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Chapter 6 Process, Address Space is a management unit for the virtual memory of a process. It consists of non-overlapping regions accessible by the threads of the owning process. Each region has an extent (lowest virtual address and size), read/write/execute permissions for the processes threads, and whether it grows up or down. It is page oriented, and gaps are left between regions to allow for growth. Unix Address Spaces are generalization of the Unix model A heap, extensible toward higher virtual addresses, Address Space is a management unit for the virtual memory of a process. It consists of non-overlapping regions accessible by the threads of the owning process. Each region has an extent (lowest virtual address and size), read/write/execute permissions for the processes threads, and whether it grows up or down. It is page oriented, and gaps are left between regions to allow for growth. Unix Address Spaces are generalization of the Unix model A stack, extensible toward lower virtual addresses, Process and Threads Process: A typical process includes an execution environment and one or more threads. An execution environment includes an address space, thread synchronization and communication resources such as semaphores and communication interfaces such as sockets, and higher level resources such as open files and windows. Since earlier processes may have allowed only a single thread, the term multi-threaded process is often used for clarity Address Space is a management unit for the virtual memory of a process. It consists of non-overlapping regions accessible by the threads of the owning process. Each region has an extent (lowest virtual address and size), read/write/execute permissions for the processes threads, and whether it grows up or down. It is page oriented, and gaps are left between regions to allow for growth., Address Space is a management unit for the virtual memory of a process. It consists of non-overlapping regions accessible by the threads of the owning process. Each region has an extent (lowest virtual address and size), read/write/execute permissions for the processes threads, and whether it grows up or down. It is page oriented, and gaps are left between regions to allow for growth. Unix Address Spaces are generalization of the Unix model A fixed, unmodifiable text region containg program code