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2002-05-15 Chris Johns <ccj@acm.org>

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* libc/newlibc.c: Per PR141, move the C library re-enterrant
	support directly into the thread dispatch code. RTEMS needs
	libc and so requiring libc to use a user extension with its
	overhead is not the best solution. This patch lowers the
	overhead to 2 pointer moves.
This commit is contained in:
Joel Sherrill
2002-05-15 16:29:05 +00:00
parent 0df8293e2b
commit c0d4abe6b0
4 changed files with 26 additions and 105 deletions
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41
c/src/exec/libcsupport/src/newlibc.c
View File

@@ -44,18 +44,6 @@
#include <stdio.h>
#endif
static int extension_index;
/*
* Private routines
*/
#define set_newlib_extension( _the_thread, _value ) \
(_the_thread)->extensions[ extension_index ] = (_value);
#define get_newlib_extension( _the_thread ) \
(_the_thread)->extensions[ extension_index ]
int libc_reentrant; /* do we think we are reentrant? */
struct _reent libc_global_reent;
@@ -114,7 +102,7 @@ rtems_boolean libc_create_hook(
rtems_tcb *creating_task
)
{
set_newlib_extension( creating_task, NULL );
creating_task->libc_reent = NULL;
return TRUE;
}
@@ -156,7 +144,7 @@ rtems_extension libc_start_hook(
ptr->_new._reent._rand_next = 1;
#endif
set_newlib_extension( starting_task, ptr );
starting_task->libc_reent = ptr;
}
/*
@@ -170,22 +158,6 @@ rtems_extension libc_begin_hook(rtems_tcb *current_task)
}
#endif
rtems_extension libc_switch_hook(
rtems_tcb *current_task,
rtems_tcb *heir_task
)
{
/*
* Don't touch the outgoing task if it has been deleted.
*/
if ( !_States_Is_transient( current_task->current_state ) ) {
set_newlib_extension( current_task, _REENT );
}
_REENT = (struct _reent *) get_newlib_extension( heir_task );
}
/*
* Function: libc_delete_hook
* Created: 94/12/10
@@ -225,7 +197,7 @@ rtems_extension libc_delete_hook(
if (current_task == deleted_task) {
ptr = _REENT;
} else {
ptr = (struct _reent *) get_newlib_extension( deleted_task );
ptr = (struct _reent *) deleted_task->libc_reent;
}
/* if (ptr) */
@@ -235,7 +207,7 @@ rtems_extension libc_delete_hook(
free(ptr);
}
set_newlib_extension( deleted_task, NULL );
deleted_task->libc_reent = NULL;
/*
* Require the switch back to another task to install its own
@@ -294,16 +266,16 @@ libc_init(int reentrant)
#ifdef NEED_SETVBUF
libc_extension.thread_begin = libc_begin_hook;
#endif
libc_extension.thread_switch = libc_switch_hook;
libc_extension.thread_delete = libc_delete_hook;
_Thread_Set_libc_reent ((void**) &_REENT);
rc = rtems_extension_create(rtems_build_name('L', 'I', 'B', 'C'),
&libc_extension, &extension_id);
if (rc != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred( rc );
libc_reentrant = reentrant;
extension_index = rtems_get_index( extension_id );
}
}
@@ -359,5 +331,4 @@ void exit(int status)
}
#endif
#endif

8
c/src/lib/ChangeLog
View File

@@ -1,3 +1,11 @@
2002-05-15 Chris Johns <ccj@acm.org>
* libc/newlibc.c: Per PR141, move the C library re-enterrant
support directly into the thread dispatch code. RTEMS needs
libc and so requiring libc to use a user extension with its
overhead is not the best solution. This patch lowers the
overhead to 2 pointer moves.
2001-05-15 Joel Sherrill <joel@OARcorp.com>
* libc/Makefile.am: envlock.c should only be built for embedded

