Single-Core Lock Implementation
This technical content discusses lock implementation for single-core and multi-core systems, covering various versions and scenarios. It includes code snippets, struct definitions, and methods for acquiring and releasing locks in a synchronized manner. The slides illustrate different approaches to ensure data integrity and prevent race conditions in concurrent programming.
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Presentation Transcript
Single-Core Lock Implementation void lock_acquire(struct lock *l) { intr_disable(); if (!l->locked) { l->locked = 1; } else { queue_add(&l->q, thread_current()); thread_block(); } intr_enable(); } struct lock { int locked; struct queue q; }; void lock_release(struct lock *l) { intr_disable(); if (queue_empty(&l->q) { l->locked = 0; } else { thread_unblock(queue_remove(&l->q)); } intr_enable(); } CS 140 Lecture Notes: Lock Implementation Slide 1
Locks for Multi-Core, v1 struct lock { int locked; }; void lock_release( struct lock *l) { l->locked = 0; } void lock_acquire( struct lock *l) { while (swap(&l->locked, 1)) { /* Do nothing */ } } CS 140 Lecture Notes: Lock Implementation Slide 2
Locks for Multi-Core, v2 struct lock { int locked; struct queue q; }; void lock_release( struct lock *l) { if (queue_empty(&l->q) { l->locked = 0; } else { thread_unblock( queue_remove(&l->q)); } } void lock_acquire( struct lock *l) { if (swap(&l->locked, 1)) { queue_add(&l->q, thread_current()); thread_block(); } } CS 140 Lecture Notes: Lock Implementation Slide 3
Locks for Multi-Core, v3 struct lock { int locked; struct queue q; int sync; }; void lock_release( struct lock *l) { while (swap(&l->sync, 1)) { /* Do nothing */ } if (queue_empty(&l->q) { l->locked = 0; } else { thread_unblock( queue_remove(&l->q)); } l->sync = 0; } void lock_acquire( struct lock *l) { while (swap(&l->sync, 1)) { /* Do nothing */ } if (!l->locked) { l->locked = 1; l->sync = 0; } else { queue_add(&l->q, thread_current()); l->sync = 0; thread_block(); } } CS 140 Lecture Notes: Lock Implementation Slide 4
Locks for Multi-Core, v4 struct lock { int locked; struct queue q; int sync; }; void lock_release( struct lock *l) { while (swap(&l->sync, 1)) { /* Do nothing */ } if (queue_empty(&l->q) { l->locked = 0; } else { thread_unblock( queue_remove(&l->q)); } l->sync = 0; } void lock_acquire( struct lock *l) { while (swap(&l->sync, 1)) { /* Do nothing */ } if (!l->locked) { l->locked = 1; l->sync = 0; } else { queue_add(&l->q, thread_current()); thread_block(&l->sync); } } CS 140 Lecture Notes: Lock Implementation Slide 5
Locks for Multi-Core, v5 struct lock { int locked; struct queue q; int sync; }; void lock_release( struct lock *l) { intr_disable(); while (swap(&l->sync, 1)) { /* Do nothing */ } if (queue_empty(&l->q) { l->locked = 0; } else { thread_unblock( queue_remove(&l->q)); } l->sync = 0; intr_enable(); } void lock_acquire( struct lock *l) { intr_disable(); while (swap(&l->sync, 1)) { /* Do nothing */ } if (!l->locked) { l->locked = 1; l->sync = 0; } else { queue_add(&l->q, thread_current()); thread_block(&l->sync); } intr_enable(); } CS 140 Lecture Notes: Lock Implementation Slide 6
