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