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A job running in the foreground can be stopped by typing the suspend character . This sends the "terminal stop" signal (SIGTSTP) to the process group. By default, SIGTSTP causes processes receiving it to stop, and control is returned to the shell. However, a process can register a signal handler for or ignore SIGTSTP.
To enable swsusp, the following should be selected during kernel configuration: Power management options → <*>Power management support (CONFIG_PM) Power management options → <*>Software Suspend (CONFIG_SOFTWARE_SUSPEND) Power management options → [/dev/resume_partition]Default resume partition (CONFIG_PM_STD_PARTITION)
A process can define how to handle incoming POSIX signals. If a process does not define a behaviour for a signal, then the default handler for that signal is being used. The table below lists some default actions for POSIX-compliant UNIX systems, such as FreeBSD, OpenBSD and Linux.
System Management Mode (SMM, sometimes called ring −2 in reference to protection rings) [1] [2] is an operating mode of x86 central processor units (CPUs) in which all normal execution, including the operating system, is suspended.
the execution of a coroutine is suspended as control leaves it, only to carry on where it left off when control re-enters the coroutine at some later stage. Besides that, a coroutine implementation has 3 features: the control-transfer mechanism. Asymmetric coroutines usually provide keywords like yield and resume. Programmers cannot freely ...
For example, one background process may be designed to accept incoming e-mails, sleeping most of the day but suddenly springing to life when an incoming e-mail arrives. An alternative background process could be designed to accept incoming requests for web pages hosted on the machine, waking up only when a request arrives to service it.
A process control block (PCB), also sometimes called a process descriptor, is a data structure used by a computer operating system to store all the information about a process. When a process is created (initialized or installed), the operating system creates a corresponding process control block, which specifies and tracks the process state (i ...
The period of time for which a process is allowed to run in a preemptive multitasking system is generally called the time slice or quantum. [1]: 158 The scheduler is run once every time slice to choose the next process to run. The length of each time slice can be critical to balancing system performance vs process responsiveness - if the time ...