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returns the values contained in the semaphore set as a list
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id APPENDIXES
returns the system identifier for the semaphore set
op OPLIST
performs a specific operation on the semaphore set OPLIST is a multiple of a three-value list that defines the operation to perform The first argument is the semaphore number, the second is the operator, and the last is the FLAGS value
Perl: The Complete Reference
remove
removes (destroys) the semaphore set
set STAT set(NAME => VALUE [, NAME => VALUE])
sets the uid, gid, and mode of the semaphore set Accepts either an IPC::Semaphore::stat object, as returned by the stat method (see the example that follows), or a hash
setall LIST
sets all the values in the set to those given in LIST The LIST must be of the correct length
setval N, VALUE
sets the value of the semaphore at index N to VALUE
stat
returns an IP::Semaphore::stat object that is a subclass of the Class::Struct class The object consists of the following fields: uid gid
cuid
AM FL Y
cgid mode
ctime
otime
nsems
References
14; see also Class::Struct, IPC::SysV
IPC::SysV
This module supplies the System V IPC constants used by the built-in IPC calls
use SysV::IPC;
Note that the module does not import any symbols implicitly You need to specify the symbols you want to use The list of available symbols is shown here:
Appendix B:
Standard Perl Library
GETALL GETZCNT IPC_ALLOC IPC_LOCKED IPC_PRIVATE IPC_SETACL IPC_WANTED MSG_FWAIT MSG_QWAIT MSG_R MSG_WWAIT SEM_A SEM_ORDER SETALL SHMLBA SHM_A SHM_DEST SHM_INIT SHM_NOSWAP SHM_RND SHM_UNLOCK S_IRUSR S_IRGRP S_IROTH
GETNCNT IPC_CREAT IPC_M IPC_R IPC_SETLABEL MSG_LOCKED MSG_RWAIT SEM_ALLOC SEM_R SETVAL SHM_CLEAR SHM_ECACHE SHM_LOCK SHM_R SHM_SHARE_MMU SHM_W S_IWUSR S_IWGRP S_IWOTH
GETPID IPC_EXCL IPC_NOERROR IPC_RMID IPC_STAT MSG_MWAIT MSG_STAT SEM_DEST SEM_UNDO
GETVAL IPC_GETACL IPC_NOWAIT IPC_SET IPC_W MSG_NOERROR MSG_W SEM_ERR
SHM_COPY SHM_FMAP SHM_LOCKED SHM_RDONLY SHM_SHATTR S_IRWXU S_IRWXG S_IRWXO
SHM_DCACHE SHM_ICACHE SHM_MAP SHM_REMOVED SHM_SIZE
You can also optionally import the ftok function:
ftok(PATH, ID)
APPENDIXES
This creates a unique key suitable for use with the msgget, semget, and shmget functions
References
See IPC::Msg, IPC::Semaphore
Perl: The Complete Reference
Math::BigFloat
This module supports the use of floating point numbers of arbitrary length
use Math::BigFloat; $bigfloat = Math::BigFloat->new($string);
The new method creates a new floating point object based on the supplied string Most operators are overloaded to support the new floating point objects, providing you create the number with
$bigfloat = new Math::BigFloat '123456789012345678901234567890';
In addition, you can use the following methods
fadd(STRING)
adds the number STRING to the object, returning a number string
fsub(STRING)
subtracts the number STRING from the object, returning a number string
fmul(STRING)
multiplies the object by the number STRING, returning a number string
fdiv(STRING [,SCALE])
divides the object by the number STRING, to the specified SCALE places
fneg()
negates the number
fabs()
returns the absolute number
Appendix B:
Standard Perl Library
fcmp(STRING)
compares the object to the number STRING, returning a value less than, equal to, or greater than zero, according to whether the number is less than, equal to, or greater than the given number
fround(SCALE)
rounds the number object to SCALE digits, returning the number strings
ffround(SCALE)
rounds the number at the SCALEth place within the number
fnorm()
normalizes the floating point, returning a number string
