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/*

 * RTEMS threads compatibily routines for libgcc2.

 *

 * by: Rosimildo da Silva ( rdasilva@connecttel.com

 *

 * Used ideas from:

 *    W. Eric Norum

 *    Canadian Light Source

 *    University of Saskatchewan

 *    Saskatoon, Saskatchewan, CANADA

 *    eric@cls.usask.ca

 *

 * Eric sent some e-mail in the rtems-list as a start point for this

 * module implementation.

 *

 *

 */

/* We might not need, defined just in case */

#define  __RTEMS_INSIDE__  1

#include <stdlib.h>

#include <stdio.h>

#include <rtems.h>

#include <rtems/system.h>

#include <rtems/rtems/tasks.h>

/*

 * These typedefs should match with the ones defined in the file

 * gcc/gthr-rtems.h in the gcc distribution.

 */

typedef void *__gthread_key_t;

typedef int   __gthread_once_t;

typedef void *__gthread_mutex_t;

/* uncomment this if you need to debug this interface */

/*

#define DEBUG_GXX_WRAPPERS 1

*/

/* prototype for the terminate() */

extern void __terminate( void );

#ifdef DEBUG_GXX_WRAPPERS

/* local function to return the ID of the calling thread */

static rtems_id get_tid( void )

{

   rtems_id id = 0;

   rtems_task_ident( RTEMS_SELF, 0, &id );

   return id;

}

#endif

int rtems_gxx_once(__gthread_once_t *once, void (*func) ())

{

#ifdef DEBUG_GXX_WRAPPERS

   printk( "gxx_wrappers: once=%x, func=%x\n", *once, func );

#endif

   if( *once == 0 )

   {

      /*

       * NOTE: could not use the call to disable "preemption", it causes

       * one exception. Somebody might want to investiage it further

       * sometime later.

       */

      _Thread_Disable_dispatch();

      *once = 1;

      (*func)();

      _Thread_Enable_dispatch();

   }

   return 0;

}

int rtems_gxx_key_create (__gthread_key_t *key, void (*dtor) (void *))

{

  /* Ok, this can be a bit tricky. We are going to return a "key" as a

   * pointer to the buffer that will hold the value of the key itself.

   * We have to to this, becuase the others functions on this interface

   * deal with the value of the key, as used with the POSIX API.

   */

   /* Do not pull your hair, trust me this works. :-) */

  __gthread_key_t *new_key = ( __gthread_key_t * )malloc( sizeof( __gthread_key_t ) );

  *key = ( __gthread_key_t )new_key;

  *new_key = NULL;

#ifdef DEBUG_GXX_WRAPPERS

  printk( "gxx_wrappers: create key=%x, dtor=%x, new_key=%x\n", key, dtor, new_key );

#endif

  /* register with RTEMS the buffer that will hold the key values */

  if( rtems_task_variable_add( RTEMS_SELF, (void **)new_key, NULL ) == RTEMS_SUCCESSFUL )

       return 0;

  return -1;

}

int rtems_gxx_key_dtor (__gthread_key_t key, void *ptr)

{

#ifdef DEBUG_GXX_WRAPPERS

  printk( "gxx_wrappers: dtor key=%x, ptr=%x\n", key, ptr );

#endif

   *(void **)key = 0;

   return 0;

}

int rtems_gxx_key_delete (__gthread_key_t key)

{

#ifdef DEBUG_GXX_WRAPPERS

  printk( "gxx_wrappers: delete key=%x\n", key );

#endif

  /* register with RTEMS the buffer that will hold the key values */

  if( rtems_task_variable_delete( RTEMS_SELF, (void **)key ) == RTEMS_SUCCESSFUL )

  {

     if( key ) free( (void *)key );

     return 0;

  }

  return 0;

}

void *rtems_gxx_getspecific(__gthread_key_t key)

{

  void *p= 0;

  /* register with RTEMS the buffer that will hold the key values */

  if( rtems_task_variable_get( RTEMS_SELF, (void **)key, &p ) == RTEMS_SUCCESSFUL )

  {

    /* We do not have to do this, but what the heck ! */

     p= *( void **)key;

  }

  else

  {

    /* fisrt time, always set to zero, it is unknown the value that the others

     * threads are using at the moment of this call

     */

    if( rtems_task_variable_add( RTEMS_SELF, (void **)key, NULL ) != RTEMS_SUCCESSFUL )

    {

       __terminate ();

    }

    *( void ** )key = (void *)0;

  }

#ifdef DEBUG_GXX_WRAPPERS

   printk( "gxx_wrappers: getspecific key=%x, ptr=%x, id=%x\n", key, p, get_tid() );

#endif

   return p;

}

int rtems_gxx_setspecific(__gthread_key_t key, const void *ptr)

{

#ifdef DEBUG_GXX_WRAPPERS

  printk( "gxx_wrappers: setspecific key=%x, ptr=%x, id=%x\n", key, ptr, get_tid() );

#endif

  /* register with RTEMS the buffer that will hold the key values */

  if( rtems_task_variable_add( RTEMS_SELF, (void **)key, NULL ) == RTEMS_SUCCESSFUL )

  {

    /* now let's set the proper value */

    *( void ** )key = (void *)ptr;

     return 0;

  }

  return -1;

}

/*

 * MUTEX support

 */

void rtems_gxx_mutex_init (__gthread_mutex_t *mutex)

{

#ifdef DEBUG_GXX_WRAPPERS

  printk( "gxx_wrappers: mutex init =%X\n", *mutex );

#endif

  if( rtems_semaphore_create( rtems_build_name ('G', 'C', 'C', '2'),

                              1,

                             RTEMS_PRIORITY|RTEMS_BINARY_SEMAPHORE

                             |RTEMS_INHERIT_PRIORITY | RTEMS_NO_PRIORITY_CEILING|RTEMS_LOCAL,

                             0,

                             (rtems_id *)mutex ) != RTEMS_SUCCESSFUL )

  {

      __terminate ();

  }

#ifdef DEBUG_GXX_WRAPPERS

  printk( "gxx_wrappers: mutex init complete =%X\n", *mutex );

#endif

}

int rtems_gxx_mutex_lock (__gthread_mutex_t *mutex)

{

#ifdef DEBUG_GXX_WRAPPERS

  printk( "gxx_wrappers: lock mutex=%X\n", *mutex );

#endif

  return ( rtems_semaphore_obtain( (rtems_id)*mutex,

            RTEMS_WAIT, RTEMS_NO_TIMEOUT ) ==  RTEMS_SUCCESSFUL) ? 0 : -1;

}

int rtems_gxx_mutex_trylock (__gthread_mutex_t *mutex)

{

#ifdef DEBUG_GXX_WRAPPERS

  printk( "gxx_wrappers: trylock mutex=%X\n", *mutex );

#endif

  return (rtems_semaphore_obtain ((rtems_id)*mutex,

               RTEMS_NO_WAIT, 0) == RTEMS_SUCCESSFUL) ? 0 : -1;

}

int rtems_gxx_mutex_unlock (__gthread_mutex_t *mutex)

{

#ifdef DEBUG_GXX_WRAPPERS

   printk( "gxx_wrappers: unlock mutex=%X\n", *mutex );

#endif

  return (rtems_semaphore_release( (rtems_id)*mutex ) ==  RTEMS_SUCCESSFUL) ? 0 :-1;

}