probing disks

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LEARN ABOUT SUNOS

tnf_process_enable

tnf_process_disable(3TNF)				       TNF Library Functions					 tnf_process_disable(3TNF)

NAME

       tnf_process_disable, tnf_process_enable, tnf_thread_disable, tnf_thread_enable - probe control internal interface

SYNOPSIS

       cc [ flag ... ] file ... -ltnfprobe [ library ... ]
       #include <tnf/probe.h>

       void tnf_process_disable(void);

       void tnf_process_enable(void);

       void tnf_thread_disable(void);

       void tnf_thread_enable(void);

DESCRIPTION

       There  are  three  levels  of granularity for controlling tracing and probe functions (called probing from here on): probing for the entire
       process, a particular thread, and the probe itself can be disabled or enabled.  The first two (process and thread) are controlled  by  this
       interface.  The probe is controlled with the prex(1) utility.

       The  tnf_process_disable()  function  turns  off  probing  for  the  process.  The  default  process  state is to have probing enabled. The
       tnf_process_enable() function turns on probing for the process.

       The tnf_thread_disable() function turns off probing for the currently running thread.  Threads  are  "born"  or	created  with  this  state
       enabled.  The  tnf_thread_enable()  function  turns on probing for the currently running thread.  If the program is a non-threaded program,
       these two thread interfaces disable or enable probing for the process.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWtnfd			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Unstable			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       prex(1), tnfdump(1), TNF_DECLARE_RECORD(3TNF), TNF_PROBE(3TNF), attributes(5)

NOTES

       A probe is considered enabled only if:

	 o  prex(1) has enabled the probe AND

	 o  the process has probing enabled, which is the default or could be set with tnf_process_enable() AND

	 o  the thread that hits the probe has probing enabled, which is every thread's default or could be set with tnf_thread_enable().

       There is a run time cost associated with determining that the probe is  disabled.  To reduce the performance effect of  probes,	this  cost
       should  be  minimized.  The quickest way that a probe can be determined to be disabled is  by the enable control that prex(1) uses.  There-
       fore, to disable all the probes in a process use the disable command in prex(1) rather than tnf_process_disable().

       The tnf_process_disable() and tnf_process_enable() functions should only be used to toggle probing based on some  internal  program  condi-
       tion. The tnf_thread_disable() function should be used to turn off probing for threads that are uninteresting.

SunOS 5.10							    5 Feb 2002						 tnf_process_disable(3TNF)

Solaris