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//

//

//    Copyright 2010 TheSeven

//

//

//    This file is part of emCORE.

//

//    emCORE is free software: you can redistribute it and/or

//    modify it under the terms of the GNU General Public License as

//    published by the Free Software Foundation, either version 2 of the

//    License, or (at your option) any later version.

//

//    emCORE is distributed in the hope that it will be useful,

//    but WITHOUT ANY WARRANTY; without even the implied warranty of

//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

//    See the GNU General Public License for more details.

//

//    You should have received a copy of the GNU General Public License along

//    with emCORE.  If not, see <http://www.gnu.org/licenses/>.

//

//

#ifndef __THREAD_H__

#define __THREAD_H__

#include "global.h"

#include "contextswitch.h"

#define TIMEOUT_NONE 0

#define TIMEOUT_BLOCK -1

#define THREAD_FOUND 1

#define THREAD_OK 0

#define THREAD_TIMEOUT -1

#define ALREADY_SUSPENDED -4

#define ALREADY_RESUMED -5

enum thread_state

{

    THREAD_FREE = 0,

    THREAD_SUSPENDED = 1,

    THREAD_READY,

    THREAD_RUNNING,

    THREAD_BLOCKED,

    THREAD_DEFUNCT,

    THREAD_DEFUNCT_ACK

};

enum thread_block

{

    THREAD_NOT_BLOCKED = 0,

    THREAD_BLOCK_SLEEP,

    THREAD_BLOCK_MUTEX,

    THREAD_BLOCK_WAKEUP,

    THREAD_DEFUNCT_STKOV,

    THREAD_DEFUNCT_PANIC

};

enum thread_type

{

    USER_THREAD = 0,

    OS_THREAD,

    CORE_THREAD

};

#define SCHEDULER_THREAD_INFO_VERSION 2

struct scheduler_thread

{

    uint32_t regs[16];

    uint32_t cpsr;

    uint32_t state;

    const char* name;

    uint32_t cputime_current;

    uint64_t cputime_total;

    uint32_t startusec;

    struct scheduler_thread* thread_next;

    struct scheduler_thread* queue_next;

    uint32_t timeout;

    uint32_t blocked_since;

    void* blocked_by;

    uint32_t* stack;

    int err_no;

    enum thread_block block_type;

    enum thread_type type;

    uint8_t priority;

    uint8_t cpuload;

};

struct mutex

{

    struct scheduler_thread* owner;

    struct scheduler_thread* waiters;

    int count;

};

struct wakeup

{

    struct scheduler_thread* waiter;

    bool signalled;

};

extern struct scheduler_thread* head_thread IBSS_ATTR;

extern struct scheduler_thread* current_thread IBSS_ATTR;

void scheduler_init() INITCODE_ATTR;

void scheduler_pause_accounting() ICODE_ATTR;

void scheduler_resume_accounting() ICODE_ATTR;

void scheduler_switch(struct scheduler_thread* thread, struct scheduler_thread* block) ICODE_ATTR;

bool scheduler_freeze(bool value);

struct scheduler_thread* thread_create(struct scheduler_thread* thread, const char* name,

                                       const void* code, void* stack, int stacksize,

                                       enum thread_type type, int priority, bool run);

int thread_suspend(struct scheduler_thread* thread);

int thread_resume(struct scheduler_thread* thread);

void thread_set_name(struct scheduler_thread* thread, char* name);

void thread_set_priority(struct scheduler_thread* thread, int priority);

int thread_terminate(struct scheduler_thread* thread);

int thread_killlevel(enum thread_type type, bool killself);

enum thread_state thread_get_state(struct scheduler_thread* thread);

void thread_exit();

void mutex_init(struct mutex* obj) ICODE_ATTR;

int mutex_lock(struct mutex* obj, int timeout) ICODE_ATTR;

int mutex_unlock(struct mutex* obj) ICODE_ATTR;

void wakeup_init(struct wakeup* obj) ICODE_ATTR;

int wakeup_wait(struct wakeup* obj, int timeout) ICODE_ATTR;

int wakeup_signal(struct wakeup* obj) ICODE_ATTR;

void sleep(int usecs) ICODE_ATTR;

#endif