source: rtems/cpukit/score/src/coretodget.c @ d50acdbb

4.11
Last change on this file since d50acdbb was d50acdbb, checked in by Sebastian Huber <sebastian.huber@…>, on Mar 10, 2014 at 7:25:32 AM

score: Add local context to SMP lock API

Add a local context structure to the SMP lock API for acquire and
release pairs. This context can be used to store the ISR level and
profiling information. It may be later used to enable more
sophisticated lock algorithms, e.g. MCS locks.

There is only one lock that cannot be used with a local context. This
is the per-CPU lock since here we would have to transfer the local
context through a context switch which is very complicated.

  • Property mode set to 100644
File size: 1.0 KB
Line 
1/**
2 *  @file
3 *
4 *  @brief Returns a Current TOD with Nanosecond Granularity
5 *  @ingroup ScoreTODConstants
6 */
7
8/*
9 *  COPYRIGHT (c) 1989-2008.
10 *  On-Line Applications Research Corporation (OAR).
11 *
12 *  The license and distribution terms for this file may be
13 *  found in the file LICENSE in this distribution or at
14 *  http://www.rtems.com/license/LICENSE.
15 */
16
17#if HAVE_CONFIG_H
18  #include "config.h"
19#endif
20
21#include <rtems/score/todimpl.h>
22#include <rtems/score/isrlevel.h>
23
24Timestamp_Control *_TOD_Get_with_nanoseconds(
25  Timestamp_Control *snapshot,
26  const Timestamp_Control *clock
27)
28{
29  TOD_Control      *tod = &_TOD;
30  ISR_lock_Context  lock_context;
31  Timestamp_Control offset;
32  Timestamp_Control now;
33  uint32_t          nanoseconds;
34
35  _TOD_Acquire( tod, &lock_context );
36    nanoseconds = ( *tod->nanoseconds_since_last_tick )();
37    now = *clock;
38  _TOD_Release( tod, &lock_context );
39
40  _Timestamp_Set( &offset, 0, nanoseconds );
41  _Timestamp_Add_to( &now, &offset );
42
43  *snapshot = now;
44
45  return snapshot;
46}
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