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The interrupt priority level (IPL) is a part of the current system interrupt state, which indicates the interrupt requests that will currently be accepted
Interrupt_priority_level
Signal to a computer processor emitted by hardware or software
Laboratory TX-2 system (1957) was the first to provide multiple levels of priority interrupts. Interrupt signals may be issued in response to hardware or software
Interrupt
Hardware signal sent to a processor to interrupt a running program and handle input
Interrupt Controller (APIC) Programmable Interrupt Controller (PIC) Intel 8259 Plug and play Polling Interrupt priority level "IOAPIC - OSDev Wiki". wiki.osdev
Interrupt_request
Computer systems programming special block code
programming, an interrupt handler, also known as an interrupt service routine (ISR), is a special block of code associated with a specific interrupt condition
Interrupt_handler
Means by which Windows prioritizes interrupts that come from the system's processors
are sent to an interrupt controller. The interrupt controller sends an interrupt request (or IRQ) to the CPU with a certain priority level, and the CPU
IRQL
Unix interrupt priority control commands
change the interrupt priority level. This was historically needed to synchronize critical sections of kernel code that should not be interrupted. Newer Unix
Spl_(Unix)
Topics referred to by the same term
Processing Language, a programming language Interrupt priority level, a part of the current system interrupt state Instituto Politécnico de Leiria, a technical
IPL_(disambiguation)
Integrated circuit that handles interrupts
appropriate interrupt handler (ISR) after the PIC assesses the IRQs' relative priorities. Common modes of interrupt priority include hard priorities, rotating
Programmable interrupt controller
Programmable_interrupt_controller
Undesireable computing scheduling scenario
priority. By properly choosing the highest priority of any interrupt that ever entered the critical section, the priority inversion problem could be solved without
Priority_inversion
Microsoft Windows operating system mechanism
system mechanism which allows high-priority tasks (e.g. an interrupt handler) to defer required but lower-priority tasks for later execution. This permits
Deferred_Procedure_Call
Line of computers sold by Digital Equipment Corporation
instruction set was important. In time, as more programs were written in high-level programming languages, the instruction set became less visible, and the
VAX
Digital electronic circuit
Applications of priority encoders include their use in interrupt controllers (to allow some interrupt requests to have higher priority than others), decimal
Priority_encoder
Microprocessor
selection of a suitable interrupt handler involves a table of PCB pointers in a fixed virtual memory location. Four privilege levels are supported by the
Bellmac_32
Computer operating system for applications with critical timing constraints
higher priority needs servicing; called preemptive priority, or priority scheduling. Time-sharing – switches tasks on a regular clocked interrupt, and on
Real-time_operating_system
CPU register containing flags
additional fields such as privilege flags, interrupt enable bits, and other types of information. During an interrupt, the status of the currently executing
Status_register
Type of interrupt signal sent between computer processors
an inter-processor interrupt (IPI), also known as a shoulder tap, is a special type of interrupt by which one processor may interrupt another processor
Inter-processor_interrupt
Method by which work is assigned
priority. The recalculation of the running thread's priority value at each clock interrupt means that a thread may lose control because its priority value
Scheduling_(computing)
Lock used in computer kernels
Retrieved 2019-07-25. s = splnet(); "splx(9) — modify system interrupt priority level". NetBSD, OpenBSD. Retrieved 2019-07-25. Matthew Dillon (2019-07-22)
Giant_lock
Computer bus
granted priority over further cards. Interrupts can be delivered to the Interrupt Fielding Processor at any of four interrupt priority levels. Within
Q-Bus
Hardware interrupt that cannot be ignored
non-maskable interrupt (NMI), despite having the highest priority among interrupts, can be prevented from occurring through the use of an interrupt mask. An
Non-maskable_interrupt
two interrupt link registers (ILINK) and one branch link register (BLINK). The two interrupt link registers were ILINK1 (for level 1 (low priority) maskable
Link_register
Indicator attached to telegraph message indicating its level of urgency
of the letter "O" comes from the original name for this level, "operational immediate". PRIORITY (P) is reserved for all traffic requiring expeditious action
