dexp
Math.ldexp( aFloat, anInteger ) -> aFloat
Returns the value of aFloat *2 anInteger .

log
Math.log( aNumeric ) -> aFloat
Returns the natural logarithm of aNumeric.

log10
Math.log10( aNumeric ) -> aFloat
Returns the base 10 logarithm of aNumeric.
sin
Math.sin( aNumeric ) -> aFloat
Computes the sine of aNumeric (expressed in radians). Returns -1..1.

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sqrt
Math.sqrt( aNumeric ) -> aFloat
Returns the non-negative square root of aNumeric. Raises ArgError if aNumeric is less than zero.

tan
Math.tan( aNumeric ) -> aFloat
Returns the tangent of aNumeric (expressed in radians).

_id2ref
ObjectSpace._id2ref( anId ) -> anObject


Converts an object id to a reference to the object. May not be called on an object id passed as a parameter to a finalizer.

s = "I am a string" » "I am a string"
r = ObjectSpace._id2ref(s.id) »"I am a string"
r == s »true

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define_finalizer
ObjectSpace.define_finalizer( anObject, aProc=proc() )
Adds aProc as a finalizer, to be called when anObject is about to be destroyed.

each_object
ObjectSpace.each_object( [ aClassOrMod ] ) {| anObj | block } -> aFixnum


Calls the block once for each living, nonimmediate object in this Ruby process. If aClassOrMod is specified, calls the block for only those classes or modules that match (or are a subclass of) aClassOrMod. Returns the number of objects found.

a = 102.7
b = 95
ObjectSpace.each_object(Numeric) {|x| p x }
print "Total count: ", ObjectSpace.each_object {} ,"\n"

produces:

102.7
2.718281828
3.141592654
Total count: 372

garbage_collect ObjectSpace.garbage_collect -> nil

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undefine_finalizer
ObjectSpace.undefine_finalizer( anObject )
Removes all finalizers for anObject.


egid
Process.egid -> aFixnum
Returns the effective group id for this process.
Process.egid » 500


egid=
Process.egid= aFixnum -> aFixnum
Sets the effective group id for this process.

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euid
Process.euid -> aFixnum
Returns the effective user id for this process.
process.euid » 501

euid=
Process.euid= aFixnum
Sets the effective user id for this process. Not available on all platforms.

exit!
Process.exit!( aFixnum=-1 )
Exits the process immediately. No exit handlers are run. aFixnum is returned to the underlying system as the exit status.

Process.exit!(0)

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getpgid
Process.getpgid( anInteger ) -> anInteger
Returns the process group id for the given process id. Not available on all platforms.
Process.getpgid(Process.ppid()) » 32438

getpgrp
Process.getpgrp -> anInteger
Returns the process group id for this process. Not available on all platforms.
Process.getpgid(0) » 32438
Process.getpgrp » 32438

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getpriority
process.getpriority( aKind, anInteger ) -> aFixnum
Gets the scheduling priority for specified process, process group, or user. aKind indicates the kind of entity to find: one of Process::PRIO_PGRP , Process::PRIO_USER , or Process::PRIO_PROCESS . anInteger is an id indicating the particular process, process group, or user (an id of 0 means current). Lower priorities are more favorable for scheduling. Not available on all platforms.

Process.getpriority(Process::PRIO_USER, 0) » 0
Process.getpriority(Process::PRIO_PROCESS, 0) » 0

gid
process.gid -> aFixnum
Returns the group id for this process.
Process.gid » 500

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gid
Process.gid -> aFixnum
Returns the group id for this process.
Process.gid » 500

gid=
Process.gid= aFixnum -> aFixnum
Sets the group id for this process.

kill
Process.kill( aSignal, [ aPid ]+ ) -> aFixnum


Sends the given signal to the specified process id(s), or to the current process if aPid is zero. aSignal may be an integer signal number or a POSIX signal name (either with or without a SIG prefix). If aSignal is negative (or starts with a ``-'' sign), kills process groups instead of processes. Not all signals are available on all platforms.

trap("SIGHUP") { close_then_exit }
Process.kill("SIGHUP", 0)

pid
Process.pid -> aFixnum
Returns the process id of this process. Not available on all platforms.
Process.pid » 1488

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ppid
Process.ppid -> aFixnum

Returns the process id of the parent of this process. Always returns 0 on NT. Not available on all platforms.

print "I am ", Process.pid, "\n"
Process.fork { print "Dad is ", Process.ppid, "\n" }

produces:

I am 1490
Dad is 1490

setpgid
Process.setpgid( aPid, anInteger ) -> 0
Sets the process group id of aPid (0 indicates this process) to anInteger. Not available on all platforms.

setpgrp
Process.setpgrp -> 0
Equivalent to setpgid(0,0). Not available on all platforms.

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setsid
Process.setsid -> aFixnum
Establishes this process as a new session and process group leader, with no controlling tty. Returns the session id. Not available on all platforms.
Process.setsid » 1495

uid
Process.uid -> aFixnum
Returns the user id of this process.
Process.uid » 501

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uid=
Process.uid= anInteger -> aNumeric
Sets the (integer) user id for this process. Not available on all platforms.

wait
Process.wait -> aFixnum

Waits for any child process to exit and returns the process id of that child. Raises a SystemError if there are no child processes. Not available on all platforms.

Process.fork { exit 1; } » 1500
Process.wait » 1500

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wait2
Process.wait2 -> anArray
Waits for any child process to exit and returns an array containing the process id and the exit status of that child. Raises a SystemError if there are no child processes.
Process.fork { exit 1 } » 1503
Process.wait2 » [1503, 256]

waitpid
Process.waitpid( aPid, anInteger=0 ) -> aPid
Waits for the given child process to exit. anInteger may be a logical or of the flag value Process::WNOHANG (do not block if no child available) or Process::WUNTRACED (return stopped children that haven't been reported). Not all flags are available on all platforms, but a flag value of zero will work on all platforms.

include Process
pid = fork { sleep 3 } » 1506
Time.now » Sun Jun 09 00:20:09 CDT 2002
waitpid(pid, Process::WNOHANG) » nil
Time.now » Sun Jun 09 00:20:09 CDT 2002
waitpid(pid, 0) » 1506
Time.now » Sun Jun 09 00:20:12 CDT 2002

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waitpid2
Process.waitpid2( aPid, anInteger=0 ) -> anArray


Waits for the given child process to exit, returning that child's process id and exit status. anInteger may be a logical or of the flag value Process::WNOHANG (do not block if no child available) or Process::WUNTRACED (return stopped children that haven't been reported). Not all flags are available on all platforms, but a flag value of zero will work on all platforms.

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