/*-
 * Copyright (c) 2002-2018 The UbixOS Project.
 * All rights reserved.
 *
 * This was developed by Christopher W. Olsen for the UbixOS Project.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1) Redistributions of source code must retain the above copyright notice, this list of
 *    conditions, the following disclaimer and the list of authors.
 * 2) Redistributions in binary form must reproduce the above copyright notice, this list of
 *    conditions, the following disclaimer and the list of authors in the documentation and/or
 *    other materials provided with the distribution.
 * 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to
 *    endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 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 OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _UBIXOS_SCHED_H
#define _UBIXOS_SCHED_H

#include <sys/types.h>
#include <vfs/vfs.h>
#include <ubixos/tty.h>

#include <sys/tss.h>
#include <sys/thread.h>
#include <ubixos/wait.h>

#define NO_GROUP -1
#define NR_GROUPS 32

typedef enum {
  PLACEHOLDER = -2, DEAD = -1, NEW = 0, READY = 1, RUNNING = 2, IDLE = 3, FORK = 4, WAIT = 5, UNINTERRUPTIBLE = 6, INTERRUPTIBLE = 7
} tState;

struct osInfo {
    uInt8 timer;
    uInt8 v86Task;
    bool v86If;
    uInt32 vmStart;
    uInt32 stdinSize;
    uInt32 controlKeys;
    char *stdin;
    char cwd[1024]; /* current working dir */
};

typedef struct taskStruct {
    pidType id;
    char name[256];
    struct taskStruct *prev;
    struct taskStruct *next;
    struct tssStruct tss;
    struct i387Struct i387;
    struct osInfo oInfo;
    //fileDescriptor *imageFd;
    fileDescriptor *files[MAX_OFILES];
    tState state;
    uint32_t uid, gid;
    uint16_t euid, suid;
    uint16_t egid, sgid;
    uInt16 usedMath;
    tty_term *term;
    struct thread td;
    struct {
        struct inode *pwd;
        struct inode *root;
        struct inode *exec;
    } inodes;
    uint32_t counter;
    uint16_t groups[NR_GROUPS];
} kTask_t;

int sched_init();
int sched_setStatus(pidType, tState);
int sched_deleteTask(pidType);
int sched_addDelTask(kTask_t *);
kTask_t *sched_getDelTask();
void sched_yield();
void sched();

void schedEndTask(pidType pid);
kTask_t *schedNewTask();
kTask_t *schedFindTask(uInt32 id);

extern kTask_t *_current;
extern kTask_t *_usedMath;

#endif