Parallel Processing Detection and Program Return Value Detection Post: 302535729

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Top Forums Programming Parallel Processing Detection and Program Return Value Detection Post 302535729 by Corona688 on Friday 1st of July 2011 01:13:50 PM

07-01-2011

Registered User

Quote:

Originally Posted by azar.zorn

is it possible to tell what created the thread or child process?

Try ps -ejT, that should print a process tree. The information ps uses to create this may be available under /proc/. For more detail than that I'd need to know what your system is.

Quote:

or follow the child/thread to find the program it is linked to?

You can do that too! If you're on Linux, strace prints all system calls the program makes as it happens, including the various clone_* ones that Linux uses to create threads or processes. (you'd want to run it with -f so it follows any children it creates in the meantime too.) I think Solaris has dtrace. Other systems I'm not sure.

How to get information on threads would be a lot more system-specific than information on processes.

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LEARN ABOUT XFREE86

vpo

VPO(4)							   BSD Kernel Interfaces Manual 						    VPO(4)

NAME

     vpo -- parallel to SCSI interface driver

SYNOPSIS

     device vpo

     For one or more SCSI busses:
     device scbus

DESCRIPTION

     The vpo driver provide access to parallel port Iomega Zip and Jaz drives.

HARDWARE

     The vpo driver supports the following parallel to SCSI interfaces:

     o	 Adaptec AIC-7110 Parallel to SCSI interface (built-in to Iomega ZIP drives)
     o	 Iomega Jaz Traveller interface
     o	 Iomega MatchMaker SCSI interface (built-in to Iomega ZIP+ drives)

USAGE

     The driver should let you use a printer connected to the drive while transferring data.

     DOS and FreeBSD file systems are supported.  When mounting a DOS file system or formating a FreeBSD file system, check the slice of the disk
     with the fdisk(8) utility.

     In order to unixify a ZIP disk, put the following in /etc/disktab:

     zip|zip 100:
	     :ty=removable:se#512:nc#96:nt#64:ns#32:
	     :pa#196608:oa#0:ba#4096:fa#512:
	     :pb#196608:ob#0:bb#4096:fb#512:
	     :pc#196608:oc#0:bc#4096:fc#512:

     and use bsdlabel(8).

     If you have trouble with your driver, your parallel chipset may not run properly at the detected mode (NIBBLE, PS2 or EPP).  Tune the ppc(4)
     bootflags to force other modes.

SEE ALSO

     da(4), lpt(4), ppbus(4), ppc(4), scsi(4)

HISTORY

     The vpo manual page first appeared in FreeBSD 3.0.

AUTHORS

     This manual page was written by Nicolas Souchu.

BUGS

     During boot, the driver first tries to detect a classic ZIP, then a ZIP+.	The ZIP+ detection is intrusive and may send erroneous characters
     to your printer if the drive is not connected to your parallel port.

BSD
								 December 14, 2004							       BSD

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