-Give a definition of the critical section problem and explain the purpose of the entry and exit code blocks

1 answer:

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Answer: In operating system a code segment which accesses some shared variables or resources one at a time atomically such other no other code or process is accessing that resource or variable at the same time.

Entry section code block allows the access to the shared resource or variable and exit section code signals the termination from access to the shared resource or variable.

Explanation:

Entry and exit section codes needs to check certain properties before allowing the access and removal of access to a particular code segment.

These conditions are:

1. Bounded waiting.

2. Mutual exclusion.

3. checking thread execution status to allows other threads to enter the critical section (CS).

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Hibernation Edit
Main article: Hibernation (computing)
Hibernation, also called Suspend to Disk on Linux, saves all computer operational data on the fixed disk before turning the computer off completely. On switching the computer back on, the computer is restored to its state prior to hibernation, with all programs and files open, and unsaved data intact. In contrast with standby mode, hibernation mode saves the computer's state on the hard disk, which requires no power to maintain, whereas standby mode saves the computer's state in RAM, which requires a small amount of power to maintain.

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Sleep mode and hibernation can be combined: the contents of RAM are first copied to non-volatile storage like for regular hibernation, but then, instead of powering down, the computer enters sleep mode. This approach combines the benefits of sleep mode and hibernation: The machine can resume instantaneously, but it can also be powered down completely (e.g. due to loss of power) without loss of data, because it is already effectively in a state of hibernation. This mode is called "hybrid sleep" in Microsoft Windows other than Windows XP.

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ACPI Edit
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