/*
 * libetp implementation
 *
 * Copyright (c) 2007,2008,2009,2010,2011,2012,2013,2014,2015 Marc Alexander Lehmann <libetp@schmorp.de>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modifica-
 * tion, are permitted provided that the following conditions are met:
 *
 *   1.  Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *
 *   2.  Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License ("GPL") version 2 or any later version,
 * in which case the provisions of the GPL are applicable instead of
 * the above. If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the BSD license, indicate your decision
 * by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL. If you do not delete the
 * provisions above, a recipient may use your version of this file under
 * either the BSD or the GPL.
 */

#ifndef ETP_H_
#define ETP_H_

#include <sys/types.h>

#ifdef __cplusplus
extern "C" {
#endif

#ifndef ETP_REQ_MBMERS
#define ETP_REQ_MBMERS
#endif

#ifndef ETP_API_DECL
#define ETP_API_DECL
#endif

#ifndef ETP_REQ
#define ETP_REQ struct etp_req
#endif

/* request priorities */
enum {
  ETP_PRI_MIN     = -4,
  ETP_PRI_MAX     =  4,
  ETP_PRI_DEFAULT =  0
};

/* request types - custom types have to start at ETP_TYPE_START */
enum {
  ETP_TYPE_QUIT   = 0,
  ETP_TYPE_GROUP  = 1,
  ETP_TYPE_START  = 2
};

struct etp_req
{
  ETP_REQ volatile *next; /* private */

  ETP_REQ_MEMBERS

  unsigned char flags; /* reserved */

  signed char type;/* ETP_xxx constant */
  signed char pri;     /* the priority */
#if __i386 || __amd64
  unsigned char cancelled; /* ETP */
#else
  sig_atomic_t  cancelled; /* ETP */
#endif

  int size; /* private */
  ETP_REQ *grp, *grp_prev, *grp_next, *grp_first; /* private */
};

/* true if the request was cancelled, useful in the invoke callback */
#define ETP_CANCELLED(req)   ((req)->cancelled)

typedef struct etp_pool *etp_pool;

ETP_API_DECL unsigned int etp_nreqs (etp_pool pool);
ETP_API_DECL unsigned int etp_nready (etp_pool pool);
ETP_API_DECL unsigned int etp_npending (etp_pool pool);
ETP_API_DECL unsigned int etp_nthreads (etp_pool pool);
ETP_API_DECL int etp_init (etp_pool pool, void *userdata, void (*want_poll)(void *userdata), void (*done_poll)(void *userdata));
ETP_API_DECL int etp_poll (etp_pool pool);
ETP_API_DECL void etp_grp_cancel (etp_pool pool, ETP_REQ *grp);
ETP_API_DECL void etp_cancel (etp_pool pool, ETP_REQ *req);
ETP_API_DECL void etp_grp_cancel (etp_pool pool, ETP_REQ *grp);
ETP_API_DECL void etp_submit (etp_pool pool, ETP_REQ *req);
ETP_API_DECL void ecb_cold etp_set_max_poll_time (etp_pool pool, double seconds);
ETP_API_DECL void ecb_cold etp_set_max_poll_reqs (etp_pool pool, unsigned int maxreqs);
ETP_API_DECL void ecb_cold etp_set_max_idle (etp_pool pool, unsigned int threads);
ETP_API_DECL void ecb_cold etp_set_idle_timeout (etp_pool pool, unsigned int seconds);
ETP_API_DECL void ecb_cold etp_set_min_parallel (etp_pool pool, unsigned int threads);
ETP_API_DECL void ecb_cold etp_set_max_parallel (etp_pool pool, unsigned int threads);

#ifdef __cplusplus
}
#endif

#endif