WGU C191: Operating Systems for Programmers
questions with verified answers
Accounting Ans✓✓✓-Tracking usage statistics for users.
Adaptive Mutex Locks Ans✓✓✓-Protects access to every critical data item by one
of two methods: if the lock is held by a thread that is currently running on another
CPU, the thread spins while waiting for the lock to become available, because the
thread holding the lock is likely to finish soon; or if the thread holding the lock is
not currently in run state, the thread blocks, going to sleep until it is awakened by
the release of the lock.
Additional Sense Code Ans✓✓✓-States the category of failure, such as a bad
command parameter or a self-test failure.
Additional Sense Code Qualifier Ans✓✓✓-Gives even more detail, such as which
command parameter was in error or which hardware subsystem failed its self-
test.
Address Space Identifier Ans✓✓✓-Allows a part of the virtual address space to
be logically associated with the file.
Advanced Local Procedure Call (ALPC) Ans✓✓✓-The scheme in which the sender
process and the receiver process must name the other to communicate.
Android Libraries Ans✓✓✓-SQLite, Open GL, Surface manager, Media
framework, Libc, and Webkit.
,Android Swapping Ans✓✓✓-Writes its application state to flash memory so that
it can be quickly restarted.
Android's Kernel Ans✓✓✓-Linux
Android's VM Ans✓✓✓-Dalvik.
Anonymous Pipes Ans✓✓✓-Windows' version of ordinary pipes.
Application Programming Interface (API) Ans✓✓✓-Specifies a set of functions
that are available to an application programmer, including the parameters that
are passed to each function and the return values the programmer can expect.
Asymmetric Encryption Ans✓✓✓-A type of encryption where 2 different keys are
used to encrypt and decrypt.
Asymmetric Multiprocessing Ans✓✓✓-Type of multiprocessing systems where
each processor is assigned a specific task. A boss processor controls the system;
the other processors either look to the boss for instruction or have predefined
tasks. This scheme defines a boss-worker relationship. The boss processor
schedules and allocates work to the worker processors.
Asynchronous Cancellation Ans✓✓✓-Terminates the target thread immediately.
Asynchronous Message Passing Ans✓✓✓-Non-blocking message passing.
,Asynchronous Procedure Call (APC) Ans✓✓✓-Enables a user thread to specify a
function that is to be called when it receives notification of a particular event.
Attack Ans✓✓✓-An attempt to break security.
Authentication Ans✓✓✓-Places constraints on the senders.
Bandwidth Ans✓✓✓-The total number of bytes transferred divided by the total
time between the first request for service
and the completion of the last transfer.
Base Register Ans✓✓✓-A memory register that holds the smallest, legal physical-
memory address.
Belady's Anomaly Ans✓✓✓-States that for some page replacement algorithms,
the page fault rate may increase as the number of allocated frames increases.
Best Fit Ans✓✓✓-A type of allocation that finds the smallest hole that is big
enough. The entire list must be searched unless the list is ordered by size.
Produces the smallest leftover hole.
Block Ans✓✓✓-A sector or group of sectors that the operating system can
address. The smallest unit of transfer.
Block-Device Interface Ans✓✓✓-Captures all the aspects necessary for accessing
disk drives and other block-oriented devices.
, Blocking System Call Ans✓✓✓-Wherein the execution of the application is
suspended.
Boot Block Ans✓✓✓-Simple code that knows the location and length of the
remainder of the bootstrap program.
Bootstrap Program Ans✓✓✓-Locates the kernel, loads it into memory, and
begins execution.
Bounded Waiting Ans✓✓✓-A bound must exist on the number of times that
other processes are allowed to enter their critical sections after a process has
made a request to enter its critical section and before that request is granted.
Bounded-Buffer Ans✓✓✓-Assumes that there is a fixed buffer size.
Breach of Availability Ans✓✓✓-Destruction of data.
Breach of Confidentiality Ans✓✓✓-Gaining access to information, credit card
numbers, personal information, etc.
Breach of Integrity Ans✓✓✓-Modified data.
Buffer Ans✓✓✓-A memory area that stores data being transferred between two
devices or between a device and an application.
