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-\section{\module{resource} ---
-         Resource usage information}
-
-\declaremodule{builtin}{resource}
-  \platform{Unix}
-\modulesynopsis{An interface to provide resource usage information on
-  the current process.}
-\moduleauthor{Jeremy Hylton}{jeremy@alum.mit.edu}
-\sectionauthor{Jeremy Hylton}{jeremy@alum.mit.edu}
-
-
-This module provides basic mechanisms for measuring and controlling
-system resources utilized by a program.
-
-Symbolic constants are used to specify particular system resources and
-to request usage information about either the current process or its
-children.
-
-A single exception is defined for errors:
-
-
-\begin{excdesc}{error}
-  The functions described below may raise this error if the underlying
-  system call failures unexpectedly.
-\end{excdesc}
-
-\subsection{Resource Limits}
-
-Resources usage can be limited using the \function{setrlimit()} function
-described below. Each resource is controlled by a pair of limits: a
-soft limit and a hard limit. The soft limit is the current limit, and
-may be lowered or raised by a process over time. The soft limit can
-never exceed the hard limit. The hard limit can be lowered to any
-value greater than the soft limit, but not raised. (Only processes with
-the effective UID of the super-user can raise a hard limit.)
-
-The specific resources that can be limited are system dependent. They
-are described in the \manpage{getrlimit}{2} man page.  The resources
-listed below are supported when the underlying operating system
-supports them; resources which cannot be checked or controlled by the
-operating system are not defined in this module for those platforms.
-
-\begin{funcdesc}{getrlimit}{resource}
-  Returns a tuple \code{(\var{soft}, \var{hard})} with the current
-  soft and hard limits of \var{resource}. Raises \exception{ValueError} if
-  an invalid resource is specified, or \exception{error} if the
-  underlying system call fails unexpectedly.
-\end{funcdesc}
-
-\begin{funcdesc}{setrlimit}{resource, limits}
-  Sets new limits of consumption of \var{resource}. The \var{limits}
-  argument must be a tuple \code{(\var{soft}, \var{hard})} of two
-  integers describing the new limits. A value of \code{-1} can be used to
-  specify the maximum possible upper limit.
-
-  Raises \exception{ValueError} if an invalid resource is specified,
-  if the new soft limit exceeds the hard limit, or if a process tries
-  to raise its hard limit (unless the process has an effective UID of
-  super-user).  Can also raise \exception{error} if the underlying
-  system call fails.
-\end{funcdesc}
-
-These symbols define resources whose consumption can be controlled
-using the \function{setrlimit()} and \function{getrlimit()} functions
-described below. The values of these symbols are exactly the constants
-used by \C{} programs.
-
-The \UNIX{} man page for \manpage{getrlimit}{2} lists the available
-resources.  Note that not all systems use the same symbol or same
-value to denote the same resource.  This module does not attempt to
-mask platform differences --- symbols not defined for a platform will
-not be available from this module on that platform.
-
-\begin{datadesc}{RLIMIT_CORE}
-  The maximum size (in bytes) of a core file that the current process
-  can create.  This may result in the creation of a partial core file
-  if a larger core would be required to contain the entire process
-  image.
-\end{datadesc}
-
-\begin{datadesc}{RLIMIT_CPU}
-  The maximum amount of processor time (in seconds) that a process can
-  use. If this limit is exceeded, a \constant{SIGXCPU} signal is sent to
-  the process. (See the \refmodule{signal} module documentation for
-  information about how to catch this signal and do something useful,
-  e.g. flush open files to disk.)
-\end{datadesc}
-
-\begin{datadesc}{RLIMIT_FSIZE}
-  The maximum size of a file which the process may create.  This only
-  affects the stack of the main thread in a multi-threaded process.
-\end{datadesc}
-
-\begin{datadesc}{RLIMIT_DATA}
-  The maximum size (in bytes) of the process's heap.
-\end{datadesc}
-
-\begin{datadesc}{RLIMIT_STACK}
-  The maximum size (in bytes) of the call stack for the current
-  process.
-\end{datadesc}
-
-\begin{datadesc}{RLIMIT_RSS}
-  The maximum resident set size that should be made available to the
-  process.
-\end{datadesc}
-
-\begin{datadesc}{RLIMIT_NPROC}
-  The maximum number of processes the current process may create.
-\end{datadesc}
-
-\begin{datadesc}{RLIMIT_NOFILE}
-  The maximum number of open file descriptors for the current
-  process.