Message_precedence
Programmable interrupt controller
combines multiple interrupt input sources into a single interrupt output to the host microprocessor, extending the interrupt levels available in a system
Intel_8259
Real-time operating system
guest interrupt control and then started a real-time scheduler. Tasks were assigned static priorities and scheduling was originally purely priority driven
RTLinux
2018 video game
first-person roguelike action dungeon crawler video game developed by Priority Interrupt. It was released for Microsoft Windows, macOS, and Linux on February
Delver
Processor register which changes or controls the general behavior of a CPU
external interrupts and is referred to as the task-priority register (TPR). The AMD64 architecture allows software to define up to 15 external interrupt-priority
Control_register
bit accesses, 24 bit addresses 18 vector interrupts, and 4 interrupt priority levels. Frequency 10 MHz. N1839RE1A/B (Russian: Н1839РЕ1А/Б) – Microprogram
K1839
Software that manages computer hardware resources
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
Operating_system
Computer operating system
and system space sections which are common to all processes. 32 interrupt priority levels which are used for synchronization. Hardware support for delivering
OpenVMS
Small computer on a single integrated circuit
the ARMv6 architecture. Interrupt nesting. Some microcontrollers allow higher priority interrupts to interrupt lower priority ones. This allows software
Microcontroller
Microprocessor
priority interrupts. For example, if the interrupt level in the status register is set to 3, higher levels from 4 to 7 can cause an exception. Level 7
Motorola_68000
Firmware for hardware initialization and OS runtime services
then initializes a kernel. In the era of DOS, the BIOS provided BIOS interrupt calls for the keyboard, display, storage, and other input/output (I/O)
BIOS
"RESTART" interrupt NMIB Non-Maskable Interrupt input SIB Interrupt IRQ1B level interrupt input IRQ2B level interrupt input 2 timer edge interrupts 7 positive
WDC_65C134
8-bit microcontroller family
seven. There is an overflow flag, and a second interrupt enable bit, allowing four interrupt priority levels. STM8AF automobile STM8AL automobile low-power
STM8
16-bit IBM minicomputer introduced in 1965
reader has no memory buffers, but instead gives the CPU a level-zero (highest priority) interrupt after each individual column of the card has been read
IBM_1130
Specialized IBM computer model from 1960s
44 CPU at transfer rates up to 4 MiB/s. The priority interrupt feature adds thirty-two interrupt levels to the standard five. This uses locations '800'x
IBM_System/360_Model_44
Windows NT kernel image
One notable feature of NT's interrupt handling is that interrupts are usually conditionally masked based on their priority (called "IRQL"), instead of
Ntoskrnl.exe
Model independent architecture for the S/360 line of mainframe computers
priority to each interruption class, but it is only relevant when two interruptions occur simultaneously; an interruption routine can be interrupted by
IBM_System/360_architecture
36-bit computer by Digital (1966–1983)
device's priority level for interrupt handling. There are three bits in the CONO instruction, 33 through 35, allowing the device to be set to level 0 through
PDP-10
8-bit microprocessor
situations or other high-priority events (and allowing a minimalistic Z80 system to easily implement a two-level interrupt scheme in mode 1). A complete
Zilog_Z80
same priority as any other firm service. Conditional firm service is similar to firm service in that it is reserved and has priority over interruptible service
Firm_service
Real-time operating system
states (dormant, ready, running, interrupted, or pending). μC/OS-III supports an unlimited number of task priorities but configuring μC/OS-III to have
Micro-Controller Operating Systems
Micro-Controller_Operating_Systems
acting on each page and one on the mode of instructions. The interrupt system had 16 program levels in hardware, each with its own set of general-purpose registers
Nord-10
Concept in computer programming
concurrently and where the flow of control could be interrupted by an interrupt and transferred to an interrupt service routine (ISR) or "handler" subroutine
Reentrancy_(computing)
Instruction set architecture developed by Digital Equipment Corporation
service continues to assert its bus request. Whenever an interrupt exceeds the processor's priority level, the processor asserts the corresponding bus grant
PDP-11_architecture
8-bit microprocessor
direct memory access, and programmable interrupt control amongst other functions: 8214 - Priority Interrupt Control Unit 8224 – Clock generator 8228/8238
Intel_8080
