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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. A process can also be paused with the "stop" signal (SIGSTOP), which cannot be caught or ignored.
It is mostly used by device drivers waiting for disk or network IO (input/output). When the process is sleeping uninterruptibly, signals accumulated during the sleep will be noticed when the process returns from the system call or trap. In Unix-like systems the command 'ps -l' uses code "D" for the uninterruptible sleep state of a process. [9]
The SIGSEGV signal is sent to a process when it makes an invalid virtual memory reference, or segmentation fault, i.e. when it performs a segmentation violation. [19] SIGSTOP The SIGSTOP signal instructs the operating system to stop a process for later resumption. SIGSYS The SIGSYS signal is sent to a process when it passes a bad argument to a ...
The sleep instruction suspends the calling process for at least the specified number of seconds (the default), minutes, hours or days. sleep for Unix-like systems is part of the X/Open Portability Guide since issue 2 of 1987. It was inherited into the first version of POSIX and the Single Unix Specification. [1] It first appeared in Version 4 ...
It is also sometimes simply referred to as a pause. More generally, a breakpoint is a means of acquiring knowledge about a program during its execution. During the interruption , the programmer inspects the test environment ( general-purpose registers , memory , logs, files , etc.) to find out whether the program is functioning as expected.
It was introduced in Solaris 7 and has since been reimplemented for Linux, NetBSD and OpenBSD. pkill makes killing processes based on their name much more convenient: e.g. to kill a process named firefox without pkill (and without pgrep), one would have to type kill `ps --no-headers -C firefox -o pid` whereas with pkill, one can simply type ...
Some of the first 100 MHz DX chips had a buggy HLT state, prompting the developers of Linux to implement a "no-hlt" option for use when running on those chips, [4] but this was fixed in later chips. Intel has since introduced additional processor-yielding instructions. These include: PAUSE in SSE2 intended for spin loops. Available to userspace ...
; XACQUIRE hints to the processor that we are acquiring a lock. je out; If we locked it (old value equal to EAX: 0), return. pause: mov eax, [locked]; Read locked into EAX. test eax, eax; Perform the zero-test as before. jz retry; If it's zero, we can retry. rep nop; Tell the CPU that we are waiting in a spinloop, so it can; work on the other ...