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Special Forums News, Links, Events and Announcements Software Releases - RSS News Prex 0.7.0 (Default branch)
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Old 12-26-2007
Prex 0.7.0 (Default branch)
Image Prex is a portable real-time operating system for embedded systems. The small, reliable, and low power kernel is written in the C language based on microkernel design. The file system, Unix process, and networking features are provided by user mode tasks. License: BSD License (revised) Changes:
This release adds a POSIX layer on top of the Microkernel. Tiny Unix utilities (CmdBox) and embedded Libc were also added.Image

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LEARN ABOUT HPUX

ksi_send_max

ksi_send_max(5) 						File Formats Manual						   ksi_send_max(5)

NAME

       ksi_send_max - limit on number of queued signals per process

VALUES

   Default
   Allowed Values
DESCRIPTION

       is  the	per process limit on the number of queued signals that can be posted by a sender and currently pending at receivers.  The enforced
       limit is per process sender based.  ksi stands for "kernel signal information" and identifies entries with information  about  queued  sig-
       nals.   There  is one per queued signal.  Queued signals are used by the system call, timer expiration, POSIX real time message queues, and
       asynchronous I/O.  User generated signals (via and are not queued.

   Who Is Expected to Change This Tunable?
       Anyone.

   Restrictions on Changing
       Changes to this tunable take effect at the next reboot.

   When Should the Value of This Tunable Be Raised?
       Frequent or heavy use of facilities which use queued signals, may require raising this value.  When is returned by  the	system	call,  the
       tunable should be raised.

   What Are the Side Effects of Raising the Value?
       Increased memory usage, but only if used.  Every allocated entry is 96 bytes.

   When Should the Value of This Tunable Be Lowered?
       Only to control the applications' usage of queued signals.

   What Are the Side Effects of Lowering the Value?
       If too low, failure of applications using queued signals may fail.

   What Other Tunable Values Should Be Changed at the Same Time?
       to  limit  the  number  of  queued  signals  system-wide.  Since is per system based and is per process based, the tunable should always be
       greater.

       Note that the default value for is and for is

WARNINGS

       All HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases	of
       HP-UX.

       Installation  of  optional  kernel  software, from HP or other vendors, may cause changes to tunable parameter values.  After installation,
       some tunable parameters may no longer be at the default or recommended values.  For information about the effects of installation  on  tun-
       able  values,  consult  the documentation for the kernel software being installed.  For information about optional kernel software that was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

SEE ALSO

       kill(2), sigqueue(2), ksi_alloc_max(5).

							     Tunable Kernel Parameters						   ksi_send_max(5)