Understanding Deadlocks in Operating Systems
Learn about deadlocks in operating systems, when a process is stuck waiting for a resource held by another process. Explore the causes, consequences, and solutions to prevent deadlocks in system operations.
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Presentation Transcript
Deadlocks prepared and instructed by Shmuel Wimer Eng. Faculty, Bar-Ilan University November 2016 Deadlocks 1
System Model A Deadlock occurs when a process is waiting for a resource forever because that resource is held by another waiting process. A process utilizes a resource in the following sequence: 1. Request. If the request cannot be granted immediately it must wait until it can acquire it. 2. Use 3. Release Resources examples: request() / release() device, open() / close() file, allocate() / free() memory, wait() / signal() semaphores, acquire() / release() mutexlock. November 2016 Deadlocks 2
The OS makes sure that the process has requested and has been allocated the resource. System table records whether each resource is free or allocated and the process to which it is allocated. Process requesting a currently allocated resource is added to a waiting queue for this resource. November 2016 Deadlocks 3
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