pthread.h

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/**
 * \file ucos2_pthread.h
 * \author Wei Yongming <[e-mail]>
 * \date 2003/02/03
 * 
 * Description:   This header contains the pthread definitions needed to 
 *                support MiniGUI under uC/OS-II. 
 *
 \verbatim
    Copyright (C) 2004 Feynman Software.

    This file is part of MiniGUI, a compact cross-platform Graphics 
    User Interface (GUI) support system for real-time embedded systems.

    This program 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.

    This program 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 this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 \endverbatim
 */

/*
 * $Id: ucos2_pthread.h,v 1.5 2004/10/20 02:02:11 weiym Exp $
 *
 *             MiniGUI for Linux/uClinux, eCos, uC/OS-II, VxWorks version 1.6.x
 *             Copyright (C) 1998-2002 Wei Yongming.
 *             Copyright (C) 2002-2004 Feynman Software.
 */

#ifndef UCOSII_PTHREAD_H
#define UCOSII_PTHREAD_H

#include "common.h"

#ifdef __UCOSII__

#include <stddef.h>

//=============================================================================
// Tunable macros

#define NR_POSIX_PTHREAD_THREADS_MAX    16      // This can not be less than 5.
#define HIGHEST_UCOSII_PTHREAD_PRIORITY 16
#define LOWEST_UCOSII_PTHREAD_PRIORITY  (HIGHEST_UCOSII_PTHREAD_PRIORITY + NR_POSIX_PTHREAD_THREADS_MAX - 1)

#undef PTHREAD_KEYS_MAX
#define PTHREAD_KEYS_MAX                64

#undef PTHREAD_STACK_MIN
#define PTHREAD_STACK_MIN               (PTHREAD_KEYS_MAX * sizeof(void *) + 1024*8)

#undef PTHREAD_DESTRUCTOR_ITERATIONS
#define PTHREAD_DESTRUCTOR_ITERATIONS  4

#define UCOSII_THREAD_LOWEST_PRIORITY   64

//-----------------------------------------------------------------------------
// Internal types

#define pthread_t ucos2_pthread_t
#define pthread_key_t ucos2_pthread_key_t
#define pthread_once_t ucos2_pthread_once_t
#define pthread_attr_t ucos2_pthread_attr_t
#define pthread_mutex_t ucos2_pthread_mutex_t
#define pthread_mutexattr_t ucos2_pthread_mutexattr_t

//-----------------------------------------------------------------------------
// Basic types.

typedef unsigned int pthread_t;
typedef int pthread_key_t;
typedef int pthread_once_t;

//-----------------------------------------------------------------------------
// Scheduling parameters. At present only the priority is defined.

struct sched_param
{
    int                 prio;
};

//-----------------------------------------------------------------------------
// Thread attribute structure.

typedef struct pthread_attr_t
{
    unsigned int        detachstate:2,
#if 0 /* not support in uC/OS-II */
                        scope:2,
                        inheritsched:2,
                        schedpolicy:2,
#endif /* not support in uC/OS-II */
                        stackaddr_valid:1,
                        stacksize_valid:1;
    struct sched_param  schedparam;
    void                *stackaddr;
    size_t              stacksize;
} pthread_attr_t;

// Values for detachstate
#define PTHREAD_CREATE_JOINABLE	        1
#define PTHREAD_CREATE_DETACHED	        2

#if 0 /* not support in uC/OS-II */

// Values for scope
#define PTHREAD_SCOPE_SYSTEM            1
#define PTHREAD_SCOPE_PROCESS           2

// Values for inheritsched
#define PTHREAD_INHERIT_SCHED           1
#define PTHREAD_EXPLICIT_SCHED          2

#endif /* not support in uC/OS-II */

//=============================================================================
// General thread operations

//-----------------------------------------------------------------------------
// Thread creation and management.

// Create a thread.
int pthread_create ( pthread_t *thread,
                             const pthread_attr_t *attr,
                             void *(*start_routine) (void *),
                             void *arg);

// Get current thread id.
pthread_t pthread_self ( void );

// Compare two thread identifiers.
int pthread_equal (pthread_t thread1, pthread_t thread2);

// Terminate current thread.
void pthread_exit (void *retval);

// Wait for the thread to terminate. If thread_return is not NULL then
// the retval from the thread's call to pthread_exit() is stored at
// *thread_return.
int pthread_join (pthread_t thread, void **thread_return);

// Set the detachstate of the thread to "detached". The thread then does not
// need to be joined and its resources will be freed when it exits.
int pthread_detach (pthread_t thread);

#if 0 /* not support in uC/OS-II */
//-----------------------------------------------------------------------------
// Thread scheduling controls

// Set scheduling policy and parameters for the thread
int pthread_setschedparam (pthread_t thread,
                                   int policy,
                                   const struct sched_param *param);

// Get scheduling policy and parameters for the thread
int pthread_getschedparam (pthread_t thread,
                                   int *policy,
                                   struct sched_param *param);
#endif /* not support in uC/OS-II */


//-----------------------------------------------------------------------------
// Thread attribute handling.

// Initialize attributes object with default attributes:
// detachstate          == PTHREAD_JOINABLE
// scope                == PTHREAD_SCOPE_SYSTEM
// inheritsched         == PTHREAD_EXPLICIT_SCHED
// schedpolicy          == SCHED_OTHER
// schedparam           == unset
// stackaddr            == unset
// stacksize            == 0
// 
int pthread_attr_init (pthread_attr_t *attr);

// Destroy thread attributes object
int pthread_attr_destroy (pthread_attr_t *attr);


// Set the detachstate attribute
int pthread_attr_setdetachstate (pthread_attr_t *attr,
                                         int detachstate);

// Get the detachstate attribute
int pthread_attr_getdetachstate (const pthread_attr_t *attr,
                                         int *detachstate);


// Set scheduling contention scope
int pthread_attr_setscope (pthread_attr_t *attr, int scope);

// Get scheduling contention scope
int pthread_attr_getscope (const pthread_attr_t *attr, int *scope);


// Set scheduling inheritance attribute
int pthread_attr_setinheritsched (pthread_attr_t *attr, int inherit);

// Get scheduling inheritance attribute
int pthread_attr_getinheritsched (const pthread_attr_t *attr,
                                          int *inherit);


// Set scheduling policy
int pthread_attr_setschedpolicy (pthread_attr_t *attr, int policy);

// Get scheduling policy
int pthread_attr_getschedpolicy (const pthread_attr_t *attr,
                                         int *policy);


// Set scheduling parameters
int pthread_attr_setschedparam (pthread_attr_t *attr,
				        const struct sched_param *param);

// Get scheduling parameters
int pthread_attr_getschedparam (const pthread_attr_t *attr,
                                        struct sched_param *param);


// Set starting address of stack. Whether this is at the start or end of
// the memory block allocated for the stack depends on whether the stack
// grows up or down.
int pthread_attr_setstackaddr (pthread_attr_t *attr, void *stackaddr);

// Get any previously set stack address.
int pthread_attr_getstackaddr (const pthread_attr_t *attr,
                                       void **stackaddr);


// Set minimum creation stack size.