Line of PowerPC-based computers
Grant Signals to the PCI slots and to the PCI bridge chips (Bandit). The interrupt manager and logic board IO controller is also the same. Both use Grand
Apple_Network_Server
Temporarily interrupting a computer task
scheduler — without assistance or cooperation from the task — of temporarily interrupting an executing task, with the intention of resuming it at a later time
Preemption_(computing)
16-bit microprocessor
non-maskable. Non-maskable interrupts are higher priority than maskable interrupts. They cannot be disabled by interrupt enable. A low to high transition
Intel_8086
Continuously checking a condition in computing
instruction). In low-level programming, busy-waits may actually be desirable. It may not be desirable or practical to implement interrupt-driven processing
Busy_waiting
Scheduling technique in computer science
the creation flags for the semaphore so as to enable the priority inheritance. All interrupt service routines (ISRs), whether they have a hard real-time
Rate-monotonic_scheduling
Concept in multi-threaded computer programming
a reentrant interrupt handler and a second interrupt arises while the mutex is locked, the second routine will hang forever. As interrupt servicing can
Thread_safety
Software interface based on commands formatted as lines of text
some cases, different levels of help can be selected for a program. Some programs supporting this allow to give a verbosity level as an optional argument
Command-line_interface
Railway signaling system
Sweden, and Belgium are equipped with Level 2 and in operation. Based on the proposal for 30 TEN-T Priority Axes and Projects during 2003, a cost/benefit
European_Train_Control_System
Component of a computer's CPU
family. Many computers have two different types of unexpected events. An interrupt occurs because some type of input or output needs software attention in
Control_unit
Group of 32-bit RISC processor cores
the Nested Vectored Interrupt Controller (NVIC). When present, it also provides an additional configurable priority SysTick interrupt. Though the SysTick
ARM_Cortex-M
8-bit microprocessor from 1975
almost immediately respond to IRQ, as IRQ is level sensitive. Thus a sort of built-in interrupt priority was established in the 6502 design. (The first
MOS_Technology_6502
Real-time operating system (RTOS) software
('proc') itself), contains only CPU scheduling, interprocess communication, interrupt redirection and timers. Everything else runs as a user process, including
QNX
Network packet distribution with multiple cores
in the kernel, right after the NIC driver. Having handled the network interrupt and before it can be processed, the packet is sent to the receiving queue
Multi-core network packet steering
Multi-core_network_packet_steering
Standard for serial communication between devices without host computer
prioritization through a process called arbitration, allowing the highest priority device to continue transmitting if multiple devices attempt to send data
CAN_bus
Aspect of Unisys 2200 Series
is done with separate locks for different priority levels. A check can be made for an empty priority level without setting a lock. The lock need only
Unisys 2200 Series system architecture
Unisys_2200_Series_system_architecture
HALT/: CPU Stopped. BAI 1; BAO 1: Bus Priority In; Bus Priority Out. IEI; IEO: Interrupt Enable In; Interrupt Enable Out. IORQ/: In / Out Request MREQ/:
Europe_Card_Bus
16-bit microprocessor
accesses. The hardware interrupt system supports a 4-bit interrupt priority input, which needed to be higher than the priority level stored in the status
TMS9900
Video microchip in the Commodore 64 and C128 home computers
control registers via machine code hooked into the raster interrupt routine (the scanline interrupt), one can program the chip to generate significantly more
MOS_Technology_VIC-II
detectors known as coherers or crystal detectors) and developed a way to interrupt his induction balance to produce a series of sparks. By trial and error
Invention_of_radio
Unisys operating system
unlimited processor quantum and run without switching unless interrupted by a higher priority real time activity or High Exec activity. Real Time activities
OS_2200
Minicomputer product line
) The relative interrupt priority of the I/O devices is determined by their position in the skip chain: If several devices interrupt, the device tested
PDP-8
special tone), Priority (D), Immediate (C) and Flash (B) with Flash Override (A) as a capability. Each had the ability to interrupt lower-priority calls in
Silver_box
Concept in computer science, referring to processes, or data
indefinitely; priority inversion, which occurs when a high-priority process is in the critical section, and it is interrupted by a medium-priority process.
