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26 Cards in this Set
- Front
- Back
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The function name, the type each parameter, and return type
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Function signature
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Allows the concurrent execution of threads from multiple processes. Gives the illusion that each process has the machine to itself.
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Multiprogramming
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Given the CPU to execute machine instructions in a program, resides within the address space of the process; The "dispatchable" unit
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Thread
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The longest time interval a thread can have the CPU before the OS regains control
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Timeslice
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Program that has an address space and resources
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Process
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Owns the address space
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Process
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Gets the cpu
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thread
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Clock generated hardware event which transfers control to an ISR
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Interrupt
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Guarantees the OS to regain control within a certain time interval
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ISR (Interrupt Support Routine)
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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)
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Context Switching
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Program counter, register set, and condition codes of a thread
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State
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Has clock-interrupt-isr-dispatch sequence
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Pre-emptive multiprogramming
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Relies on each thread to voluntarily relinquish the CPU
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Non-preemptive multiprogramming
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To be an OS the multiprogramming environment must be
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Pre-emptive
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Retreives directory info
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opendir
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Returns file names in a directory
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readdir
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C-language string resides within
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array of chars
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String array ends with a
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null char, \0
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Synchronous events that are responses of the CPU to conditions detected during the execution of an instruction (such as an error)
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Exceptions
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Asynchronous events triggered by controllers whose devices need attention, or by the clock
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Interrupts
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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
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Race Conditions
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%d %i %o %s
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decimal, integer, hex, string
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malloc
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memory allocation, instantiate a variable to reserve a memory area
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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 |
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System call causes a new process to be created, having a copy of the address space of the original process.
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Fork
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Creates an I/O mechanism and returns (takes in and modifies) two file descriptors. Successful completion returns a 0.
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Pipe
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