If multiple threads call increment() concurrently, the outcome is unpredictable. The increment operation might not be atomic (meaning it's not guaranteed to be executed as a single, indivisible step). This could lead to a race condition where the final value of count is less than the expected...
Compilers can reorder instructions for maximum throughput. Compilers won’t choose an ordering that changes the meaning of the code, but they assume that memory values are changed only when there are explicit instructions in the code. However, a memory value can be changed by another thread! If...
For the past several weeks I have been writing a synchronization library in my free time. This can be used in a distributed manner, meaning several nodes in a cluster can use this library to synchronize between each other. This implementation is based on Apache Zookeeper. Though primarily Zooke...
To better understand the usefulness of condition variables, let's look at an example where a group of workers are working on two tasks, A and B. Task B is dependent on Task A, meaning all workers must finish working on Task A before they can start working on Task B. ...
Bvckup 2 is a backup/synchronization tool that uses "delta" copy methods, meaning it only transfers changes to a file or files rather than recopying the entire set. This is frequently faster, saves bandwidth for network backups and can help flash media live longer by reducing the overall num...
For more information, see the “Managing Replication” chapter in the Sun Java System Directory Server 5 2004Q2 Administration Guide. You can useAdministrativecredentials to prepare asecondaryserver. Be sure to plan your Identity Synchronization for Windows configurationbeforerunningidsync prepdsbecause yo...
P(S); CriticalSection()//临界区 V(S); Semaphore Eliminating Busy-Waiting 去除忙等的信号量 P(S) { S--; if (S 0) { add this process to list block } } V(S) { S++; if (S = 0) { remove a process P from list wakeup(P); } } Thinking: What’s The meaning of value S?
The meaning of terms is clarified in this disclosure, so the claims should be read with careful attention to these clarifications. Specific examples are given, but those of skill in the relevant art(s) will understand that other examples may also fall within the meaning of the terms used, an...
We assume that all the agents are introspective, meaning that they have access to their own local measurements. As a special case of heterogeneous MAS, we study state and regulated state synchronization of homogeneous MAS with non-introspective agents.Liu, Zhenwei...
In that operation, a given thread attempting to begin a monitor-access operation performs a swap operation in which it replaces the synchronization-state-field contents with a "busy"-valued synchronization-state code whose meaning is that the object is what we call "meta-locked," i.e., that...