Synchronization (computer science)
Synchronization_(computer_science)
Single-chip 16-bit microprocessor
an interrupt. For instance, if the value in these flags adds up to 5, any device with an interrupt value of 5 or lower (1 is the highest priority) can
National_Semiconductor_PACE
Communication between an information processing system and the outside world
for data from an input device there must be provision for generating interrupts and the corresponding type numbers for further processing by the processor
Input/output
Study of hardware and software systems that have a "real-time constraint"
interface and the disk drives lower priority than the real-time thread. Compared to these, the programmable interrupt controller of the Intel x86 family
Real-time_computing
Single chip microcontroller series by Intel
interfaces with individual baud rate generators Four priority level interrupt systems, 14 interrupt vectors Three power-saving modes Intel MCS-51 second
Intel_MCS-51
Synchronization mechanism for enforcing limits on access to a resource
to wait if a thread holding a lock is descheduled due to a time-slice interrupt or page fault. Some concurrency control strategies avoid some or all of
Lock_(computer_science)
Family of RISC-based computer architectures
register supports fast leaf function calls. A simple, but fast, 2-priority-level interrupt subsystem has switched register banks. ARM includes integer arithmetic
Arm_architecture_family
Family of network operating systems by Cisco
low priority processes, but high priority processes cannot interrupt running low priority processes. The Cisco IOS monolithic kernel does not implement
Cisco_IOS
1964 computer by English Electric
priority inversion, in which a program of high priority waits for a device made busy by a program of lower priority, requesting a distinct interrupt in
English_Electric_KDF9
Place designated for pedestrians to cross a road
technique, especially when combined with other features like pedestrian priority, refuge islands, or raised surfaces. The first pedestrian crossing signal
Pedestrian_crossing
Instruction set architecture
Separate priority and vector generation Supports up to 256 interrupts in EIC (External Interrupt Controller) mode and eight hardware interrupt pins Provides
MIPS_architecture
Property of some operation(s) in concurrent programming
Should a high priority interrupt occur when a portion of the store is complete, the operation must be completed when the interrupt level is returned. The
Linearizability
Type of motorcycle
unit at the upper rear of the cylinder head; and a lean angle sensor to interrupt the fuel injection pump, in case, for example, the bike is on its side
Yamaha_SR400_&_SR500
Mid-1960s 16-bit computer series by Hewlett Packard
user-accessible interrupt vectors, mapped to an I/O channel and arranged in priority order. So if I/O device 13 produced an interrupt, the CPU jumps to
HP_2100
Abstract data type
the topic of: Data Structures/Stacks and Queues Stack Machines - the new wave Bounding stack depth Stack Size Analysis for Interrupt-driven Programs
Stack_(abstract_data_type)
Interface used for connecting storage devices
preventing conflicts and ensuring data integrity, and Namespace Priority that sets priority levels for different namespaces, optimizing performance for critical
NVM_Express
Real-time operating system
depending on priority and a round-robin scheduling scheme. The usual interval is 1 to 10 milliseconds (1⁄1000 to 1⁄100 of a second) via an interrupt from a
FreeRTOS
Free Unix-like operating system kernel
queues). Linux interrupt service routines can be nested. A new IRQ can trap into a high priority ISR that preempts any other lower priority ISR. The Linux
Linux_kernel
Planning time spent on specific activities
order of highest priority, or assigns them a number after they are listed ("1" for highest priority, "2" for second highest priority, etc.) which indicates
Time_management
2025 mid-air collision over Washington, D.C.