fsqrt([SCALE])
returns the square root of the number object, rounded to the specified SCALE if supplied
Reference
See also Math::BigInt
Math::BigInt
Supports math with integer values of arbitrary sizes
use Math::BigInt; $int = Math::BigInt->new($string);
Basic operators are overloaded, providing you create the new integer with
APPENDIXES $int = new Math::BigInt '1234567890123456789012345678901234567890';
The following methods are supported by the new object
bneg return BINT negation
Perl: The Complete Reference
negates the integer, and returns an integer string
babs
returns the absolute value as an integer string
bcmp(STRING)
compares the object with the supplied integer STRING, returning a value smaller, equal to, or greater than zero, depending on the relationship between the object and the supplied STRING
badd(STRING)
adds STRING to the object
bsub(STRING)
subtracts STRING from the object
bmul(STRING)
multiplies the object by STRING
bdiv(STRING)
divides the object by STRING, returning the quotient and remainder as strings
bmod(STRING)
returns the modulus of the object and STRING
bgcd(STRING)
returns the largest common divisor
bnorm
normalizes the object
Reference
See also Math::BigFloat
Appendix B:
Standard Perl Library
Math::Complex
This module supports the use of complex numbers in mathematical computations
use Math::Complex;
You create a new complex number with the make method,
$z = Math::Complex->make(1,2);
the cplx function,
$z = cplx(1, 2);
or directly, using complex notation:
$z = 3 + 4*i;
In addition, you can specify them in the polar form:
$z = Math::Complex->emake(5, pi/3); $x = cplxe(5, pi/3);
The first argument is the modulus, and the second is the angle in radians The module also overloads the following operations to allow complex math directly within Perl, where z is an imaginary variable
z1 + z2 = (a + c) + i(b + d) z1 - z2 = (a - c) + i(b - d) z1 * z2 = (r1 * r2) * exp(i * (t1 + t2)) z1 / z2 = (r1 / r2) * exp(i * (t1 - t2)) z1 ** z2 = exp(z2 * log z1) ~z = a - bi abs(z) = r1 = sqrt(a*a + b*b) sqrt(z) = sqrt(r1) * exp(i * t/2) exp(z) = exp(a) * exp(i * b) log(z) = log(r1) + i*t sin(z) = 1/2i (exp(i * z1) - exp(-i * z)) cos(z) = 1/2 (exp(i * z1) + exp(-i * z)) atan2(z1, z2) = atan(z1/z2)
APPENDIXES
Perl: The Complete Reference
You can also use the following methods: Im(z) acosh(z) acsch(z) asin(z) cbrt(z) csc(z) sec(z) tanh(z) Re(z) acot(z) arg(z) asinh(z) cosh(z) csch(z) sech(z) abs(z) acoth(z) asec(z) atan(z) cot(z) log10(z) sinh(z) acos(z) acsc(z) asech(z) atanh(z) coth(z) logn(z,n) tan(z)
Math::Trig
This module defines the full set of trigonometric functions
use Math::Trig;
The supplied functions are as follows
returns the tangent
csc, cosec, sec, cot, cotan
The cofunctions of sine, cosine, and tangent The csc and cosec are aliases for each other, as are cot and cotan
asin, acos, atan
The arcus (inverse) of sin, cos, and tan
atan2(y, x)
The principle value of the arctangent of y/x
Appendix B:
Standard Perl Library
acsc, acosec, asec, acot, acotan
The arcus cofunctions
sinh, cosh, tanh
The hyperbolic functions
csch, cosech, sech, coth, cotanh
The cofunctions of the hyperbolics
asinh, acosh, atanh
The arcus of the hyperbolics
acsch, acosech, asech, acoth, acotanh
The arcus cofunctions of the hyperbolics The module also defines the constant pi
Net::Ping
This module supports a simplified interface, to the process of determining a remote host s accessibility
use Net::Ping;
The module uses an object-oriented interface and makes use of the alarm function and associated signal to test for a suitable time-out value To create a new Ping object:
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