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public static long Value { get { long count = 0; QueryPerformanceCounter(ref count); return count; } } [System.Runtime.InteropServices.DllImport("KERNEL32", CharSet=System.Runtime.InteropServices.CharSet.Auto)] private static extern bool QueryPerformanceCounter( ref long lpPerformanceCount); [System.Runtime.InteropServices.DllImport("KERNEL32", CharSet=System.Runtime.InteropServices.CharSet.Auto)] private static extern bool QueryPerformanceFrequency( ref long lpFrequency); } public struct Point { public Point(int x, int y) { this.x = x; this.y = y; } // safe version public static Point[] ClonePointArray(Point[] a) { Point[] ret = new Point[a.Length]; for (int index = 0; index < a.Length; index++) ret[index] = a[index]; return(ret); } // unsafe version using pointer arithmetic unsafe public static Point[] ClonePointArrayUnsafe(Point[] a) { Point[] ret = new Point[a.Length]; // a and ret are pinned; they cannot be moved by // the garbage collector inside the fixed block.

As a general rule, dynamic registration is a better option, but there are circumstances when you will resort to static registration Dynamic registration was introduced with release 8i, but if you have older databases that your listener must connect users to, you will have to register them statically Also some applications may require static registration: typically management tools To register an instance statically, add an appropriate entry to the listenerora file:

The real user ID (uid) of the current process This is the user ID of the user who executed the process, even if running setuid

Then, once the files are open and ready for access, you need to create the necessary bitsets for use with the select function Since we re only reading from a pipe, we really only need to create the RBITS bitset, but this example shows creation of all three for clarity:

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LIST2 = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 127001)(PORT = 1522)) ) ) SID_LIST_LIST2 = (SID_LIST = (SID_DESC = (ORACLE_HOME = /u01/oracle/app/product/1110/db_1) (SID_NAME = ocp11g) ) )

$rbits = $wbits = $ebits = ''; vec($rbits, fileno(DATA), 1) = 1; vec($wbits, fileno(DATA), 1) = 1; $ebits = $rbits | $wbits;

This entry will configure the listener called LIST2 to accept connection requests for an instance called ocp11g It says nothing about whether the instance is running or even exists at all The directive ORACLE_HOME is only required if the database listener is not running from the same Oracle Home as the instance If this is the case, then this directive will let the listener find the executable file that it must run to launch a server process Usually, this is only necessary if configuring a listener to make connections to instances of a different version, which have to be running off a different home

You re now ready to start checking the status of the filehandles you want to monitor Typically of course you d do this in a loop as part of the main execution process, but for this example, we ll simply check the status once:

CHAPTER 38 DEEPER INTO C#

$nfound = select($rreq = $rbits, $wreq = $wbits, $ereq = $ebits, 0); print "$nfound filehandle(s) waiting for input\n"; print "Expecting input from 'ls' command\n" if ($rreq && fileno(DATA));

This is the preferred method by which an instance will register with a listener The initialization parameter local_listener tells the instance the network address that it should contact to find a listener with which to register At instance startup time, the PMON process will use this parameter to locate a listener, and inform it of the instance s name and the names of the service(s) that the instance is offering The instance name is defined by the instance_name parameter, and the service_names parameter will have defaulted to this suffixed by the db_domain parameter, which will default to null It is possible to create and start additional services at any time, either by changing the value of the service_names parameter (which can be a comma-delimited list, if the instance is to offer several services) or programmatically using the DBMS_SERVICE package Any change to the services must be registered with the local listener If this is not done, the listener won t know what services are being offered, and will therefore not

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