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The RBITS, WBITS, and EBITS are bitmasks specifying the file descriptors that you want to monitor for reading, writing, and exceptional status, respectively You can specify any of these as undef if you are not interested in the value The bitsets are created by placing a value of 1 in each bit, with each bit number being equal to the file descriptor number (obtainable with fileno) that you want to monitor You can create this structure using vec, for example:

vec($rbits,fileno(DATA),1) = 1;

Of course, if they are using a graphical user interface, they won t type in that command but will be prompted to enter the details into a logon screen but one way or another that is the command the user process will generate It is now time to go into what actually happens when that command is processed First, break down the command into its components There is a database user name ( STORE ), followed by a database password ( ADMIN123 ), and the two are separated by a / as a delimiter Then there is an @ symbol, followed by a connect string, ORCL11G The @ symbol is an indication to the user process that a network connection is

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The TIMEOUT specifies the interval to wait for the selection to complete The select function will block until the time-out expires If TIMEOUT is 0, the effect is the same as polling in a round-robin fashion simply returning the current status without waiting The return value from the function is the number of filehandles that are waiting to be accessed, or on some platforms, it will return the number of filehandles and the time remaining on the time-out value:

class Test { public uint Process() {return(0);} }

required If the @ and the connect string are omitted, then the user process will assume that the instance you wish to connect to is running on the local machine, and that the always-available IPC protocol can be used If the @ and a connect string are included, then the user process will assume that you are requesting a network connection to an instance on a remote machine though in fact, you could be bouncing off the network card and back to the machine on to which you are logged PART I

($nfound, $timeleft) = select($rout=$rin, $wout=$win, $eout=$ein, $timeout);

The function also replaces the supplied scalar bitmasks with bitmasks defining the list of filehandles that require attention The preceding example shows the best method for using the values of the bitmasks $rin, $win, and $ein while returning the information into $rout, $wout, and $eout The problem with using most filehandles is that in order to monitor and read or write information from or to them, you need to poll each filehandle to see if it s ready This is time consuming, especially with multiple files when a good proportion of them may not be ready This is further complicated if your filehandles or network sockets are blocking (the default status) A blocking filehandle will cause a <FH> operator or a sysread function to halt execution of the program until some data is ready to be read The opposite is also true: if a filehandle or network socket is not ready to accept data, a print or syswrite function will also wait until it is ready In some situations this is ideal; in others, particularly if you are handling multiple filehandles or a user interface, this is far from ideal The solution is to use select, which reports the status of the filehandle without attempting to access it, thereby ignoring the blocking state A better alternative is to set a non-blocking operation on the filehandle using fcntl Non-blocking I/O with select works as follows: First you need to open one or more filehandles either genuine files, pipes, or network sockets and then set them to be non-blocking using fcntl:

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