Two threads (A and B) are concurrently running on a dual-core processor that implements a sequentially consistent memory model. Assume that the value at address (R10) is initialized to 0. The instruction st immediate, (R10) writes an immediate number into the memory address stored in R10. Thread A (core 1) (R10) (R10) (R10) (R10) 0x1, R1, Ох2, Thread B (core 1) (R10) (R10) (R10) (R10) 1: st 1: st Ох3, 2: ld 2: ld R3, Ох4, R4, 3: st 3: st 4: ld R2, 4: ld After both threads have finished executing, you find that (R1, R2, R3, R4) = (1, 2, 3, 4). How many different instruction interleavings of the two threads produce this result?

Two threads (A and B) are concurrently running on a dual-core processor that implements a sequentially consistent memory model. Assume that the value at address (R10) is initialized to 0. The instruction st immediate, (R10) writes an immediate number into the memory address stored in R10. Thread A (core 1) (R10) (R10) (R10) (R10) 0x1, R1, Ох2, Thread B (core 1) (R10) (R10) (R10) (R10) 1: st 1: st Ох3, 2: ld 2: ld R3, Ох4, R4, 3: st 3: st 4: ld R2, 4: ld After both threads have finished executing, you find that (R1, R2, R3, R4) = (1, 2, 3, 4). How many different instruction interleavings of the two threads produce this result?

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Two threads (A and B) are concurrently running on a dual-core processor that implements a sequentially
consistent memory model. Assume that the value at address (R10) is initialized to 0. The instruction st
immediate, (R10) writes an immediate number into the memory address stored in R10.
Thread A (core 1)
(R10)
(R10)
(R10)
(R10)
Thread B (core 1)
(R10)
(R10)
(R10)
(R10)
1:
0x1,
1:
Ох3,
R3,
Ох4,
ld
st
st
2: ld
R1,
2:
ld
3:
st
Ох2.
3:
st
4: ld
R2,
4:
R4,
After both threads have finished executing, you find that (R1, R2, R3, R4) = (1, 2, 3, 4). How many different
instruction interleavings of the two threads produce this result?

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