libcsupport/src/libio_init.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  *  @file
0005  *
0006  *  @brief RTEMS LibIO Initialization
0007  *  @ingroup LibIO
0008  */
0009
0010 /*
0011  *  COPYRIGHT (c) 1989-2010.
0012  *  On-Line Applications Research Corporation (OAR).
0013  *
0014  * Redistribution and use in source and binary forms, with or without
0015  * modification, are permitted provided that the following conditions
0016  * are met:
0017  * 1. Redistributions of source code must retain the above copyright
0018  *    notice, this list of conditions and the following disclaimer.
0019  * 2. Redistributions in binary form must reproduce the above copyright
0020  *    notice, this list of conditions and the following disclaimer in the
0021  *    documentation and/or other materials provided with the distribution.
0022  *
0023  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0024  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0025  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0026  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0027  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0028  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0029  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0030  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0031  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0032  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0033  * POSSIBILITY OF SUCH DAMAGE.
0034  */
0035
0036 #ifdef HAVE_CONFIG_H
0037 #include "config.h"
0038 #endif
0039
0040 #include <rtems/libio_.h>
0041
0042 #include <pthread.h>
0043
0044 #include <rtems/sysinit.h>
0045 #include <rtems/score/apimutex.h>
0046
0047 /*
0048  *  File descriptor Table Information
0049  */
0050
0051 static API_Mutex_Control rtems_libio_mutex = API_MUTEX_INITIALIZER( "_Libio" );
0052
0053 void rtems_libio_lock( void )
0054 {
0055   _API_Mutex_Lock( &rtems_libio_mutex );
0056 }
0057
0058 void rtems_libio_unlock( void )
0059 {
0060   _API_Mutex_Unlock( &rtems_libio_mutex );
0061 }
0062
0063 void *rtems_libio_iop_free_head;
0064
0065 void **rtems_libio_iop_free_tail = &rtems_libio_iop_free_head;
0066
0067 static void rtems_libio_init( void )
0068 {
0069     uint32_t i;
0070     rtems_libio_t *iop;
0071
0072     if (rtems_libio_number_iops > 0)
0073     {
0074         iop = rtems_libio_iop_free_head = &rtems_libio_iops[0];
0075         for (i = 0 ; (i + 1) < rtems_libio_number_iops ; i++, iop++)
0076           iop->data1 = iop + 1;
0077         iop->data1 = NULL;
0078         rtems_libio_iop_free_tail = &iop->data1;
0079     }
0080 }
0081
0082 RTEMS_SYSINIT_ITEM(
0083   rtems_libio_init,
0084   RTEMS_SYSINIT_LIBIO,
0085   RTEMS_SYSINIT_ORDER_MIDDLE
0086 );