Question

• Memory Management

  1. Explain how kernel level threads in the same process are able to have shared memory. Be specific in terms of process layout and memory map.

  2. Give a possible approach for a user-level threads package to support memory needed for multiple threads without OS support. Include what parts of memory are unique per thread and what parts are shared by all threads.

Answer 1

Answer)

It is the kernel level thread in the same process are being able to have the shared memory as every process contains the unique and own address space which needs an involvement to the kernel while dealing with the other processes address space. Here, the kernel will have the knowledge of the memory mapping of every process and can also help in determining the chuck of the memory which can be used for sharing the memory among the multiple processes.

It is the user threads which are above the kernel and also made without the kernel supports where the thread of the application programmers would use the programs and has many type of mapping made for the kernel threads.

Some of the approaches are as follows:

1) Many to one Model

2) One to One Model

3) Many to Many models

The thread libraries are shared along with the implementation, global variables, heap and stack are shared whereas code, data, functionality are unique for a thread.

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