41
c/src/lib/libc/newlibc.c
View File

@@ -44,18 +44,6 @@
#include <stdio.h>
#endif
static int extension_index;
/*
* Private routines
*/
#define set_newlib_extension( _the_thread, _value ) \
(_the_thread)->extensions[ extension_index ] = (_value);
#define get_newlib_extension( _the_thread ) \
(_the_thread)->extensions[ extension_index ]
int libc_reentrant; /* do we think we are reentrant? */
struct _reent libc_global_reent;
@@ -114,7 +102,7 @@ rtems_boolean libc_create_hook(
rtems_tcb *creating_task
)
{
set_newlib_extension( creating_task, NULL );
creating_task->libc_reent = NULL;
return TRUE;
}
@@ -156,7 +144,7 @@ rtems_extension libc_start_hook(
ptr->_new._reent._rand_next = 1;
#endif
set_newlib_extension( starting_task, ptr );
starting_task->libc_reent = ptr;
}
/*
@@ -170,22 +158,6 @@ rtems_extension libc_begin_hook(rtems_tcb *current_task)
}
#endif
rtems_extension libc_switch_hook(
rtems_tcb *current_task,
rtems_tcb *heir_task
)
{
/*
* Don't touch the outgoing task if it has been deleted.
*/
if ( !_States_Is_transient( current_task->current_state ) ) {
set_newlib_extension( current_task, _REENT );
}
_REENT = (struct _reent *) get_newlib_extension( heir_task );
}
/*
* Function: libc_delete_hook
* Created: 94/12/10
@@ -225,7 +197,7 @@ rtems_extension libc_delete_hook(
if (current_task == deleted_task) {
ptr = _REENT;
} else {
ptr = (struct _reent *) get_newlib_extension( deleted_task );
ptr = (struct _reent *) deleted_task->libc_reent;
}
/* if (ptr) */
@@ -235,7 +207,7 @@ rtems_extension libc_delete_hook(
free(ptr);
}
set_newlib_extension( deleted_task, NULL );
deleted_task->libc_reent = NULL;
/*
* Require the switch back to another task to install its own
@@ -294,16 +266,16 @@ libc_init(int reentrant)
#ifdef NEED_SETVBUF
libc_extension.thread_begin = libc_begin_hook;
#endif
libc_extension.thread_switch = libc_switch_hook;
libc_extension.thread_delete = libc_delete_hook;
_Thread_Set_libc_reent ((void**) &_REENT);
rc = rtems_extension_create(rtems_build_name('L', 'I', 'B', 'C'),
&libc_extension, &extension_id);
if (rc != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred( rc );
libc_reentrant = reentrant;
extension_index = rtems_get_index( extension_id );
}
}
@@ -359,5 +331,4 @@ void exit(int status)
}
#endif
#endif

41
cpukit/libcsupport/src/newlibc.c
View File

@@ -44,18 +44,6 @@
#include <stdio.h>
#endif
static int extension_index;
/*
* Private routines
*/
#define set_newlib_extension( _the_thread, _value ) \
(_the_thread)->extensions[ extension_index ] = (_value);
#define get_newlib_extension( _the_thread ) \
(_the_thread)->extensions[ extension_index ]
int libc_reentrant; /* do we think we are reentrant? */
struct _reent libc_global_reent;
@@ -114,7 +102,7 @@ rtems_boolean libc_create_hook(
rtems_tcb *creating_task
)
{
set_newlib_extension( creating_task, NULL );
creating_task->libc_reent = NULL;
return TRUE;
}
@@ -156,7 +144,7 @@ rtems_extension libc_start_hook(
ptr->_new._reent._rand_next = 1;
#endif
set_newlib_extension( starting_task, ptr );
starting_task->libc_reent = ptr;
}
/*
@@ -170,22 +158,6 @@ rtems_extension libc_begin_hook(rtems_tcb *current_task)
}
#endif
rtems_extension libc_switch_hook(
rtems_tcb *current_task,
rtems_tcb *heir_task
)
{
/*
* Don't touch the outgoing task if it has been deleted.
*/
if ( !_States_Is_transient( current_task->current_state ) ) {
set_newlib_extension( current_task, _REENT );
}
_REENT = (struct _reent *) get_newlib_extension( heir_task );
}
/*
* Function: libc_delete_hook
* Created: 94/12/10
@@ -225,7 +197,7 @@ rtems_extension libc_delete_hook(
if (current_task == deleted_task) {
ptr = _REENT;
} else {
ptr = (struct _reent *) get_newlib_extension( deleted_task );
ptr = (struct _reent *) deleted_task->libc_reent;
}
/* if (ptr) */
@@ -235,7 +207,7 @@ rtems_extension libc_delete_hook(
free(ptr);
}
set_newlib_extension( deleted_task, NULL );
deleted_task->libc_reent = NULL;
/*
* Require the switch back to another task to install its own
@@ -294,16 +266,16 @@ libc_init(int reentrant)
#ifdef NEED_SETVBUF
libc_extension.thread_begin = libc_begin_hook;
#endif
libc_extension.thread_switch = libc_switch_hook;
libc_extension.thread_delete = libc_delete_hook;
_Thread_Set_libc_reent ((void**) &_REENT);
rc = rtems_extension_create(rtems_build_name('L', 'I', 'B', 'C'),
&libc_extension, &extension_id);
if (rc != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred( rc );
libc_reentrant = reentrant;
extension_index = rtems_get_index( extension_id );
}
}
@@ -359,5 +331,4 @@ void exit(int status)
}
#endif
#endif