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For example, a lock file might govern access to a set of related resources, such as several different files, directories, a group of disk partitions, or selected access to higher level protocols like servers or database connections. When using lock files, care must be taken to ensure that operations are atomic. To obtain a lock, the process ...
In this solution of the readers/writers problem, the first reader must lock the resource (shared file) if such is available. Once the file is locked from writers, it may be used by many subsequent readers without having them to re-lock it again. Before entering the critical section, every new reader must go through the entry section. However ...
The read permission grants the ability to read a file. When set for a directory, this permission grants the ability to read the names of files in the directory, but not to find out any further information about them such as contents, file type, size, ownership, permissions. The write permission grants the ability to modify a file. When set for ...
Since multiple reader threads may hold the lock at once, this means that a writer thread may continue waiting for the lock while new reader threads are able to acquire the lock, even to the point where the writer may still be waiting after all of the readers which were holding the lock when it first attempted to acquire it have released the ...
A memory-mapped file is a segment of virtual memory [1] that has been assigned a direct byte-for-byte correlation with some portion of a file or file-like resource. This resource is typically a file that is physically present on disk, but can also be a device, shared memory object, or other resource that an operating system can reference through a file descriptor.
LAS VEGAS (AP) — Milwaukee coach Doc Rivers has heard and seen enough. He's convinced there will be an NBA team in Las Vegas. “Yeah, they're going to get it,” Rivers said.
Overnight Oats. On busy mornings, nothing beats overnight oats for breakfast.They’re an easy, no-bake version of classic oatmeal that only takes a few minutes to prepare. Prep them the night ...
Only one task can have a file locked for destroying at any given time, and then only if no task has the file open, locked for reading, or locked for modification. When an attempt to lock a file cannot be satisfied, the calling task will wait either indefinitely or for a specific period for another task to unlock the file, or until an attention ...