrupt handler , also known as an interrupt service routine (ISR). An interrupt service routine may cause the central processing unit (CPU) to have a context switch . The details of how a computer processes an interrupt vary from architecture to architecture, and
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2730-478: The first time that smartphones have outsold feature phones. Smartphones accounted for 51.8 percent of mobile phone sales in the second quarter of 2013, resulting in smartphone sales surpassing feature phone sales for the first time. A survey of 4,001 Canadians by Media Technology Monitor (MTM) in late 2012 suggested about 83 percent of the anglophone population owned a cellphone, up from 80 percent in 2011 and 74 percent in 2010. About two thirds of
2795-410: The hardware checks that the software is only executing legal instructions, whereas the kernel has unrestricted powers and is not subject to these checks. The kernel also manages memory for other processes and controls access to input/output devices. The operating system provides an interface between an application program and the computer hardware, so that an application program can interact with
2860-493: The hardware only by obeying rules and procedures programmed into the operating system. The operating system is also a set of services which simplify development and execution of application programs. Executing an application program typically involves the creation of a process by the operating system kernel , which assigns memory space and other resources, establishes a priority for the process in multi-tasking systems, loads program binary code into memory, and initiates execution of
2925-666: The high selling-prices of flagship smartphones have had a negative effect on the mobile network operators, who have seen their earnings before interest, taxes, depreciation, and amortisation (EBITDA) margins drop as they sold more smartphones and fewer feature phones. To help make up for this, carriers typically use high-end devices to upsell customers onto higher-priced service plans with increased data allotments. Trends have shown that consumers are willing to pay more for smartphones that include newer features and technology, and that smartphones were considered to be more relevant in present-day popular culture than feature phones. During
2990-418: The indirect pollution of important processor structures (like CPU caches , the instruction pipeline , and so on) which affects both user-mode and kernel-mode performance. The first computers in the late 1940s and 1950s were directly programmed either with plugboards or with machine code inputted on media such as punch cards , without programming languages or operating systems. After the introduction of
3055-404: The interrupt request, the operating system will: When the writing process has its time slice expired, the operating system will: With the program counter now reset, the interrupted process will resume its time slice. Among other things, a multiprogramming operating system kernel must be responsible for managing all system memory which is currently in use by the programs. This ensures that
3120-431: The kernel—and applications—all other software. There are three main purposes that an operating system fulfills: With multiprocessors multiple CPUs share memory. A multicomputer or cluster computer has multiple CPUs, each of which has its own memory . Multicomputers were developed because large multiprocessors are difficult to engineer and prohibitively expensive; they are universal in cloud computing because of
3185-582: The late 2010s and early 2020s, multiple new companies were formed specifically to manufacture and sell such phones in North America. These companies reported accelerated growth in 2023 and early 2024, driven by those who find contemporary smartphones too addictive , including parents worried about their children developing such addictions. In developed economies in the mid 2000s to early 2010s, fashion and brand loyalty drove sales, as markets had matured and people moved to their second and third phones. In
3250-400: The memory allocated to a different one. Around the same time, teleprinters began to be used as terminals so multiple users could access the computer simultaneously. The operating system MULTICS was intended to allow hundreds of users to access a large computer. Despite its limited adoption, it can be considered the precursor to cloud computing . The UNIX operating system originated as
3315-506: The mid-2000s, best-selling feature phones such as the fashionable flip-phone Motorola Razr , multimedia Sony Ericsson W580i , and the LG Black Label Series not only occupied the mid-range pricing in a wireless provider's range, they made up the bulk of retail sales as smartphones from BlackBerry and Palm were still considered a niche category for business use. Even as late as 2009, smartphone penetration in North America
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#17327838923543380-410: The mobile phone owners polled said they had a smartphone, and the other third had feature phones or non-smartphones. According to MTM, non-smartphone users are more likely to be female, older, have a lower income, live in a small community, and have less education. The survey found that smartphone owners tend to be male, younger, live in a high-income household with children in the home, and residents of
3445-408: The need to use it. A general protection fault would be produced, indicating a segmentation violation had occurred; however, the system would often crash anyway. The use of virtual memory addressing (such as paging or segmentation) means that the kernel can choose what memory each program may use at any given time, allowing the operating system to use the same memory locations for multiple tasks. If
