fs/streams: Move the file streams from the group structure into TLS

This is preparation for flushing streams from user space, like it should
be done.

- Move tg_streamlist (group, kernel space) ->
       ta_streamlist (TLS, user space)
- Access stream list via tg_info in kernel
- Access stream list via TLS in user space
- Remove / rename nxsched_get_streams -> lib_getstreams
- Remove system call for nxsched_get_streams

libs/libc/stdio/Make.defs

@@ -45,6 +45,7 @@ CSRCS += lib_fputs.c lib_ungetc.c lib_fprintf.c lib_vfprintf.c
 CSRCS += lib_feof.c lib_ferror.c lib_rewind.c lib_clearerr.c
 CSRCS += lib_scanf.c lib_vscanf.c lib_fscanf.c lib_vfscanf.c lib_tmpfile.c
 CSRCS += lib_setbuf.c lib_setvbuf.c lib_libstream.c lib_libfilelock.c
+CSRCS += lib_libgetstreams.c
 endif
 
 # Add the stdio directory to the build

libs/libc/stdio/lib_fclose.c

@@ -84,7 +84,7 @@ int fclose(FAR FILE *stream)
 
       /* Remove FILE structure from the stream list */
 
-      slist = nxsched_get_streams();
+      slist = lib_get_streams();
       nxmutex_lock(&slist->sl_lock);
 
       for (next = slist->sl_head; next; prev = next, next = next->fs_next)

libs/libc/stdio/lib_fflush.c

@@ -62,7 +62,7 @@ int fflush(FAR FILE *stream)
     {
       /* Yes... then this is a request to flush all streams */
 
-      ret = lib_flushall(nxsched_get_streams());
+      ret = lib_flushall(lib_get_streams());
     }
   else
     {

libs/libc/stdio/lib_libgetstreams.c

@@ -0,0 +1,60 @@
+/****************************************************************************
+ * libs/libc/stdio/lib_libgetstreams.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <assert.h>
+
+#include <nuttx/tls.h>
+
+#ifdef CONFIG_FILE_STREAM
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_get_streams
+ *
+ * Description:
+ *   Return a pointer to the streams list for this thread
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   A pointer to the errno.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+FAR struct streamlist *lib_get_streams(void)
+{
+  FAR struct task_info_s *info;
+
+  info = task_get_info();
+  return &info->ta_streamlist;
+}
+
+#endif /* CONFIG_FILE_STREAM */

libs/libc/stdio/lib_libstream.c

@@ -34,6 +34,7 @@
 #include <nuttx/sched.h>
 #include <nuttx/fs/fs.h>
 #include <nuttx/lib/lib.h>
+#include <nuttx/tls.h>
 
 #include "libc.h"
 
@@ -56,13 +57,8 @@ void lib_stream_initialize(FAR struct task_group_s *group)
 {
   FAR struct streamlist *list;
 
-#ifdef CONFIG_MM_KERNEL_HEAP
-  DEBUGASSERT(group && group->tg_streamlist);
-  list = group->tg_streamlist;
-#else
-  DEBUGASSERT(group);
-  list = &group->tg_streamlist;
-#endif
+  DEBUGASSERT(group && group->tg_info);
+  list = &group->tg_info->ta_streamlist;
 
   /* Initialize the list access mutex */
 
@@ -94,13 +90,8 @@ void lib_stream_release(FAR struct task_group_s *group)
 {
   FAR struct streamlist *list;
 
-#ifdef CONFIG_MM_KERNEL_HEAP
-  DEBUGASSERT(group && group->tg_streamlist);
-  list = group->tg_streamlist;
-#else
-  DEBUGASSERT(group);
-  list = &group->tg_streamlist;
-#endif
+  DEBUGASSERT(group && group->tg_info);
+  list = &group->tg_info->ta_streamlist;
 
   /* Destroy the mutex and release the filelist */