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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Handle_Set.h
//
// = AUTHOR
// Douglas C. Schmidt <schmidt@cs.wustl.edu>
//
// ============================================================================
#ifndef ACE_HANDLE_SET_H
#define ACE_HANDLE_SET_H
#include "ace/ACE.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
class ACE_Export ACE_Handle_Set
{
// = TITLE
// C++ wrapper facade for the socket <fd_set> abstraction.
//
// = DESCRIPTION
// This abstraction is a very efficient wrapper facade over
// <fd_set>. In particular, no range checking is performed, so
// it's important not to set or clear bits that are outside the
// <ACE_DEFAULT_SELECT_REACTOR_SIZE>.
public:
friend class ACE_Handle_Set_Iterator;
// = Initialization and termination.
enum
{
MAXSIZE = ACE_DEFAULT_SELECT_REACTOR_SIZE
};
// = Initialization methods.
ACE_Handle_Set (void);
// Constructor, initializes the bitmask to all 0s.
ACE_Handle_Set (const ACE_FD_SET_TYPE &mask);
// Constructor, initializes the handle set from a given mask.
// <ACE_FD_SET_TYPE> is a <typedef> based on the platform's native
// type used for masks passed to <select>.
#if defined (ACE_HAS_WINCE)
~ACE_Handle_Set (void);
// Default dtor.
#endif /* ACE_HAS_WINCE */
// = Methods for manipulating bitsets.
void reset (void);
// Initialize the bitmask to all 0s and reset the associated fields.
int is_set (ACE_HANDLE handle) const;
// Checks whether <handle> is enabled. No range checking is
// performed so <handle> must be less than
// <ACE_DEFAULT_SELECT_REACTOR_SIZE>.
void set_bit (ACE_HANDLE handle);
// Enables the <handle>. No range checking is performed so <handle>
// must be less than <ACE_DEFAULT_SELECT_REACTOR_SIZE>.
void clr_bit (ACE_HANDLE handle);
// Disables the <handle>. No range checking is performed so
// <handle> must be less than <ACE_DEFAULT_SELECT_REACTOR_SIZE>.
int num_set (void) const;
// Returns a count of the number of enabled bits.
ACE_HANDLE max_set (void) const;
// Returns the number of the large bit.
void sync (ACE_HANDLE max);
// Rescan the underlying <fd_set> up to handle <max> to find the new
// <max_handle> (highest bit set) and <size> (how many bits set) values.
// This is useful for evaluating the changes after the handle set has
// been manipulated in some way other than member functions; for example,
// after <select> modifies the <fd_set>.
operator fd_set *();
// Returns a pointer to the underlying <fd_set>. Returns 0 if
// there are no handle bits set (<size_> == 0).
fd_set *fdset (void);
// Returns a pointer to the underlying <fd_set>. Returns 0 if
// there are no handle bits set (<size_> == 0).
#if defined (ACE_HAS_BIG_FD_SET)
ACE_Handle_Set & operator= (const ACE_Handle_Set &);
// Assignment operator optimizes for cases where <size_> == 0.
#endif /* ACE_HAS_BIG_FD_SET */
void dump (void) const;
// Dump the state of an object.
ACE_ALLOC_HOOK_DECLARE;
// Declare the dynamic allocation hooks.
private:
int size_;
// Size of the set, i.e., a count of the number of enabled bits.
ACE_HANDLE max_handle_;
// Current max handle.
#if defined (ACE_HAS_BIG_FD_SET)
ACE_HANDLE min_handle_;
// Current min handle.
#endif /* ACE_HAS_BIG_FD_SET */
fd_set mask_;
// Bitmask.
enum
{
WORDSIZE = NFDBITS,
#if !defined (ACE_WIN32)
NUM_WORDS = howmany (MAXSIZE, NFDBITS),
#endif /* ACE_WIN32 */
NBITS = 256
};
static int count_bits (u_long n);
// Counts the number of bits enabled in N. Uses a table lookup to
// speed up the count.
#if defined (ACE_HAS_BIG_FD_SET)
static int bitpos (u_long bit);
// Find the position of the bit counting from right to left.
#endif /* ACE_HAS_BIG_FD_SET */
void set_max (ACE_HANDLE max);
// Resets the <max_handle_> after a clear of the original
// <max_handle_>.
static const char nbits_[NBITS];
// Table that maps bytes to counts of the enabled bits in each value
// from 0 to 255.
};
class ACE_Export ACE_Handle_Set_Iterator
{
// = TITLE
// Iterator for the <ACE_Handle_Set> abstraction.
public:
ACE_Handle_Set_Iterator (const ACE_Handle_Set &hs);
// Constructor.
~ACE_Handle_Set_Iterator (void);
// Default dtor.
ACE_HANDLE operator () (void);
// "Next" operator. Returns the next unseen <ACE_HANDLE> in the
// <Handle_Set> up to <handle_set_.max_handle_>). When all the
// handles have been seen returns <ACE_INVALID_HANDLE>. Advances
// the iterator automatically, so you need not call <operator++>
// (which is now obsolete).
void operator++ (void);
// This is a no-op and no longer does anything. It's only here for
// backwards compatibility.
void dump (void) const;
// Dump the state of an object.
ACE_ALLOC_HOOK_DECLARE;
// Declare the dynamic allocation hooks.
private:
const ACE_Handle_Set &handles_;
// The <Handle_Set> we are iterating through.
#if defined (ACE_WIN32)
u_int handle_index_;
#elif !defined (ACE_HAS_BIG_FD_SET)
int handle_index_;
#elif defined (ACE_HAS_BIG_FD_SET)
int handle_index_;
u_long oldlsb_;
#endif /* ACE_WIN32 */
// Index of the bit we're examining in the current <word_num_> word.
int word_num_;
// Number of the word we're iterating over (typically between 0..7).
#if defined (ACE_HAS_BIG_FD_SET)
int word_max_;
// Number max of the words with a possible bit on.
#endif /* ACE_HAS_BIG_FD_SET */
#if !defined (ACE_WIN32) && !defined (ACE_HAS_BIG_FD_SET)
fd_mask word_val_;
// Value of the bits in the word we're iterating on.
#elif !defined (ACE_WIN32) && defined (ACE_HAS_BIG_FD_SET)
u_long word_val_;
// Value of the bits in the word we're iterating on.
#endif /* !ACE_WIN32 && !ACE_HAS_BIG_FD_SET */
};
#if defined (__ACE_INLINE__)
#include "ace/Handle_Set.i"
#endif /* __ACE_INLINE__ */
#endif /* ACE_HANDLE_SET */
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