Entry test
AIO Mastery Quiz
Test your knowledge of Asynchronous Input/Output (AIO) concepts with this comprehensive quiz designed for developers and students alike. Each question challenges your understanding of AIO operations in a POSIX environment, ranging from basic concepts to intricacies of its implementation.
Features:
- 11 questions covering essential AIO topics
- Checkbox and multiple-choice formats
- Perfect for reinforcing your practical knowledge
The aio_error function
Can read an error code of an AIO operation (including 0 indicating success)
Returns the status of an AIO operation
Is a blocking function - allows to wait for an AIO operation to finish
Reads the same result value for an AIO operation as value returned by synchronous calls to read / write/ fsync
What means can POSIX AIO use to notify about a finished read or write operation?
By starting a new thread
By starting a new process
By a specified mutex
By a signal delivery
By sending a specified byte to the standart input of the process
In which aspects aio_write and write behave differently (not taking into account that aio_write must be synced)?
Possibility of getting error indication insufficient space on the device
Setting the position where the bytes will be written
Interruption of the operation by a signal after writing some bytes
Interruption of the operation by a signal before writing any bytes
Maximum number of bytes that can be read vy this function
Ability to tell if the end of file was reached
Position in file where bytes will be read
A call to aio_suspend has returned success (value 0). Calling the function again immediately with exactly the same parameter values will result in:
The function will return successfully after the first not yet finished aio operation from the list will end or will return instantaneously if there is no such operation
The function will return with an error and set errno to the value indicating bad arguments
The function will block indefinitely unless interrupted by a signal delivery
The function will return successfully after the first not yet finished aio operation from the list will end or will block indefinitely if there is no such operation unless interrupted by a signal delivery
The function will return instantaneously
How to efficiently check the file size in a POSIX system?
Use readdir which returns a structure containing file size information
Use lseek
Use stat
Read all bytes from the file and count them
Doing simultaneous AIO read and write at the same position in the same file will result in:
The read operation will return the old contents
The read operation will return EINVAL error
Undefined values of read bytes
The write operation will return EINVAL ERROR
The read operation will return the new contents
A call to aio_suspend succeeded. How to tell which of aio operations finished
By checking each of aiocb structures using aio_return
By examining block length in aiocb structures
By examining the number returned by the function
By examining the errno variable
By checking each of aiocb structures using aio_error
Which kinds of AIO implementation are allowed by POSIX?
Implementation of AIO within operating system kernel
Userspace implementation of AIO using threads
No AIO implementation, aio functions will return ENOSYS error
Which of the following function may return errors that occured during an AIO operation?
Aio_write
Aio_error
Aio_fsync
Aio_return
The aio_error function
Returns the status of an AIO operation
Can read an error code of an AIO operation (including 0 indicating success)
Is a blocking function - allows to wait for an AIO operation to finish
Returns the same result value for an AIO operation as value returned by synchronous calls to read / write / fsync
Does posix allow the case when aio_return called on block which was read with aio_read (after t
True
False
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