19 Questions
What happens in a system with no preemption if a process holding resources requests another resource that is not immediately available?
All resources currently held are released
What action is taken if a process in a system with no preemption cannot immediately access a requested resource?
Released all held resources
How can deadlock be avoided in a system where each process requests resources in an increasing order of enumeration?
By imposing a total ordering of all resource types
What additional information does a system need to have to avoid deadlocks based on the sequence of requests from active processes?
Sequence of requests associated with each active process
In what scenario can a process be restarted in a system with no preemption?
When it can regain its old resources and the new ones it requested
Which situation can lead to a deadlock in disk sharing?
Competing processes sending conflicting commands to access a disk
What can cause a deadlock in spooling?
Spooling system keeping partially completed output on disk
In the case of deadlocks in a network, what can lead to a deadlock?
All available buffer space being filled with messages
What is a common characteristic of deadlocks in multiple device allocation?
Several processes hold onto dedicated devices while others act similarly
What situation can result in a deadlock in a shared spooling system?
Printer waiting for all job's output before printing
In the context of deadlocks in disk sharing, what leads to conflicting commands?
Two processes waiting for I/O requests at different locations
What is the primary cause of deadlocks in spooling systems?
Printer requiring all job's output for printing
What can lead to deadlocks in a shared network environment?
No protocols to manage message flow
What is a characteristic of a deadlock in disk sharing?
Each process is holding a resource and waiting for another resource held by another process
In a spooling system, what happens if a program is in deadlock?
Other programs that require the resources held by the deadlock are put on hold
What can lead to a deadlock in a network?
Processes requesting access to files they cannot release
How does a deadlock in spooling differ from a deadlock in disk sharing?
In spooling, processes are blocked due to holding resources, while in disk sharing, they are blocked due to waiting for resources
What is a common characteristic of deadlocks in spooling and network deadlocks?
They both occur due to processes blocking each other while holding resources
What distinguishes deadlocks on file requests from deadlocks in databases?
File request deadlocks occur when jobs request files for execution, while database deadlocks involve processes accessing and locking records
Test your knowledge on concurrency issues in database systems, including locking, race conditions, and deadlocks. Learn about managing access to data at different levels of granularity and understanding the complexities that arise in multi-process environments.
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