Multi threading model
- 1. MULTI THREADING MODEL By, R.Annalakshmi, 20PA03, Operating system, 1-MCA 1 11-04-2021
- 2. Types Multi Thread Model: To establish relationship between user thread and kernel thread it’s called multi threading model. Many-to-one model One-to-one model Many-to-many model 2 11-04-2021
- 3. Many-to-one model: 3 11-04-2021 • Many user level thread to one kernel level thread. • Thread management is done by the thread library in user space.so,it is efficient. • The entire process will block if a thread makes a blocking system call. • Multiple threads are unable to run in parallel of multiprocessors. • Ex: ticket booking
- 4. One-to-one model: 11-04-2021 4 • Each user thread have one kernel thread. • Provides more concurrency then the many-to-many model by allowing another thread to run when a thread makes a blocking system call. • Also multiple threads run in a parallel of multi processor. • Creating a user thread requires corresponding level of kernel thread.
- 5. Many-to-many-model: 11-04-2021 5 • Multiplexes many user-level threads to a smaller or equal number of kernel threads. • The number of kernel threads may be specific to either a particular application or a particular machine. • Also, when a thread performs a blocking system call, the kernel can schedule another thread for execution. • Ex: network
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