a United States Army Sikorsky UH-60 Black Hawk helicopter operating as Priority Air Transport 25 collided in mid-air over the Potomac River in Washington
2025 Potomac River mid-air collision
2025_Potomac_River_mid-air_collision
Series of 16-bit minicomputers
the interrupt vector contains the address of the interrupt service routine and the second word the value to be loaded into the PSW (priority level) on
PDP-11
16-bit minicomputer series
bus. This meant that, in the case of simultaneous interrupt requests, the device that had priority was determined by which one was physically closest
Data_General_Nova
Web browser developed by Google
none of the regular interface except for the title bar, so as not to "interrupt anything the user is trying to do". This allows web applications to run
Google_Chrome
Generative AI chatbot by OpenAI
gather and summarize significant volumes of information. The user can interrupt tasks or provide additional instructions as needed. In September 2025
ChatGPT
Real-time operating system
kernel suppresses the periodic interrupt and instead programs the hardware timer dynamically so that the next interrupt fires precisely at the nearest
SuperTinyKernel_RTOS
Ethernet network card line
counter triggers a threshold logic that generates an early indication or interrupt signal before the transfer is completed. The adapter also writes timing
3Com_3c509
National activation of the Emergency Alert System
Emergency Alert System." Emergency messages are then read in this order: "We interrupt our programming; this is a national emergency. Important instructions
National_Emergency_Message
18-bit computer from Digital, 1966
error detection an entirely new design for multi-level interrupts, called the Automatic Priority Interrupt (API) option a more advanced form of memory management
PDP-9
Roman political saying which reminds that common good should be given priority over private matters for any person having a responsibility in the State
List_of_Latin_phrases_(full)
Set of standards under development by the IEEE for real-time networking
arrive. After the high-priority traffic in time slice 1 has passed and the cycle switches back to time slice 2, the interrupted frame transmission is resumed
Time-Sensitive_Networking
Swedish-Swiss multinational beauty and personal care company
original on 17 October 2020. Retrieved 18 August 2020. "India among top priority markets; to grow in double digits: Oriflame". The Economic Times. Retrieved
Oriflame
Ability of a CPU to provide multiple threads of execution concurrently
switching for interrupts. Such schemes can be considered a type of block multithreading among the user program thread and the interrupt threads.[citation
Multithreading (computer architecture)
Multithreading_(computer_architecture)
INTERRUPT PRIORITY-LEVEL
INTERRUPT PRIORITY-LEVEL
Girl/Female
Tamil
Dakshayajnavinaashini | தகà¯à®·à®¾à®¯à®¾à®œà®¨à®¾à®µà®¿à®¨à®¾à®·à®¿à®¨à¯€
Interrupter of the sacrifice of Daksha
Dakshayajnavinaashini | தகà¯à®·à®¾à®¯à®¾à®œà®¨à®¾à®µà®¿à®¨à®¾à®·à®¿à®¨à¯€
Girl/Female
American, Australian, British, English, Latin
Medieval Priories and Settlements; A Sanctuary; Sacred Place
Boy/Male
English
Temple-town. This surname refers to medieval priories and settlements of the military religious...
Surname or Lastname
English (Berkshire)
English (Berkshire) : topographic name for someone who lived on a flat, a patch of level or low-lying ground (see Flatt).
Surname or Lastname
English (Cumbria and Lancashire)
English (Cumbria and Lancashire) : habitational name for someone from Cartmel in Cumbria (formerly in Lancashire), the site of a famous priory, inland from Cartmel Sands. The place name is derived from Old Norse kartr ‘rocky ground’ + melr ‘sandbank’.
Boy/Male
English
Temple-town. This surname refers to medieval priories and settlements of the military religious...
Boy/Male
Tamil
Priority
Girl/Female
English Latin
Reference to medieval priories and settlements of the military religious order Knights Templars.
Male
Native American
Native American Navajo name ATA'HALNE means "he interrupts."
Boy/Male
English French
Servant of the priory.
