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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Handle_Set.h
//
// = AUTHOR
// Doug Schmidt
//
// ============================================================================
#if !defined (ACE_HANDLE_SET_H)
#define ACE_HANDLE_SET_H
#include "ace/ACE.h"
class ACE_Export ACE_Handle_Set
{
// = TITLE
// C++ wrapper for the socket <FD_SET> abstraction.
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);
// = Methods for manipulating bitsets.
void reset (void);
// Initialize the bitmask to all 0s and reset the associated fields.
int is_set (ACE_HANDLE) const;
// Checks whether handle is enabled.
void set_bit (ACE_HANDLE);
// Enables the handle.
void clr_bit (ACE_HANDLE);
// Disables the handle.
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);
// Synchronize the underlying FD_SET with the MAX_FD and the SIZE.
operator fd_set *();
// Returns a pointer to the underlying <fd_set>. Returns 0 if
// <size_> == 0.
#if defined (ACE_HAS_BIG_FD_SET)
void 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 bitpos in bit counting of right to left.
#endif /* ACE_HAS_BIG_FD_SET */
void set_max (ACE_HANDLE max);
// Resets the MAX_FD after a clear of the original MAX_FD.
static const char nbits_[NBITS];
// Table that maps bytes to counts of the enabled bits.
};
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 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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