atomic

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What is the advantage of using the class Unsafe to write atomics over synchronize blocks?

why java Atomics uses sun Unsafe class rather than usi开发者_开发知识库ng synchronize block/volatile?synchronization is much more heavy weight.[详细]

2023-03-28 19:52 分类：问答
compare-and-swap atomic operation vs Load-link/store-conditional operation

Under an x86 processor I am not sure of the difference between compare-and-swap atomic operation and Load-link/store-condition开发者_开发知识库al operation. Is the latter safer than the former? Is it[详细]

2023-03-28 19:32 分类：问答
How to model a situation, when i++ is corrupted by simultaneously executing threads?

If int incrementing/decrementing operations are not atomic in Java 6, that is, they are said to be performed in several steps (read the value, increment, write etc), I would like to see a piece of cod[详细]

2023-03-27 09:13 分类：问答
Are volatile reads and writes atomic on Windows+VisualC?

There are a couple of questions on this site asking whether using a volatile variable for atomic / multithreaded access is possible: See here, here, or here for example.[详细]

2023-03-27 03:54 分类：问答
Redis Multi Ensuring Atomicity

Is there a way in redis to make all commands in a \'multi\' transaction fail if one command fails. eg.[详细]

2023-03-27 03:13 分类：问答
PHP -MySQL insert and select statements - how to make them atomic?

Im new to PHP and I was wondering how I can overcome this seemingly simple problem: I have a database with several tables. Of them 1 table is called \"order_header\". Order header has a field called[详细]

2023-03-26 07:24 分类：问答
How to atomically move rows from one table to another?

I am collecting readings from several thousand sensors and storing them in a MySQL database. There are several hundred inserts per second. To improve the insert performance I am storing the values ini[详细]

2023-03-25 03:18 分类：问答
Atomic operations: under the hood

How do atomic operations work, under the hood? Are atomic operations so-called \"wait-free\"? I\'m seeking for a description of the \"least c开发者_Python百科ommon divisor\" of atomic operations. Wh[详细]

2023-03-24 03:07 分类：问答
User input validation and database constraints

Assume we have the following database structure and accompanying web page: The database consists of two tables, t1 and t2. The table t2 consists of two columns, one is called id_bar which is just a u[详细]

2023-03-22 14:38 分类：问答
Does anyone know if xcache functions are atomic?

I\'m wondering which xcache funct开发者_C百科ions are atomic. I know that xcache_inc() and xcache_dec() are both atomic. I dont know if xcache_get() and xcache_unset() are atomic.The Feature List says[详细]

2023-03-22 07:32 分类：问答