March 2003
Intermediate to advanced
912 pages
27h 17m
English
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13.6. Examples from classical UNIX
The UNIX process structure was described briefly in Section 9.3. Each process runs in a separate address space, but the UNIX kernel occupies part of every process's address space. When a process makes a system call and enters the kernel its status changes from user mode to system mode and it begins to execute kernel code, as shown in Figure 13.4. A process is quite likely to wait for an event while in the kernel or to access some system data structure. At any time a number of (system mode) processes may have entered the kernel. The shared memory methods of IPC discussed in Chapters 10, 11 and 12 are relevant here; that is, UNIX processes cannot share data when they are in user mode but they can share data when ...
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