Computer System Architecture

131. Mechanism can be referred to as adding a new facility to the system hence known as ____________:

1. Process
2. Arbitration
3. Both a & b
4. None of these

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132. Which is a mechanism used by the OS to ensure a systematic sharing of resources amongst concurrent resources:

1. Process synchronous
2. Process system
3. Process synchronization
4. All of these

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133. ____________ is basically sequence of instructions with a clear indication of beginning and end for updating shared variables

1. Critical section
2. Entry section
3. Remainder section
4. All of these

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134. Which provides a direct hardware support to mutual exclusion

1. Test-and-set(TS)
2. Swap instruction
3. Wait instruction
4. Signal instruction

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135. A process waiting to enter its critical section may have to wait for unduly ____________:

1. Short time or may have to wait forever
2. Long time or may have to wait forever
3. Short time or may have to wait for long time
4. Long time or may have to wait for short time

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136. Which is a modified version of the TS instruction which is designed to remove busy- waiting:

1. Swap instruction
2. Wait instruction
3. Signal instruction
4. Both b & c

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137. PCB stands for:

1. Process control block

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138. ____________ gets activated whenever the process encounters a busy condition code:

1. Wait instruction
2. Signal instruction
3. Both a & b
4. None of these

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139. ____________ are new and mutually exclusive operation:

1. Wait instruction
2. Signal instruction
3. Both a & b
4. None of these

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140. ____________ gets activated whenever a process leaves the critical region and the flag is set to false:

1. Wait instruction
2. Signal instruction
3. Both a & b
4. None of these

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