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/* select.h
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#ifndef _SELECT_H_
#define _SELECT_H_
struct fh_select_data_serial
{
DWORD event;
OVERLAPPED ov;
fh_select_data_serial () : event (0) { memset (&ov, 0, sizeof ov); }
};
struct select_record
{
int fd;
HANDLE h;
fhandler_base *fh;
_cygtls *tls;
int thread_errno;
bool windows_handle;
bool read_ready, write_ready, except_ready;
bool read_selected, write_selected, except_selected;
bool except_on_write;
int (*startup) (select_record *, class select_stuff *);
int (*peek) (select_record *, bool);
int (*verify) (select_record *, fd_set *, fd_set *, fd_set *);
void (*cleanup) (select_record *, class select_stuff *);
struct select_record *next;
/* If an fhandler type needs per-fhandler, per-select data, this union
is the place to add it. First candidate: fhandler_serial. */
union
{
fh_select_data_serial *fh_data_serial;
void *fh_data_union; /* type-agnostic placeholder for constructor */
};
void set_select_errno () {__seterrno (); thread_errno = errno;}
int saw_error () {return thread_errno;}
select_record (int): next (NULL) {}
select_record () :
fd (0), h (NULL), fh (NULL), tls (&_my_tls), thread_errno (0),
windows_handle (false), read_ready (false), write_ready (false),
except_ready (false), read_selected (false), write_selected (false),
except_selected (false), except_on_write (false),
startup (NULL), peek (NULL), verify (NULL), cleanup (NULL),
next (NULL), fh_data_union (NULL) {}
#ifdef DEBUGGING
void dump_select_record ();
#endif
};
struct select_info
{
cygthread *thread;
bool stop_thread;
HANDLE bye;
select_record *start;
select_info (): thread (NULL), stop_thread (0), start (NULL) {}
};
struct select_pipe_info: public select_info
{
select_pipe_info (): select_info () {}
};
struct select_fifo_info: public select_info
{
select_fifo_info (): select_info () {}
};
struct select_socket_info: public select_info
{
int num_w4;
LONG *ser_num;
HANDLE *w4;
select_socket_info (): select_info (), num_w4 (0), ser_num (0), w4 (NULL) {}
};
class select_stuff
{
public:
enum wait_states
{
select_signalled = -3,
select_error = -1,
select_ok = 0,
select_set_zero = 1
};
~select_stuff ();
bool return_on_signal;
bool always_ready, windows_used;
select_record start;
/* If an fhandler type needs a singleton per-select datastructure for all
its objects in the descriptor lists, here's the place to be. This is
mainly used to maintain a single thread for all fhandlers of a single
type in the descriptor lists. */
select_pipe_info *device_specific_pipe;
select_pipe_info *device_specific_ptys;
select_fifo_info *device_specific_fifo;
select_socket_info *device_specific_socket;
bool test_and_set (int, fd_set *, fd_set *, fd_set *);
int poll (fd_set *, fd_set *, fd_set *);
wait_states wait (fd_set *, fd_set *, fd_set *, LONGLONG);
void cleanup ();
void destroy ();
select_stuff (): return_on_signal (false), always_ready (false),
windows_used (false), start (),
device_specific_pipe (NULL),
device_specific_ptys (NULL),
device_specific_fifo (NULL),
device_specific_socket (NULL)
{}
};
extern "C" int cygwin_select (int , fd_set *, fd_set *, fd_set *,
struct timeval *to);
#endif /* _SELECT_H_ */
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