/*
* 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.
*
* $Id$
*/
/*
* This file is only used if using gcc
*/
#if defined(__GNUC__)
#if HAVE_CONFIG_H
#include "config.h"
#endif
/* 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/error.h> /* rtems_panic */
#include <rtems/rtems/tasks.h>
/*
* These typedefs should match with the ones defined in the file
* gcc/gthr-rtems.h in the gcc distribution.
* FIXME: T.S, 2007/01/31: -> gcc/gthr-rtems.h still declares
* void * __gthread_key_t;
*/
typedef struct __gthread_key_ {
void *val; /* this is switched with the task */
void (*dtor)(void*); /* this remains in place for all tasks */
} __gthread_key, *__gthread_key_t;
typedef int __gthread_once_t;
typedef void *__gthread_mutex_t;
typedef void *__gthread_recursive_mutex_t;
/* uncomment this if you need to debug this interface */
/*
#define DEBUG_GXX_WRAPPERS 1
*/
#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) (void))
{
#ifdef DEBUG_GXX_WRAPPERS
printk( "gxx_wrappers: once=%x, func=%x\n", *once, func );
#endif
if( *(volatile __gthread_once_t *)once == 0 )
{
rtems_mode saveMode;
__gthread_once_t o;
rtems_task_mode(RTEMS_NO_PREEMPT, RTEMS_PREEMPT_MASK, &saveMode);
if( (o = *(volatile __gthread_once_t *)once) == 0 )
{
*(volatile __gthread_once_t *)once = 1;
}
rtems_task_mode(saveMode, RTEMS_PREEMPT_MASK, &saveMode);
if ( o == 0 )
(*func)();
}
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, because 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( *new_key ) );
*key = new_key;
new_key->val = NULL;
new_key->dtor = dtor;
#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, dtor ) == 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
key->val = 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 )
{
/* Hmm - hopefully all tasks using this key have gone away... */
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= key->val;
}
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, key->dtor ) != RTEMS_SUCCESSFUL )
{
rtems_panic ("rtems_gxx_getspecific");
}
key->val = (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, key->dtor ) == RTEMS_SUCCESSFUL )
{
/* now let's set the proper value */
key->val = (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 )
{
rtems_panic ("rtems_gxx_mutex_init");
}
#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_destroy (__gthread_mutex_t *mutex)
{
#ifdef DEBUG_GXX_WRAPPERS
printk( "gxx_wrappers: destroy mutex=%X\n", *mutex );
#endif
return ( rtems_semaphore_delete((rtems_id)*mutex)
== 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;
}
void rtems_gxx_recursive_mutex_init(__gthread_recursive_mutex_t *mutex)
{
rtems_gxx_mutex_init(mutex);
}
int rtems_gxx_recursive_mutex_lock(__gthread_recursive_mutex_t *mutex)
{
return rtems_gxx_mutex_lock(mutex);
}
int rtems_gxx_recursive_mutex_trylock(__gthread_recursive_mutex_t *mutex)
{
return rtems_gxx_mutex_trylock(mutex);
}
int rtems_gxx_recursive_mutex_unlock(__gthread_recursive_mutex_t *mutex)
{
return rtems_gxx_mutex_unlock(mutex);
}
#endif /* __GNUC__ */
