#ifndef IOLOOP_PRIVATE_H
#define IOLOOP_PRIVATE_H

#include "priorityq.h"
#include "ioloop.h"
#include "array-decl.h"

#ifndef IOLOOP_INITIAL_FD_COUNT
#  define IOLOOP_INITIAL_FD_COUNT 128
#endif

struct ioloop {
        struct ioloop *prev;

	struct ioloop_context *cur_ctx;

	struct io_file *io_files;
	struct io_file *next_io_file;
	struct priorityq *timeouts;
	ARRAY(struct timeout *) timeouts_new;
	struct io_wait_timer *wait_timers;

        struct ioloop_handler_context *handler_context;
        struct ioloop_notify_handler_context *notify_handler_context;
	unsigned int max_fd_count;

	io_loop_time_moved_callback_t *time_moved_callback;
	time_t next_max_time;
	uint64_t ioloop_wait_usecs;
	struct timeval wait_started;

	unsigned int io_pending_count;

	unsigned int running:1;
	unsigned int iolooping:1;
};

struct io {
	enum io_condition condition;
	const char *source_filename;
	unsigned int source_linenum;
	/* trigger I/O callback even if OS doesn't think there is input
	   pending */
	bool pending;

	io_callback_t *callback;
        void *context;

	struct ioloop *ioloop;
	struct ioloop_context *ctx;
};

struct io_file {
	struct io io;

	/* use a doubly linked list so that io_remove() is quick */
	struct io_file *prev, *next;

	int refcount;
	int fd;

	/* only for io_add_istream(), a bit kludgy to be here.. */
	struct istream *istream;
};

struct timeout {
	struct priorityq_item item;
	const char *source_filename;
	unsigned int source_linenum;

        unsigned int msecs;
	struct timeval next_run;

	timeout_callback_t *callback;
        void *context;

	struct ioloop *ioloop;
	struct ioloop_context *ctx;

	unsigned int one_shot:1;
};

struct io_wait_timer {
	struct io_wait_timer *prev, *next;
	const char *source_filename;
	unsigned int source_linenum;

	struct ioloop *ioloop;
	uint64_t usecs;
};

struct ioloop_context_callback {
	io_callback_t *activate;
	io_callback_t *deactivate;
	void *context;
	bool activated;
};

struct ioloop_context {
	int refcount;
	struct ioloop *ioloop;
	ARRAY(struct ioloop_context_callback) callbacks;
};

int io_loop_get_wait_time(struct ioloop *ioloop, struct timeval *tv_r);
void io_loop_handle_timeouts(struct ioloop *ioloop);
void io_loop_call_io(struct io *io);

void io_loop_handler_run_internal(struct ioloop *ioloop);

/* I/O handler calls */
void io_loop_handle_add(struct io_file *io);
void io_loop_handle_remove(struct io_file *io, bool closed);

void io_loop_handler_init(struct ioloop *ioloop, unsigned int initial_fd_count);
void io_loop_handler_deinit(struct ioloop *ioloop);

void io_loop_notify_remove(struct io *io);
void io_loop_notify_handler_deinit(struct ioloop *ioloop);

void io_loop_context_activate(struct ioloop_context *ctx);
void io_loop_context_deactivate(struct ioloop_context *ctx);

#endif
