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2003-10-02 Phil Torre <ptorre@zetron.com>

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PR 504/rtems
	* src/newlibc.c: Fix memory allocation of libc extension so it is
	dispatch disabled safe See PR for detailed explanation.
This commit is contained in:
Joel Sherrill
2003-10-02 12:38:52 +00:00
parent dcf4269913
commit 328acbe8d2
2 changed files with 60 additions and 33 deletions
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6
cpukit/libcsupport/ChangeLog
View File

@@ -1,3 +1,9 @@
2003-10-02 Phil Torre <ptorre@zetron.com>
PR 504/rtems
* src/newlibc.c: Fix memory allocation of libc extension so it is
dispatch disabled safe See PR for detailed explanation.
2003-09-26 Till Strauman <strauman@slac.stanford.edu>
PR 498/rtems

85
cpukit/libcsupport/src/newlibc.c
View File

@@ -92,14 +92,61 @@ void libc_wrapup(void)
fclose (stderr);
}
/*
* reent struct allocation moved here from libc_start_hook() to avoid
* mutual exclusion problems when memory is allocated from the start hook.
*
* Memory is also now allocated from the workspace rather than the heap.
* -- ptorre 9/30/03
*/
rtems_boolean libc_create_hook(
rtems_tcb *current_task,
rtems_tcb *creating_task
)
{
creating_task->libc_reent = NULL;
struct _reent *ptr;
/* NOTE: The RTEMS malloc is reentrant without a reent ptr since
* it is based on the Classic API Region Manager.
*/
#define REENT_MALLOCED 0
#if REENT_MALLOCED
ptr = (struct _reent *) calloc(1, sizeof(struct _reent));
#else
/* It is OK to allocate from the workspace because these
* hooks run with thread dispatching disabled.
*/
ptr = (struct _reent *) _Workspace_Allocate(sizeof(struct _reent));
#endif
if (ptr)
{
#ifdef __GNUC__
/* GCC extension: structure constants */
_REENT_INIT_PTR((ptr));
#else
/*
* WARNING: THIS IS VERY DEPENDENT ON NEWLIB!!!
* Last visual check was against newlib 1.8.2 but last known
* use was against 1.7.0. This is basically an exansion of
* REENT_INIT() in <sys/reent.h>.
*/
memset(ptr, 0, sizeof(*ptr));
ptr->_stdin = &ptr->__sf[0];
ptr->_stdout = &ptr->__sf[1];
ptr->_stderr = &ptr->__sf[2];
ptr->_current_locale = "C";
ptr->_new._reent._rand_next = 1;
#endif
creating_task->libc_reent = ptr;
return TRUE;
}
else
return FALSE;
}
/*
@@ -111,36 +158,6 @@ rtems_extension libc_start_hook(
rtems_tcb *starting_task
)
{
struct _reent *ptr;
/* NOTE: The RTEMS malloc is reentrant without a reent ptr since
* it is based on the Classic API Region Manager.
*/
ptr = (struct _reent *) calloc(1, sizeof(struct _reent));
if (!ptr)
rtems_fatal_error_occurred(RTEMS_NO_MEMORY);
#ifdef __GNUC__
/* GCC extension: structure constants */
_REENT_INIT_PTR((ptr));
#else
/*
* WARNING: THIS IS VERY DEPENDENT ON NEWLIB!!!
* Last visual check was against newlib 1.8.2 but last known
* use was against 1.7.0. This is basically an exansion of
* REENT_INIT() in <sys/reent.h>.
* NOTE: calloc() takes care of zeroing fields.
*/
ptr->_stdin = &ptr->__sf[0];
ptr->_stdout = &ptr->__sf[1];
ptr->_stderr = &ptr->__sf[2];
ptr->_current_locale = "C";
ptr->_new._reent._rand_next = 1;
#endif
starting_task->libc_reent = ptr;
}
/*
@@ -200,7 +217,11 @@ rtems_extension libc_delete_hook(
if (ptr && ptr != &libc_global_reent) {
_wrapup_reent(ptr);
_reclaim_reent(ptr);
#if REENT_MALLOCED
free(ptr);
#else
_Workspace_Free(ptr);
#endif
}
deleted_task->libc_reent = NULL;