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This supports file locking on the specified FILEHANDLE using the system flock(), fcntl() locking, or lockf(), in that order of preference The exact implementation used is dependent on what your system supports OPERATION is one of the static scalar values defined in Table 7-10, which can be obtained from the Fcntl module, although you must specify the symbols you want to import:

__________________ Nameable { __________________ } class Animal _____________ { ________________________ _______________________ } public class Buddies ________________ { ________________________ public static void main(String[] args) { Animal b1 = new Animal("Kara"); _____________________________________ Systemoutprintln(b1getName() + " " + } }

use Fcntl qw/LOCK_SH LOCK_EX LOCK_UN LOCK_NB/;

Here is an example of locking a mailbox before writing:

use Fcntl; flock DATA, LOCK_EX; print DATA $message; flock DATA, LOCK_UN;

b2getName());

Note that flock will block process execution until such time as the requested lock can be achieved The way to get around this is to use $LOCK_NB, which attempts to lock the filehandle without blocking However, caution should be used here: you must

LOCK_SH LOCK_EX LOCK_UN LOCK_NB Table 7-10

7:

Fragments:

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make sure you test the result of the lock before you start using the file When using $LOCK_NB, the result from flock will be true, irrespective of whether the lock succeeded In nearly all cases file locking is generally advisory, that is, the fact the lock has been set does not guarantee that another application will not be able to access or overwrite the file This is because all applications that use the file need to use the same file locking mechanism This is especially true if the underlying implementation is through the flock() function because of the way in which flock() sets its locks You should also be aware that it is unlikely that flock will work over a networked file system If you want to force the use of fcntl, you will need to use it directly; so the equivalent of the earlier example becomes

use Fcntl qw/F_SETLK LOCK_EX LOCK_UN/; fcntl(DATA,&F_SETLK,LOCK_EX); print DATA $message; fcntl(DATA,&F_SETLK,LOCK_UN);

Another alternative is to use a separate file with a lck or similar extension and check for that during execution This only works if all processes are aware of the method of locking you are using Both flock and fcntl have the advantage that they are operating system functions, so the information and locks are shared across the whole operating system In theory this means that a C program that uses file locking will also be aware of the locks imposed by a Perl script It also means that all the operating system commands will also be aware of the locks imposed on different files Of course, the exact system you use will often rely on the supported options for the platform you are using; fcntl is the most supported cross-platform solution

8

interface String name; abstract class Animal() { name = "Charis"; } Animal(String n) { name = n; } Buddies(String s) { super(); }

$result = 3+4; $ftoc = (212-32)*(5/9); $square = 16*2;

Use PHP s number_format() function:

Beyond these basic operators, Perl also supports a number of functions that fill in the gaps Without exception, all of these functions automatically use the value of $_ if you fail to specify a variable on which to operate

When you are concerned only with magnitude for example, when comparing the size of two objects the designation of negative or positive is not required You can use the abs function to return the absolute value of a number:

Buddies b2 = new Buddies(); Buddies(String s) { super(s); } String getName() { return name; } Buddies b2 = new Buddies("Charis"); void Animal(String n) { name = n; } void Buddies(String s) { super(s); }

print abs(-1295476);

The core numerical ability of Perl is supported through the standard operators that you should be familiar with For example, all of the following expressions return the sort of values you would expect:

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