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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"
// This wrapper design is not very portable to DEC OSF/1 I had to
// redefine NFDBITS to 32. On OSF/1 NFDBITS is a macro that expands to
// (sizeof(fd_mask)*8) which is 4096 by default. This was an
// inappropriate value for defining the MSB_MASK default value. Any
// ideas? The workaround is a pretty severe restriction for OSF/1.
// DJT
// #if defined (__osf__)
// #define NFDBITS 32
// #endif
class ACE_Export ACE_Handle_Set
{
// = TITLE
// C++ wrapper for the socket <FD_SET> abstraction.
friend class ACE_Handle_Set_Iterator;
public:
// = Initialization and termination.
enum
{
MAXSIZE = ACE_DEFAULT_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.
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.
ACE_HANDLE max_handle_;
// Current max handle.
fd_set mask_;
// Bitmask.
enum
{
WORDSIZE = NFDBITS,
#if !defined(ACE_WIN32)
NUM_WORDS = howmany (MAXSIZE, NFDBITS),
#endif
NBITS = 256
};
int count_bits (unsigned long n) const;
// Counts the number of bits enabled in N. Uses a table lookup to
// speed up the count.
void set_max (ACE_HANDLE max);
// Resets the MAX_FD after a clear of the original MAX_FD.
static const char nbits_[ACE_Handle_Set::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 &);
// Constructor.
ACE_HANDLE operator ()(void);
// "Next" operator.
void operator++ (void);
// Advance by "one."
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.
int num_;
// Number of the word we're iterating on.
size_t index_;
// Index of the current <num_> word.
#if !defined (ACE_WIN32)
fd_mask val_;
#endif /* ACE_WIN32 */
// Value of the bits in the word we're iterating on.
};
#if defined (__ACE_INLINE__)
#include "ace/Handle_Set.i"
#endif /* __ACE_INLINE__ */
#endif /* ACE_HANDLE_SET */
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