Cache Ans✓✓✓-A region of fast memory that holds copies of data.
questions with verified answers
Accounting Ans✓✓✓-Tracking usage statistics for users.
Adaptive Mutex Locks Ans✓✓✓-Protects access to every critical data item by one
of two methods: if the lock is held by a thread that is currently running on another
CPU, the thread spins while waiting for the lock to become available, because the
thread holding the lock is likely to finish soon; or if the thread holding the lock is
not currently in run state, the thread blocks, going to sleep until it is awakened by
the release of the lock.
Additional Sense Code Ans✓✓✓-States the category of failure, such as a bad
command parameter or a self-test failure.
Additional Sense Code Qualifier Ans✓✓✓-Gives even more detail, such as which
command parameter was in error or which hardware subsystem failed its self-
test.
Address Space Identifier Ans✓✓✓-Allows a part of the virtual address space to
be logically associated with the file.
Advanced Local Procedure Call (ALPC) Ans✓✓✓-The scheme in which the sender
process and the receiver process must name the other to communicate.
Android Libraries Ans✓✓✓-SQLite, Open GL, Surface manager, Media
framework, Libc, and Webkit.
,Android Swapping Ans✓✓✓-Writes its application state to flash memory so that
it can be quickly restarted.
Android's Kernel Ans✓✓✓-Linux
Android's VM Ans✓✓✓-Dalvik.
Anonymous Pipes Ans✓✓✓-Windows' version of ordinary pipes.
Application Programming Interface (API) Ans✓✓✓-Specifies a set of functions
that are available to an application programmer, including the parameters that
are passed to each function and the return values the programmer can expect.
Asymmetric Encryption Ans✓✓✓-A type of encryption where 2 different keys are
used to encrypt and decrypt.
Asymmetric Multiprocessing Ans✓✓✓-Type of multiprocessing systems where
each processor is assigned a specific task. A boss processor controls the system;
the other processors either look to the boss for instruction or have predefined
tasks. This scheme defines a boss-worker relationship. The boss processor
schedules and allocates work to the worker processors.
Asynchronous Cancellation Ans✓✓✓-Terminates the target thread immediately.
Asynchronous Message Passing Ans✓✓✓-Non-blocking message passing.
,Asynchronous Procedure Call (APC) Ans✓✓✓-Enables a user thread to specify a
function that is to be called when it receives notification of a particular event.
Attack Ans✓✓✓-An attempt to break security.
Authentication Ans✓✓✓-Places constraints on the senders.
Bandwidth Ans✓✓✓-The total number of bytes transferred divided by the total
time between the first request for service
and the completion of the last transfer.
Base Register Ans✓✓✓-A memory register that holds the smallest, legal physical-
memory address.
Belady's Anomaly Ans✓✓✓-States that for some page replacement algorithms,
the page fault rate may increase as the number of allocated frames increases.
Best Fit Ans✓✓✓-A type of allocation that finds the smallest hole that is big
enough. The entire list must be searched unless the list is ordered by size.
Produces the smallest leftover hole.
Block Ans✓✓✓-A sector or group of sectors that the operating system can
address. The smallest unit of transfer.
Block-Device Interface Ans✓✓✓-Captures all the aspects necessary for accessing
disk drives and other block-oriented devices.
, Blocking System Call Ans✓✓✓-Wherein the execution of the application is
suspended.
Boot Block Ans✓✓✓-Simple code that knows the location and length of the
remainder of the bootstrap program.
Bootstrap Program Ans✓✓✓-Locates the kernel, loads it into memory, and
begins execution.
Bounded Waiting Ans✓✓✓-A bound must exist on the number of times that
other processes are allowed to enter their critical sections after a process has
made a request to enter its critical section and before that request is granted.
Bounded-Buffer Ans✓✓✓-Assumes that there is a fixed buffer size.
Breach of Availability Ans✓✓✓-Destruction of data.
Breach of Confidentiality Ans✓✓✓-Gaining access to information, credit card
numbers, personal information, etc.
Breach of Integrity Ans✓✓✓-Modified data.
Buffer Ans✓✓✓-A memory area that stores data being transferred between two
devices or between a device and an application.
Cache Ans✓✓✓-A region of fast memory that holds copies of data.
