Are Linux signals queued?

Are Linux signals queued?

Standard signals do not queue. If multiple instances of a standard signal are generated while that signal is blocked, then only one instance of the signal is marked as pending (and the signal will be delivered just once when it is unblocked).

Can Sigkill be masked?

It is not possible to block SIGKILL or SIGSTOP. Attempts to do so are silently ignored. Each of the threads in a process has its own signal mask. If SIGBUS, SIGFPE, SIGILL, or SIGSEGV are generated while they are blocked, the result is undefined, unless the signal was generated by kill(2), sigqueue(3), or raise(3).

How do I check my MQ queue depth?

How do I query the WebSphere MQ queue depth, messages on queues, or queues?

1. Log on as user fmc (when using a default installation)
2. Start the FMCQM queue manager (“strmqm FMCQM”)
3. Run the command processor (“runmqsc FMCQM”)
4. Enter “dis ql (RTSINPUTQ) all” (shows the amount of elements in the fmcemain input queue)

What is Sigquit on Linux?

The default action for SIGINT, SIGTERM, SIGQUIT, and SIGKILL is to terminate the process. However, SIGTERM, SIGQUIT, and SIGKILL are defined as signals to terminate the process, but SIGINT is defined as an interruption requested by the user.

How to NOTIFY message queue descriptor in Linux?

NOTIFY Notification method: 0 is SIGEV_SIGNAL; 1 is SIGEV_NONE ; and 2 is SIGEV_THREAD . SIGNO Signal number to be used for SIGEV_SIGNAL . Linux implementation of message queue descriptors On Linux, a message queue descriptor is actually a file descriptor.

How to display the current disk IO queue length on Linux?

You actually want iostat -x which will display the extended stats for the device in question since last iostat was run. If you wish to monitor the queue in realtime you want iostat -xt 1 (or iostat -xmt 1 to show details in megabytes).

Which is an example of a message queue in Linux?

This behavioral regression was rectified in Linux 4.2 (and earlier stable kernel series), so that the count once more included just the bytes of user data in messages in the queue. An example of the use of various message queue functions is shown in mq_notify (3). This page is part of release 5.05 of the Linux man-pages project.

What is the disposition of signal in Linux?

It is possible to arrange that the signal handler uses an alternate stack; see sigaltstack (2) for a discussion of how to do this and when it might be useful. The signal disposition is a per-process attribute: in a multithreaded application, the disposition of a particular signal is the same for all threads.