By John O'Gorman
The Linux procedure Manager is a line-by-line clarification of the subset of the Linux resource code kernel which bargains with technique administration, overlaying:
- process construction, scheduling and termination
- synchronisation, together with locks and semaphores
- interrupts (hardware and software program)
- signal dealing with
This essential consultant to the kernel subset is geared toward readers with a few prior wisdom of working method constitution and terminology, in addition to a minimal wisdom of the c program languageperiod. the excellent index which lists each identifier, makes in-depth details immediately on hand to programmers, software program engineers, process directors and someone who desires to alter the kernel, or desires to learn about the consequences of kernel configuration variables.
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Extra resources for The Linux Process Manager. The Internals of Scheduling, Interrupts and Signals
424 this bit indicates that if the process terminates abnormally, it is to produce a core image on disk. It is set by functions that implement exec(). 4). 426–428 these bits are set and tested by various routines within the memory manager. They will not be considered any further here. 429 when this bit is set, the process does not generate any further I/O. As this is the province of the I/O manager, it will not be considered further in this book. 2), and is afterwards manipulated only by architecture-specific code.
10). 10 Process credentials and limits Line 368: uid, euid, suid, fsuid These are the user identifiers associated with the process. The operating system uses these IDs to determine whether or not to grant a process access to specific system resources. The real user ID (uid), that is the ID of the user that created the process, is in uid. The effective uid (euid) is in euid; effective IDs can be acquired temporarily. The saved uid is suid, and the uid used for file access is in fsuid. When a program is run, its effective uid is saved to its suid.
14 Line 387: thread There is really no fundamental distinction between the terms ‘task’, ‘process’, and ‘thread’ in Linux. However, the sources do seem to reserve the identifier ‘thread’ for architecturespecific details. , shows the thread_struct used with the i386 architecture. This contains all the state information that must be saved when a process is context switched out. Context switches always occur in kernel mode. Most of the hardware register values have already been saved on entry to the kernel.