12-18-2002
Count Number Of Threads in a Process
I am trying to find out that how many number of threads are currently running or in any other state which is created by POSIX standard in a process.
First I have defined a variable called proc_var of type proc defined in sys/proc.h.Next I open up the dir /proc and per directory wise I do an ioctl operation with cmd type PIOCPSINFO and target as address space of proc_var. But when I print the value of the member variable p_lwpcnt of proc_var ( i am not sure wether i am reffering to the correct one ) , i get output '6488064' as its value.I found out that the process is a user created one and the code creates only four threads.
Kindly guide me how to find the correct number Threads and its details, currently executing in a process.
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LEARN ABOUT REDHAT
tcl_createtimerhandler
Tcl_CreateTimerHandler(3) Tcl Library Procedures Tcl_CreateTimerHandler(3)
__________________________________________________________________________________________________________________________________________________
NAME
Tcl_CreateTimerHandler, Tcl_DeleteTimerHandler - call a procedure at a given time
SYNOPSIS
#include <tcl.h>
Tcl_TimerToken
Tcl_CreateTimerHandler(milliseconds, proc, clientData)
Tcl_DeleteTimerHandler(token)
ARGUMENTS
int milliseconds (in) How many milliseconds to wait before invoking proc.
Tcl_TimerProc *proc (in) Procedure to invoke after milliseconds have elapsed.
ClientData clientData (in) Arbitrary one-word value to pass to proc.
Tcl_TimerToken token (in) Token for previously created timer handler (the return value from some previous call to Tcl_Cre-
ateTimerHandler).
_________________________________________________________________
DESCRIPTION
Tcl_CreateTimerHandler arranges for proc to be invoked at a time milliseconds milliseconds in the future. The callback to proc will be
made by Tcl_DoOneEvent, so Tcl_CreateTimerHandler is only useful in programs that dispatch events through Tcl_DoOneEvent or through Tcl
commands such as vwait. The call to proc may not be made at the exact time given by milliseconds: it will be made at the next opportunity
after that time. For example, if Tcl_DoOneEvent is not called until long after the time has elapsed, or if there are other pending events
to process before the call to proc, then the call to proc will be delayed.
Proc should have arguments and return value that match the type Tcl_TimerProc:
typedef void Tcl_TimerProc(ClientData clientData);
The clientData parameter to proc is a copy of the clientData argument given to Tcl_CreateTimerHandler when the callback was created. Typi-
cally, clientData points to a data structure containing application-specific information about what to do in proc.
Tcl_DeleteTimerHandler may be called to delete a previously created timer handler. It deletes the handler indicated by token so that no
call to proc will be made; if that handler no longer exists (e.g. because the time period has already elapsed and proc has been invoked
then Tcl_DeleteTimerHandler does nothing. The tokens returned by Tcl_CreateTimerHandler never have a value of NULL, so if NULL is passed
to Tcl_DeleteTimerHandler then the procedure does nothing.
KEYWORDS
callback, clock, handler, timer
Tcl 7.5 Tcl_CreateTimerHandler(3)