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  2. CPU modes - Wikipedia

    en.wikipedia.org/wiki/CPU_modes

    Several computer systems introduced in the 1960s, such as the IBM System/360, DEC PDP-6/PDP-10, the GE-600/Honeywell 6000 series, and the Burroughs B5000 series and B6500 series, support two CPU modes; a mode that grants full privileges to code running in that mode, and a mode that prevents direct access to input/output devices and some other hardware facilities to code running in that mode.

  3. Protected mode - Wikipedia

    en.wikipedia.org/wiki/Protected_mode

    In computing, protected mode, also called protected virtual address mode, [1] is an operational mode of x86-compatible central processing units (CPUs). It allows system software to use features such as segmentation , virtual memory , paging and safe multi-tasking designed to increase an operating system's control over application software .

  4. Runlevel - Wikipedia

    en.wikipedia.org/wiki/Runlevel

    Single-user mode, booted to system console only, with only root filesystem mounted (as read-only) s: Single-user mode, identical to S except the current terminal acts as the system console 1: Single-user mode with local filesystems mounted (read-write) 2: Multi-user mode with most daemons started and Common Desktop Environment launched 3

  5. Fix problems reading or receiving AOL Mail

    help.aol.com/articles/fix-problems-reading-or...

    Clear your browser's cache to reset your browser and wipe out all the little unwanted bits of info that have been stored, making it overall run better. Fix problems with missing emails When emails go missing in AOL Mail, it's often due to a few simple things; either the message is in the wrong folder, your third-party mail client's settings, or ...

  6. Process state - Wikipedia

    en.wikipedia.org/wiki/Process_state

    A process moves into the running state when it is chosen for execution. The process's instructions are executed by one of the CPUs (or cores) of the system. There is at most one running process per CPU or core. A process can run in either of the two modes, namely kernel mode or user mode. [1] [2]

  7. Readers–writer lock - Wikipedia

    en.wikipedia.org/wiki/Readers–writer_lock

    Upgrading a lock from read-mode to write-mode is prone to deadlocks, since whenever two threads holding reader locks both attempt to upgrade to writer locks, a deadlock is created that can only be broken by one of the threads releasing its reader lock. The deadlock can be avoided by allowing only one thread to acquire the lock in "read-mode ...

  8. Long mode - Wikipedia

    en.wikipedia.org/wiki/Long_mode

    An x86-64 processor acts identically to an IA-32 processor when running in real mode or protected mode, which are supported modes when the processor is not in long mode.. A bit in the CPUID extended attributes field informs programs in real or protected modes if the processor can go to long mode, which allows a program to detect an x86-64 processor.

  9. Degraded mode - Wikipedia

    en.wikipedia.org/wiki/Degraded_mode

    Depending on the severity of the problem, the array may be placed into a read-only mode, either automatically or by the system administrator, until it can be corrected. Such corrections may or may not be possible to do on-line (as opposed to an "off-line" repair, during which the system is unavailable to users). Many RAID configurations feature ...