/**
* @file
*
* @brief RTEMS Threads Compatibility Routines for Libgcc2
* @ingroup GxxWrappersSupport
*/
/*
* 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.
*/
/*
* This file is only used if using gcc
*/
#if defined(__GNUC__)
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/gxx_wrappers.h>
#include <rtems/score/onceimpl.h>
#include <stdlib.h>
#include <rtems.h>
/* uncomment this if you need to debug this interface */
/*#define DEBUG_GXX_WRAPPERS 1*/
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
return _Once( once, func );
}
int rtems_gxx_key_create (__gthread_key_t *key, void (*dtor) (void *))
{
rtems_status_code status;
/* 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 */
status = rtems_task_variable_add( RTEMS_SELF, (void **)new_key, dtor );
if ( status == RTEMS_SUCCESSFUL )
return 0;
free( new_key );
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)
{
rtems_status_code status;
#ifdef DEBUG_GXX_WRAPPERS
printk( "gxx_wrappers: delete key=%x\n", key );
#endif
/* register with RTEMS the buffer that will hold the key values */
status = rtems_task_variable_delete( RTEMS_SELF, (void **)key );
if ( status == RTEMS_SUCCESSFUL ) {
/* Hmm - hopefully all tasks using this key have gone away... */
if ( key ) free( *(void **)key );
return 0;
}
key = NULL;
return 0;
}
void *rtems_gxx_getspecific(__gthread_key_t key)
{
rtems_status_code status;
void *p= 0;
/* register with RTEMS the buffer that will hold the key values */
status = rtems_task_variable_get( RTEMS_SELF, (void **)key, &p );
if ( status == 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
*/
status = rtems_task_variable_add( RTEMS_SELF, (void **)key, key->dtor );
if ( status != RTEMS_SUCCESSFUL ) {
_Terminate(
INTERNAL_ERROR_CORE,
true,
INTERNAL_ERROR_GXX_KEY_ADD_FAILED
);
}
key->val = (void *)0;
}
#ifdef DEBUG_GXX_WRAPPERS
printk(
"gxx_wrappers: getspecific key=%x, ptr=%x, id=%x\n",
key,
p,
rtems_task_self()
);
#endif
return p;
}
int rtems_gxx_setspecific(__gthread_key_t key, const void *ptr)
{
rtems_status_code status;
#ifdef DEBUG_GXX_WRAPPERS
printk(
"gxx_wrappers: setspecific key=%x, ptr=%x, id=%x\n",
key,
ptr,
rtems_task_self()
);
#endif
/* register with RTEMS the buffer that will hold the key values */
status = rtems_task_variable_add( RTEMS_SELF, (void **)key, key->dtor );
if ( status == 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)
{
rtems_status_code status;
#ifdef DEBUG_GXX_WRAPPERS
printk( "gxx_wrappers: mutex init =%X\n", *mutex );
#endif
status = 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
);
if ( status != RTEMS_SUCCESSFUL ) {
#ifdef DEBUG_GXX_WRAPPERS
printk(
"gxx_wrappers: mutex init failed %s (%d)\n",
rtems_status_text(status),
status
);
#endif
_Terminate(
INTERNAL_ERROR_CORE,
true,
INTERNAL_ERROR_GXX_MUTEX_INIT_FAILED
);
}
#ifdef DEBUG_GXX_WRAPPERS
printk( "gxx_wrappers: mutex init complete =%X\n", *mutex );
#endif
}
int rtems_gxx_mutex_lock (__gthread_mutex_t *mutex)
{
rtems_status_code status;
#ifdef DEBUG_GXX_WRAPPERS
printk( "gxx_wrappers: lock mutex=%X\n", *mutex );
#endif
status = rtems_semaphore_obtain(
*(rtems_id *)mutex,
RTEMS_WAIT,
RTEMS_NO_TIMEOUT
);
if ( status == RTEMS_SUCCESSFUL )
return 0;
return -1;
}
int rtems_gxx_mutex_destroy (__gthread_mutex_t *mutex)
{
rtems_status_code status;
#ifdef DEBUG_GXX_WRAPPERS
printk( "gxx_wrappers: destroy mutex=%X\n", *mutex );
#endif
status = rtems_semaphore_delete(*(rtems_id *)mutex);
if ( status == RTEMS_SUCCESSFUL )
return 0;
return -1;
}
int rtems_gxx_mutex_trylock (__gthread_mutex_t *mutex)
{
rtems_status_code status;
#ifdef DEBUG_GXX_WRAPPERS
printk( "gxx_wrappers: trylock mutex=%X\n", *mutex );
#endif
status = rtems_semaphore_obtain (*(rtems_id *)mutex, RTEMS_NO_WAIT, 0);
if ( status == RTEMS_SUCCESSFUL )
return 0;
return -1;
}
int rtems_gxx_mutex_unlock (__gthread_mutex_t *mutex)
{
rtems_status_code status;
#ifdef DEBUG_GXX_WRAPPERS
printk( "gxx_wrappers: unlock mutex=%X\n", *mutex );
#endif
status = rtems_semaphore_release( *(rtems_id *)mutex );
if ( status == RTEMS_SUCCESSFUL )
return 0;
return -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__ */
