the use of locks with different forms, mechanisms and applications has been common for a long time in iran. among these locks we can point out the pendant combinated lock, in which two mechanisms are used simultaneously in a single body. employing a descriptive – analytical method, this study searches the reasons of using two mechanisms in these locks. problems such as: the use of these locks, ...

In most C++-based OODBMSs, the concurrency control has been implemented by using the locking mechanism. However, application programmers for those databases should be involved in locking the objects that would be accessed from their applications. So they had to spend a lot of time on issuing locks, and thus the productivity of application development has become poor. This paper presents a mecha...

We report on the issues raised when designing a customizable locking mechanism for Persistent Java, a type-safe, object-oriented, orthogonally persistent system based on the language Java. Customizable locking mechanisms are supported by locking capabilities. A locking capability is a book-keeper of locks that automatically acquires locks with a customizable connict detection mechanism. It impl...

There are many mechanisms for concurrency control in high-level programming languages. In Java, the original mechanism for concurrency control, based on synchronized blocks, is lexically scoped. For more flexible control, Java 5 introduced non-lexical operators, supporting lock primitives on re-entrant locks. These operators may lead to run-time errors and unwanted behavior; e.g., taking a lock...

The past few years have marked the start of a historic transition from sequential to parallel computation. The necessity to write parallel programs is increasing as systems are getting more complex while processor speed increases are slowing down. Current parallel programming uses low-level programming constructs like threads and explicit synchronization using locks to coordinate thread executi...

The first paper [2] discusses software locking mechanisms that commonly protect shared resources for multi-threaded applications. This mechanism can, especially in chip-multiprocessor systems, result in a large synchronization overhead. For real-time systems in particular, this overhead increases the worstcase execution time and may void a task set's schedulability. This paper presents two hard...