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The lock-free programming is really fascinating and hateful. The blogger has previously written several articles about lock-free programming. For example, about lockless programming and concurrent data structures: Fascinating atoms. For more in-depth understanding and practice of l
Non-lock queues are becoming more and more popular, the use of different lock-free queues in specific situations can save lock overhead and improve program efficiency. The implementation of a lock-free queue in the Linux kernel is
An online 2k game, every second is scary. The traditional hibernate direct plug-in library is basically not feasible. I'm going to deduce a lock-free database operation in one step.1. How to lock in concurrency.A very simple idea to convert concurrency into a single thread. Java's disruptor is a good example. If you use the Java Concurrentcollection class to do,
If you don't know how to lock free, read my previous article. The lock free thing is really a twist and controversy. Recently, many Daniel (such as 1 and 2) have been discussing this issue. Lock free should be of no dispute regar
Tags: Lock-free, no lock, high concurrency Recently, online architecture has been implemented. The biggest difference between online architecture and offline architecture is the quality of service (SLA, service level agreement, SLA 99.99 indicates that a 10 k request may fail or times out at most once. The offline architecture is concerned with throughput, and SL
greatly reduced. In general, lock contention will lead to a reduction in CPU usage efficiency, so that the processor's IPC metrics become very low. So in the software model above, how to improve processor efficiency, give full play to the NVMe ssd performance? This requires consideration of the use of a lock-free design. In the multi-threaded concurrent proce
8. farewell to LockNot always say lock is more troublesome and dangerous, then don't be good. There is actually a lock free method.First, a concept-atomic variable is introduced. Operations on this variable are atomic operations (atomic operation). Atomic operation means that the operation is either complete or not, and partial completion is not possible. Just li
is to abort a read thread if it fails to set its hazard pointer to null, this will cause each of its hazard pointers to objects to be never released. Inspector bullet rushed into his debtor's office and immediately realized that he could not get his money back today. So he immediately said, "Dude, you are on my blacklist. I will visit you again later, unless you are dead. And even if you're 'unfortunate, the amount of debt you owe will not exceed 100. Goodbye !" References [1] Alexandrescu, And
CAS Lock-Free algorithmThere are a number of implementations to implement a lock-free-free non-blocking algorithm, where CAS (compare and exchange, Compare and swap) is a well-known lock-free
Looked at the online about the chain list of non-lock operation, writing is not clear, so that their own part of the main use of concurrent and the contract of the CAS operation.1. End of List insertionThe node to be inserted is: curTail Node: predBasic Insertion Method:do{pred = Find_tail (); Re-find tail node}(! pred.next.compareAndSet (NULL, cur)) Pred.next is null, then it points to cur, not a new node is insertedThis insertion method is not tagg
Some time ago I read about the lock-free map implementation technology, mainly using CAS, FAA and so on. If you do not know CAS and FAA, you can go to Baidu. CAS and FAA are more efficient than locks because they use the CPU features and do not need to consider the memory context during switching. Here we come up with a non-lock map implementation idea. We ca
Directory 1. Preface 2. Lock-free queue based on bidirectional linked list 2.1 Queue Method 2.2 Team-out method 3. Performance Testing 4. Summary 1. Preface If you've read this blog I wrote a few days ago to build a queue of unlocked concurrent containers (stacks and queues), I'd like to apologize to you. Because I made a low-level error when implementing the queue's Out
Yesterday I planned to rewrite the memory distributor. Previously, the memory distributor used in the system was inconvenient. I sacrificed simplicity to add the reference counting function and used some locks for thread safety. This time, all memory allocation and release are lockfree. Because memory blocks are single-chain tables, it is easier to implement lock free. It is difficult to use an array to man
Lock-free operation highlights:1. Applicable scenarios:Multiple Threads simultaneously seize the same resource and perform write (modify) operations on it. 2. Several Basic concepts:Registers: a component of a central processor. Registers are high-speed storage components with limited storage capacity. They can be used to store commands, data, and addresses. The control components of the central processor c
Next: 108 odd tricks for Linux programming-7 (lock-free experiment) This section adds the test_and_set primitive and a complete implementation of the spinlock (refer to nginx spin lock). The main change is that the _ ASM _ ("pause") command is inserted, the number of inserts is the power of the number of attempts to lock
Three application scenarios of lock free in linux 1. spin Lock: Spin lock when the Lock operation is blocked, the thread does not immediately suspend itself, but intermittently Spin (self-loop) operation to let the cpu idling to wait for other threads to release
; lru_idx]. Lock );103}104} 63 void resource_insert (resource_node_t * node)64 {65 ne_u32 hash_pos;66 re_do_list * lru_list;67 hash_pos = resource_get_hash (node). hash_pos;68 nos_spin_lock_bh ( (resource_hashtable + hash_pos)-> lock );69 ne_list_add_tail ( node-> list, (resource_hashtable + hash_pos)-> list );70 nos_spin_unlock_bh ( (resource_hashtable + hash_pos)-> l
C ++ boost library lock-free queue multi-thread parallel testing and compilation methods I read the source code about the unlock queue of the Boost library on the network, but there is no compilation method. After testing, the methods for compiling the boost library in ubuntu 14.04 are determined. Free-lock is an impor
Address: http://www.cnblogs.com/chencheng/p/3527692.html implementation of a lock-free queue-loop array Lock-Free design via CAS operation: CAS Atomic operations (Compare Set): Contains three operands, memory value V, the old expected value Oldval, the new value to modify newval, and changes memory V to newval only i
LockLocks are the simplest way to do concurrency, and the cost is the highest, Java Before JDK1.5 is guaranteed by the Synchronized keyword to ensure that synchronization, he is an exclusive lock, using synchronized synchronization lock for thread blocking and wake-up switching and user-state kernel state switching operation additional waste of CPU resources, locks there are other shortcomings, when a threa
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