Definition
Integrated Deadlock Strategy
An integrated deadlock strategy is a comprehensive approach to managing deadlocks by grouping system resources into distinct classes and applying the most efficient management technique (prevention, avoidance, or detection) to each class based on its characteristics.
Implementation
The strategy typically involves the following steps:
- Resource Classification: Group resources into classes such as:
- Swappable Space: Secondary storage used for swapping.
- Process Resources: I/O devices and files.
- Main Memory: Physical RAM pages.
- Global Prevention: Assign a linear ordering to these classes. A process can only request resources from a class if it holds no resources from a higher-ordered class. This prevents circular wait between classes.
- Local Strategies: Apply internal strategies within each class:
- Main Memory: Use preemption by swapping processes to secondary storage.
- Process Resources: Use avoidance (e.g., Banker’s algorithm) because resource needs are often declared in advance.
- Swappable Space: Prevention by requiring processes to allocate all needed space at once.
Significance
By tailoring the management strategy to the specific nature of each resource, an integrated approach maintains high system performance and parallelism while providing a robust guarantee against total system deadlock.