Definition
Integrated Deadlock Strategy
An integrated deadlock strategy manages deadlocks by grouping resources into classes and applying the most suitable technique (prevention, avoidance, or detection) to each class.
Implementation
Resource Classification
Group resources into classes:
- Swappable Space: Secondary storage for swapping
- Process Resources: I/O devices and files
- Main Memory: Physical RAM pages
Global Prevention
Assign a linear ordering to resource classes. A process can only request resources from a class if it holds none from a higher-ordered class. This prevents circular wait between classes.
Local Strategies
Apply class-specific internal strategies:
- Main Memory: Preemption via swapping
- Process Resources: Avoidance (e.g., Banker’s algorithm)
- Swappable Space: Prevention by requiring full allocation upfront
Properties
Performance
Tailoring strategies to resource characteristics maintains high system performance and parallelism.
Robustness
Provides a robust guarantee against total system deadlock.