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-rw-r--r--cpukit/score/src/objectallocate.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/cpukit/score/src/objectallocate.c b/cpukit/score/src/objectallocate.c
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+/*
+ * Object Handler
+ *
+ *
+ * COPYRIGHT (c) 1989-1999.
+ * On-Line Applications Research Corporation (OAR).
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.com/license/LICENSE.
+ *
+ * $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <rtems/score/address.h>
+#include <rtems/score/chain.h>
+#include <rtems/score/object.h>
+#if defined(RTEMS_MULTIPROCESSING)
+#include <rtems/score/objectmp.h>
+#endif
+#include <rtems/score/thread.h>
+#include <rtems/score/wkspace.h>
+#include <rtems/score/sysstate.h>
+#include <rtems/score/isr.h>
+
+/* #define RTEMS_DEBUG_OBJECT_ALLOCATION */
+
+#if defined(RTEMS_DEBUG_OBJECT_ALLOCATION)
+#include <rtems/bspIo.h>
+#endif
+
+/*PAGE
+ *
+ * _Objects_Allocate
+ *
+ * DESCRIPTION:
+ *
+ * This function allocates a object control block from
+ * the inactive chain of free object control blocks.
+ */
+
+Objects_Control *_Objects_Allocate(
+ Objects_Information *information
+)
+{
+ Objects_Control *the_object;
+
+ /*
+ * If the application is using the optional manager stubs and
+ * still attempts to create the object, the information block
+ * should be all zeroed out because it is in the BSS. So let's
+ * check that code for this manager is even present.
+ */
+ if ( information->size == 0 )
+ return NULL;
+
+ /*
+ * OK. The manager should be initialized and configured to have objects.
+ * With any luck, it is safe to attempt to allocate an object.
+ */
+ the_object = (Objects_Control *) _Chain_Get( &information->Inactive );
+
+ if ( information->auto_extend ) {
+ /*
+ * If the list is empty then we are out of objects and need to
+ * extend information base.
+ */
+
+ if ( !the_object ) {
+ _Objects_Extend_information( information );
+ the_object = (Objects_Control *) _Chain_Get( &information->Inactive );
+ }
+
+ if ( the_object ) {
+ uint32_t block;
+
+ block = (uint32_t) _Objects_Get_index( the_object->id ) -
+ _Objects_Get_index( information->minimum_id );
+ block /= information->allocation_size;
+
+ information->inactive_per_block[ block ]--;
+ information->inactive--;
+ }
+ }
+
+#if defined(RTEMS_DEBUG_OBJECT_ALLOCATION)
+ if ( !the_object ) {
+ printk(
+ "OBJECT ALLOCATION FAILURE! API/Class %d/%d\n",
+ information->the_api,
+ information->the_class
+ );
+ }
+#endif
+
+ return the_object;
+}