source: rtems/cpukit/include/rtems/score/coresem.h @ 21275b58

5
Last change on this file since 21275b58 was 2afb22b, checked in by Chris Johns <chrisj@…>, on 12/23/17 at 07:18:56

Remove make preinstall

A speciality of the RTEMS build system was the make preinstall step. It
copied header files from arbitrary locations into the build tree. The
header files were included via the -Bsome/build/tree/path GCC command
line option.

This has at least seven problems:

  • The make preinstall step itself needs time and disk space.
  • Errors in header files show up in the build tree copy. This makes it hard for editors to open the right file to fix the error.
  • There is no clear relationship between source and build tree header files. This makes an audit of the build process difficult.
  • The visibility of all header files in the build tree makes it difficult to enforce API barriers. For example it is discouraged to use BSP-specifics in the cpukit.
  • An introduction of a new build system is difficult.
  • Include paths specified by the -B option are system headers. This may suppress warnings.
  • The parallel build had sporadic failures on some hosts.

This patch removes the make preinstall step. All installed header
files are moved to dedicated include directories in the source tree.
Let @RTEMS_CPU@ be the target architecture, e.g. arm, powerpc, sparc,
etc. Let @RTEMS_BSP_FAMILIY@ be a BSP family base directory, e.g.
erc32, imx, qoriq, etc.

The new cpukit include directories are:

  • cpukit/include
  • cpukit/score/cpu/@RTEMS_CPU@/include
  • cpukit/libnetworking

The new BSP include directories are:

  • bsps/include
  • bsps/@RTEMS_CPU@/include
  • bsps/@RTEMS_CPU@/@RTEMS_BSP_FAMILIY@/include

There are build tree include directories for generated files.

The include directory order favours the most general header file, e.g.
it is not possible to override general header files via the include path
order.

The "bootstrap -p" option was removed. The new "bootstrap -H" option
should be used to regenerate the "headers.am" files.

Update #3254.
  • Property mode set to 100644
File size: 1.4 KB
Line 
1/**
2 *  @file  rtems/score/coresem.h
3 *
4 *  @brief Data Associated with the Counting Semaphore Handler
5 *
6 *  This include file contains all the constants and structures associated
7 *  with the Counting Semaphore Handler.  A counting semaphore is the
8 *  standard Dijkstra binary semaphore used to provide synchronization
9 *  and mutual exclusion capabilities.
10 */
11
12/*
13 *  COPYRIGHT (c) 1989-2008.
14 *  On-Line Applications Research Corporation (OAR).
15 *
16 *  The license and distribution terms for this file may be
17 *  found in the file LICENSE in this distribution or at
18 *  http://www.rtems.org/license/LICENSE.
19 */
20
21#ifndef _RTEMS_SCORE_CORESEM_H
22#define _RTEMS_SCORE_CORESEM_H
23
24#include <rtems/score/threadq.h>
25
26#ifdef __cplusplus
27extern "C" {
28#endif
29
30/**
31 *  @defgroup ScoreSemaphore Semaphore Handler
32 *
33 *  @ingroup Score
34 *
35 *  This handler encapsulates functionality which provides the foundation
36 *  Semaphore services used in all of the APIs supported by RTEMS.
37 */
38/**@{*/
39
40/**
41 *  The following defines the control block used to manage each
42 *  counting semaphore.
43 */
44typedef struct {
45  /** This field is the Waiting Queue used to manage the set of tasks
46   *  which are blocked waiting to obtain the semaphore.
47   */
48  Thread_queue_Control        Wait_queue;
49
50  /** This element contains the current count of this semaphore. */
51  uint32_t                    count;
52}   CORE_semaphore_Control;
53
54/**@}*/
55
56#ifdef __cplusplus
57}
58#endif
59
60#endif
61/*  end of include file */
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