3510-408: The open-source Android operating system (introduced 2008), with a Linux kernel and a C library ( Bionic ) partially based on BSD code, became most popular. The components of an operating system are designed to ensure that various parts of a computer function cohesively. With the de facto obsoletion of DOS , all user software must interact with the operating system to access hardware. The kernel
3575-595: The outdoors, at workplaces that proscribe dedicated cameras, and as an emergency telephone . Several models are equipped with hardware functions; such as FM radio and flashlight , that prevent the device from becoming useless in the event of a major disaster, or entirely obsolete, if and when 2G network infrastructure is shut down. Other feature phones are specifically designed for the elderly, and yet others for religious purposes . In Pakistan and other South Asian countries, many mobile phone outlets use feature phones for balance transfer , referred to as Easyload . In
3640-421: The piping. Signals may be classified into 7 categories. The categories are: Input/output (I/O) devices are slower than the CPU. Therefore, it would slow down the computer if the CPU had to wait for each I/O to finish. Instead, a computer may implement interrupts for I/O completion, avoiding the need for polling or busy waiting. Some computers require an interrupt for each character or word, costing
3705-621: The popularity of smartphones , the term 'feature phone' was often used on high-end mobile telephones with assorted functions for retail customers, developed at the advent of 3G networks, which allowed sufficient bandwidth for these capabilities. Depending on extent of functionality, feature phones may have many of the capabilities of a smartphone, within certain cases. The first GSM phones and many feature phones had NOR flash memory , from which processor instructions could be executed directly in an execute in place architecture and allowed for short boot times. With smartphones, NAND flash memory
3770-418: The same operating system— OS/360 —which consisted of millions of lines of assembly language that had thousands of bugs . The OS/360 also was the first popular operating system to support multiprogramming , such that the CPU could be put to use on one job while another was waiting on input/output (I/O). Holding multiple jobs in memory necessitated memory partitioning and safeguards against one job accessing
3835-400: The signal number (in mnemonic format) to be sent. (The abrasive name of kill was chosen because early implementations only terminated the process.) In Unix-like operating systems, signals inform processes of the occurrence of asynchronous events. To communicate asynchronously, interrupts are required. One reason a process needs to asynchronously communicate to another process solves
3900-400: The size of the machine needed. The different CPUs often need to send and receive messages to each other; to ensure good performance, the operating systems for these machines need to minimize this copying of packets . Newer systems are often multiqueue —separating groups of users into separate queues —to reduce the need for packet copying and support more concurrent users. Another technique
3965-442: The system and may also include accounting software for cost allocation of processor time , mass storage , peripherals, and other resources. For hardware functions such as input and output and memory allocation , the operating system acts as an intermediary between programs and the computer hardware, although the application code is usually executed directly by the hardware and frequently makes system calls to an OS function or
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#17327838923544030-473: The world. Middleware , an additional software layer between the operating system and applications, is often used to improve consistency. Although it functions similarly to an operating system, it is not a true operating system. Embedded operating systems are designed to be used in embedded computer systems , whether they are internet of things objects or not connected to a network. Embedded systems include many household appliances. The distinguishing factor
4095-534: Was adopted as it has larger storage capacities and lower costs, but causes longer boot times because instructions cannot be executed from it directly, and must be copied to RAM memory first before execution. In developed economies, feature phones are primarily specific to niche markets , or have become merely a preference; owing to certain feature combinations not available in other devices, such as their affordability, durability, and simplicity. A well-specified feature phone can be used in industrial environments, and
4160-542: Was low. In 2011, feature phones accounted for 60 percent of the mobile telephones in the United States , and 70 percent of mobile phones sold worldwide. According to Gartner in Q2 2013, 225 million smartphones were sold worldwide which represented a 46.5 percent gain over the same period in 2012, while 210 million feature phones were sold, which was a decrease of 21 percent year over year,
4225-406: Was the first popular computer to use a graphical user interface (GUI). The GUI proved much more user friendly than the text-only command-line interface earlier operating systems had used. Following the success of Macintosh, MS-DOS was updated with a GUI overlay called Windows . Windows later was rewritten as a stand-alone operating system, borrowing so many features from another ( VAX VMS ) that
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