Multi-Core Lock Implementations Overview
Explore a series of lock implementations for multi-core systems, including versions utilizing atomic operations and thread queues. Learn about different approaches to managing locks in parallel processing environments to ensure efficient and safe concurrency control.
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Uniprocessor Lock Implementation class Lock { Lock() {} bool locked = false; ThreadQueue q; }; void Lock::unlock() { intrDisable(); if (q.empty() { locked = false; } else { unblockThread(q.remove()); } intrEnable(); } void Lock::lock() { intrDisable(); if (!locked) { locked = true; } else { q.add(currentThread); blockThread(); } intrEnable(); } CS 111 Lecture Notes: Lock Implementation Slide 1
Uniprocessor Lock Implementation?? class Lock { Lock() {} bool locked = false; ThreadQueue q; }; void Lock::unlock() { intrDisable(); if (q.empty() { locked = false; } else { unblockThread(q.remove()); } intrEnable(); } void Lock::lock() { intrDisable(); if (!locked) { locked = true; intrEnable(); } else { q.add(currentThread); intrEnable(); blockThread(); } } CS 111 Lecture Notes: Lock Implementation Slide 2
Locks for Multi-Core, v1 class Lock { Lock() {} std::atomic<bool> locked(false); }; void Lock::unlock() { locked = false; } void Lock::lock() { while (locked.exchange(true)) { /* Do nothing */ } } CS 111 Lecture Notes: Lock Implementation Slide 3
Locks for Multi-Core, v2 class Lock { Lock() {} std::atomic<bool> locked(false); ThreadQueue q; }; void Lock::unlock() { if (q.empty() { locked = false; } else { unblockThread(q.remove()); } } void Lock::lock() { if (locked.exchange(true)) { q.add(currentThread); blockThread(); } } CS 111 Lecture Notes: Lock Implementation Slide 4
Locks for Multi-Core, v3 class Lock { Lock() {} bool locked = false; ThreadQueue q; std::atomic<bool> spinlock; }; void Lock::unlock() { while (spinlock.exchange(true)) { /* Do nothing */ } if (q.empty() { locked = false; } else { unblockThread(q.remove()); } spinlock = false; } void Lock::lock() { while (spinlock.exchange(true)) { /* Do nothing */ } if (!locked) { locked = true; spinlock = false; } else { q.add(currentThread); spinlock = false; blockThread(); } } CS 111 Lecture Notes: Lock Implementation Slide 5
Locks for Multi-Core, v4 class Lock { Lock() {} bool locked = false; ThreadQueue q; std::atomic<bool> spinlock; }; void Lock::unlock() { while (spinlock.exchange(true)) { /* Do nothing */ } if (q.empty() { locked = false; } else { unblockThread(q.remove()); } spinlock = false; } void Lock::lock() { while (spinlock.exchange(true)) { /* Do nothing */ } if (!locked) { locked = true; spinlock = false; } else { q.add(currentThread); currentThread->state = BLOCKED; spinlock = false; redispatch(); } } CS 111 Lecture Notes: Lock Implementation Slide 6
Locks for Multi-Core, v5 class Lock { Lock() {} bool locked = false; ThreadQueue q; std::atomic<bool> spinlock; }; void Lock::unlock() { intrDisable(); while (spinlock.exchange(true)) { /* Do nothing */ } if (q.empty() { locked = false; } else { unblockThread(q.remove()); } spinlock = false; intrEnable(); } void Lock::lock() { intrDisable(); while (spinlock.exchange(true)) { /* Do nothing */ } if (!locked) { locked = true; spinlock = false; } else { q.add(currentThread); currentThread->state = BLOCKED; spinlock = false; redispatch(); } intrEnable(); } CS 111 Lecture Notes: Lock Implementation Slide 7