-\end{datadesc}
-
-\begin{datadesc}{RLIMIT_OFILE}
-  The BSD name for \constant{RLIMIT_NOFILE}.
-\end{datadesc}
-
-\begin{datadesc}{RLIMIT_MEMLOCK}
-  The maximum address space which may be locked in memory.
-\end{datadesc}
-
-\begin{datadesc}{RLIMIT_VMEM}
-  The largest area of mapped memory which the process may occupy.
-\end{datadesc}
-
-\begin{datadesc}{RLIMIT_AS}
-  The maximum area (in bytes) of address space which may be taken by
-  the process.
-\end{datadesc}
-
-\subsection{Resource Usage}
-
-These functions are used to retrieve resource usage information:
-
-\begin{funcdesc}{getrusage}{who}
-  This function returns an object that describes the resources
-  consumed by either the current process or its children, as specified
-  by the \var{who} parameter.  The \var{who} parameter should be
-  specified using one of the \constant{RUSAGE_*} constants described
-  below.
-
-  The fields of the return value each describe how a particular system
-  resource has been used, e.g. amount of time spent running is user mode
-  or number of times the process was swapped out of main memory. Some
-  values are dependent on the clock tick internal, e.g. the amount of
-  memory the process is using.
-
-  For backward compatibility, the return value is also accessible as
-  a tuple of 16 elements.
-
-  The fields \member{ru_utime} and \member{ru_stime} of the return value
-  are floating point values representing the amount of time spent
-  executing in user mode and the amount of time spent executing in system
-  mode, respectively. The remaining values are integers. Consult the
-  \manpage{getrusage}{2} man page for detailed information about these
-  values. A brief summary is presented here:
-
-\begin{tableiii}{r|l|l}{code}{Index}{Field}{Resource}
-  \lineiii{0}{\member{ru_utime}}{time in user mode (float)}
-  \lineiii{1}{\member{ru_stime}}{time in system mode (float)}
-  \lineiii{2}{\member{ru_maxrss}}{maximum resident set size}
-  \lineiii{3}{\member{ru_ixrss}}{shared memory size}
-  \lineiii{4}{\member{ru_idrss}}{unshared memory size}
-  \lineiii{5}{\member{ru_isrss}}{unshared stack size}
-  \lineiii{6}{\member{ru_minflt}}{page faults not requiring I/O}
-  \lineiii{7}{\member{ru_majflt}}{page faults requiring I/O}
-  \lineiii{8}{\member{ru_nswap}}{number of swap outs}
-  \lineiii{9}{\member{ru_inblock}}{block input operations}
-  \lineiii{10}{\member{ru_oublock}}{block output operations}
-  \lineiii{11}{\member{ru_msgsnd}}{messages sent}
-  \lineiii{12}{\member{ru_msgrcv}}{messages received}
-  \lineiii{13}{\member{ru_nsignals}}{signals received}
-  \lineiii{14}{\member{ru_nvcsw}}{voluntary context switches}
-  \lineiii{15}{\member{ru_nivcsw}}{involuntary context switches}
-\end{tableiii}
-
-  This function will raise a \exception{ValueError} if an invalid
-  \var{who} parameter is specified. It may also raise
-  \exception{error} exception in unusual circumstances.
-
-  \versionchanged[Added access to values as attributes of the
-  returned object]{2.3}
-\end{funcdesc}
-
-\begin{funcdesc}{getpagesize}{}
-  Returns the number of bytes in a system page. (This need not be the
-  same as the hardware page size.) This function is useful for
-  determining the number of bytes of memory a process is using. The
-  third element of the tuple returned by \function{getrusage()} describes
-  memory usage in pages; multiplying by page size produces number of
-  bytes. 
-\end{funcdesc}
-
-The following \constant{RUSAGE_*} symbols are passed to the
-\function{getrusage()} function to specify which processes information
-should be provided for.
-
-\begin{datadesc}{RUSAGE_SELF}
-  \constant{RUSAGE_SELF} should be used to
-  request information pertaining only to the process itself.
-\end{datadesc}
-
-\begin{datadesc}{RUSAGE_CHILDREN}
-  Pass to \function{getrusage()} to request resource information for
-  child processes of the calling process.
-\end{datadesc}
-
-\begin{datadesc}{RUSAGE_BOTH}
-  Pass to \function{getrusage()} to request resources consumed by both
-  the current process and child processes.  May not be available on all
-  systems.
-\end{datadesc}