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26 Cards in this Set

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The function name, the type each parameter, and return type
Function signature
Allows the concurrent execution of threads from multiple processes. Gives the illusion that each process has the machine to itself.
Multiprogramming
Given the CPU to execute machine instructions in a program, resides within the address space of the process; The "dispatchable" unit
Thread
The longest time interval a thread can have the CPU before the OS regains control
Timeslice
Program that has an address space and resources
Process
Owns the address space
Process
Gets the cpu
thread
Clock generated hardware event which transfers control to an ISR
Interrupt
Guarantees the OS to regain control within a certain time interval
ISR (Interrupt Support Routine)
Saving the state of a thread from a process and restoring the state of another thread from a process (could be the same or a different process)
Context Switching
Program counter, register set, and condition codes of a thread
State
Has clock-interrupt-isr-dispatch sequence
Pre-emptive multiprogramming
Relies on each thread to voluntarily relinquish the CPU
Non-preemptive multiprogramming
To be an OS the multiprogramming environment must be
Pre-emptive
Retreives directory info
opendir
Returns file names in a directory
readdir
C-language string resides within
array of chars
String array ends with a
null char, \0
Synchronous events that are responses of the CPU to conditions detected during the execution of an instruction (such as an error)
Exceptions
Asynchronous events triggered by controllers whose devices need attention, or by the clock
Interrupts
A situation where several processes access and manipulate the same data concurrently and the outcome of execution depends on the particular order in which the access takes place
Race Conditions
%d %i %o %s
decimal, integer, hex, string
malloc
memory allocation, instantiate a variable to reserve a memory area
stat(path, buf)
buf->st_size
buf->st_mode
Get the statistics for a file, use this path, put it in that buffer.

st_size = size of stat
st_mode = mode of stat
chmod = change mode
System call causes a new process to be created, having a copy of the address space of the original process.
Fork
Creates an I/O mechanism and returns (takes in and modifies) two file descriptors. Successful completion returns a 0.
Pipe