Boy/Male
French
Head of a priory.
Boy/Male
Native American
He interrupts.
Girl/Female
Hindu, Indian, Marathi, Sanskrit
Continuing; Forming an Interrupted Line
Boy/Male
American, Australian, British, English, Latin
Servant of the Priory; Monastic Leader
Surname or Lastname
English
English : from a late Old English personal name Lēofweald, composed of the elements lēof ‘dear’, ‘beloved’ + weald ‘power’, ‘rule’.French : variant spelling of Level.
Girl/Female
Tamil
Dakshayajñavinaashini | தகà¯à®·à®¾à®¯à®œà¯à®žà®…விநாஷீநீ
Interrupter of the sacrifice of Daksha
Dakshayajñavinaashini | தகà¯à®·à®¾à®¯à®œà¯à®žà®…விநாஷீநீ
Surname or Lastname
English, Scottish, and northern Irish
English, Scottish, and northern Irish : occupational name for a maker of machinery, mostly in wood, of any of a wide range of kinds, from Old English wyrhta, wryhta ‘craftsman’ (a derivative of wyrcan ‘to work or make’). The term is found in various combinations (for example, Cartwright and Wainwright), but when used in isolation it generally referred to a builder of windmills or watermills.Common New England Americanized form of French Le Droit, a nickname for an upright person, a man of probity, from Old French droit ‘right’, in which there has been confusion between the homophones right and wright.
Girl/Female
Indian
Interrupter of the sacrifice of Daksha
Boy/Male
Hindu
Priority
Girl/Female
Indian
Interrupter of the sacrifice of Daksha
INTERRUPT PRIORITY-LEVEL
INTERRUPT PRIORITY-LEVEL
Female
English
Feminine form of English Everett, EVERETTE means "strong as a boar."
Boy/Male
Dutch
From the osk.
Girl/Female
Hindu
Clean water, Beauty
Boy/Male
Indian, Sanskrit
Golden Dressed
Boy/Male
Hindu
Conqueror, Small plant
Boy/Male
Indian, Punjabi, Sikh
God of Mind
Female
Hebrew
Variant spelling of Hebrew Bosmat, BASMAT means "spice" or "sweet smelling."
Girl/Female
Hindu
Clever
Surname or Lastname
English (Cornwall)
English (Cornwall) : unexplained.
Boy/Male
French
noble.
INTERRUPT PRIORITY-LEVEL
INTERRUPT PRIORITY-LEVEL
INTERRUPT PRIORITY-LEVEL
INTERRUPT PRIORITY-LEVEL
INTERRUPT PRIORITY-LEVEL
a.
Incorrupt.
v. t.
To interrupt communication with, or progress toward; to cut off, as the destination; to blockade.
p. pr. & vb. n.
of Intercept
pl.
of Priory
v. t.
To shut off or out from a place or course, by something intervening; to intercept; to cut off; to interrupt.
v. t.
To take or seize by the way, or before arrival at the destined place; to cause to stop on the passage; as, to intercept a letter; a telegram will intercept him at Paris.
imp. & p. p.
of Interrupt
n.
Priority of place in sitting.
v. t.
To obstruct or interrupt the progress of; to stop; to hinder or oppose; as, to intercept the current of a river.
a.
Tending to interrupt; interrupting.
a.
The quality or state of being prior or antecedent in time, or of preceding something else; as, priority of application.
v. i.
To interrupt; -- with in or out.
p. a.
Broken; interrupted.
v. t.
To disturb; to interrupt.
n.
The quality of being innate in the mind, or prior to experience; a priori reasoning.
n.
One who, or that which, interrupts.
v. t.
To divide; to separate; to break the monotony of; as, the evenness of the road was not interrupted by a single hill.
p. pr. & vb. n.
of Interrupt
n.
The state or condition of being antecedent; priority.
v. t.
To break into, or between; to stop, or hinder by breaking in upon the course or progress of; to interfere with the current or motion of; to cause a temporary cessation of; as, to interrupt the remarks speaking.