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A handle leak is a type of software bug that occurs when a computer program asks for a handle to a resource but does not free the handle when it is no longer used. [1] If this occurs frequently or repeatedly over an extended period of time, a large number of handles may be marked in-use and thus unavailable, causing performance problems or a crash.
Typically the handle is an index or a pointer into a global array of tombstones. A handle leak is a type of software bug that occurs when a computer program does not free a handle that it previously allocated. This is a form of resource leak, analogous to a memory leak for previously allocated memory.
A very common example is failing to close files that have been opened, which leaks a file handle; this also occurs with pipes. Another common example is a parent process failing to call wait on a child process , which leaves the completed child process as a zombie process , leaking a process table entry.
These leaks can lead to performance issues, unexpected behavior, and increased cognitive load on software developers, who are forced to understand both the abstraction and the underlying details it was meant to hide. This highlights a cause of software defects: the reliance of the software developer on an abstraction's infallibility.
A re-introduction to JavaScript (JS tutorial) – when you are ready for a second go. Basic JavaScript – freeCodeCamp's 10-hour JavaScript learning track; The Modern JavaScript Tutorial – from beginning to advanced. Introduction to Object-Oriented JavaScript – from the Mozilla Developer Network; JavaScript Tutorial – from w3schools.com
The syntax of JavaScript is the set of rules that define a correctly structured JavaScript program. The examples below make use of the log function of the console object present in most browsers for standard text output .
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A memory leak has symptoms similar to a number of other problems and generally can only be diagnosed by a programmer with access to the program's source code. A related concept is the "space leak", which is when a program consumes excessive memory but does eventually release it. [3]