[PATCH 2/5] posix: shared memory support

Chris Johns chrisj at rtems.org
Wed Aug 24 01:49:00 UTC 2016


On 18/08/2016 6:02 AM, Gedare Bloom wrote:
> Add POSIX shared memory manager (Shm).
> ---
>  cpukit/posix/Makefile.am                      |   3 +
>  cpukit/posix/include/rtems/posix/config.h     |   5 +
>  cpukit/posix/include/rtems/posix/shm.h        |  61 ++++++++
>  cpukit/posix/include/rtems/posix/shmimpl.h    |  90 ++++++++++++
>  cpukit/posix/preinstall.am                    |   8 ++
>  cpukit/posix/src/shm.c                        |  48 +++++++
>  cpukit/posix/src/shmopen.c                    | 197 +++++++++++++++++++++++++-
>  cpukit/rtems/src/rtemsobjectgetapiclassname.c |   1 +
>  cpukit/sapi/include/confdefs.h                |  28 ++++
>  cpukit/score/include/rtems/score/objectimpl.h |   5 +-
>  cpukit/score/include/rtems/sysinit.h          |   1 +
>  testsuites/psxtests/psxshm01/system.h         |   2 +-
>  testsuites/sptests/spsysinit01/init.c         |  17 +++
>  13 files changed, 459 insertions(+), 7 deletions(-)
>  create mode 100644 cpukit/posix/include/rtems/posix/shm.h
>  create mode 100644 cpukit/posix/include/rtems/posix/shmimpl.h
>  create mode 100644 cpukit/posix/src/shm.c
>
> diff --git a/cpukit/posix/Makefile.am b/cpukit/posix/Makefile.am
> index c7620df..5490401 100644
> --- a/cpukit/posix/Makefile.am
> +++ b/cpukit/posix/Makefile.am
> @@ -43,6 +43,8 @@ include_rtems_posix_HEADERS += include/rtems/posix/psignalimpl.h
>  include_rtems_posix_HEADERS += include/rtems/posix/pthread.h
>  include_rtems_posix_HEADERS += include/rtems/posix/pthreadimpl.h
>  include_rtems_posix_HEADERS += include/rtems/posix/ptimer.h
> +include_rtems_posix_HEADERS += include/rtems/posix/shm.h
> +include_rtems_posix_HEADERS += include/rtems/posix/shmimpl.h
>  include_rtems_posix_HEADERS += include/rtems/posix/semaphore.h
>  include_rtems_posix_HEADERS += include/rtems/posix/semaphoreimpl.h
>  include_rtems_posix_HEADERS += include/rtems/posix/threadsup.h
> @@ -100,6 +102,7 @@ libposix_a_SOURCES += src/munlockall.c
>  libposix_a_SOURCES += src/munlock.c
>  libposix_a_SOURCES += src/munmap.c
>  libposix_a_SOURCES += src/posix_madvise.c
> +libposix_a_SOURCES += src/shm.c
>  libposix_a_SOURCES += src/shmopen.c
>  libposix_a_SOURCES += src/shmunlink.c
>
> diff --git a/cpukit/posix/include/rtems/posix/config.h b/cpukit/posix/include/rtems/posix/config.h
> index 636f1e7..0a1c4e0 100644
> --- a/cpukit/posix/include/rtems/posix/config.h
> +++ b/cpukit/posix/include/rtems/posix/config.h
> @@ -111,6 +111,11 @@ typedef struct {
>    uint32_t                            maximum_rwlocks;
>
>    /**
> +   * Maximum configured number of POSIX Shared memory objects.
> +   */
> +  uint32_t                            maximum_shms;
> +
> +  /**
>     * This field contains the maximum number of POSIX API
>     * spinlocks which are configured for this application.
>     */
> diff --git a/cpukit/posix/include/rtems/posix/shm.h b/cpukit/posix/include/rtems/posix/shm.h
> new file mode 100644
> index 0000000..41557b1
> --- /dev/null
> +++ b/cpukit/posix/include/rtems/posix/shm.h
> @@ -0,0 +1,61 @@
> +/**
> + * @file
> + *
> + * @brief Internal Support for POSIX Shared Memory
> + */
> +
> +/*
> + * Copyright (c) 2016 Gedare Bloom.
> + *
> + * The license and distribution terms for this file may be
> + * found in the file LICENSE in this distribution or at
> + * http://www.rtems.org/license/LICENSE.
> + */
> +
> +#ifndef _RTEMS_POSIX_SHM_H
> +#define _RTEMS_POSIX_SHM_H
> +
> +#include <rtems/score/object.h>
> +#include <rtems/score/threadq.h>
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +/**
> + * @defgroup POSIXShmPrivate POSIX Shared Memory Private Support
> + *
> + * @ingroup POSIXAPI
> + *
> + * Internal implementation support for POSIX shared memory.
> + * @{
> + */
> +
> +typedef struct {
> +   Objects_Control      Object;
> +   Thread_queue_Control Wait_queue;
> +
> +   int                  reference_count;
> +
> +   void                *shm_object;
> +   size_t               shm_object_size;
> +   void                *( *shm_object_allocate )( size_t size );
> +   void                 ( *shm_object_free ) ( void *ptr );
> +
> +   uid_t                uid;
> +   gid_t                gid;
> +   mode_t               mode;
> +
> +   time_t               atime;
> +   time_t               mtime;
> +   time_t               ctime;
> +
> +} POSIX_Shm_Control;
> +
> +/** @} */
> +
> +#ifdef __cplusplus
> +}
> +#endif
> +
> +#endif
> diff --git a/cpukit/posix/include/rtems/posix/shmimpl.h b/cpukit/posix/include/rtems/posix/shmimpl.h
> new file mode 100644
> index 0000000..2df4bd3
> --- /dev/null
> +++ b/cpukit/posix/include/rtems/posix/shmimpl.h
> @@ -0,0 +1,90 @@
> +/**
> + * @file
> + *
> + * @brief Private Support Information for POSIX Shared Memory
> + *
> + */
> +
> +/*
> + * Copyright (c) 2016 Gedare Bloom.
> + *
> + * The license and distribution terms for this file may be
> + * found in the file LICENSE in this distribution or at
> + * http://www.rtems.org/license/LICENSE.
> + */
> +
> +#ifndef _RTEMS_POSIX_SHMIMPL_H
> +#define _RTEMS_POSIX_SHMIMPL_H
> +
> +#include <rtems/posix/posixapi.h>
> +#include <rtems/posix/shm.h>
> +#include <rtems/score/objectimpl.h>
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +/**
> + * @ingroup POSIXShmPrivate
> + * @{
> + */
> +
> +extern Objects_Information _POSIX_Shm_Information;
> +
> +RTEMS_INLINE_ROUTINE void _POSIX_Shm_Acquire_critical(
> +  POSIX_Shm_Control                 *the_shm,
> +  Thread_queue_Context              *queue_context
> +)
> +{
> +  _Thread_queue_Acquire_critical(
> +    &the_shm->Wait_queue,
> +    &queue_context->Lock_context
> +  );
> +}
> +
> +RTEMS_INLINE_ROUTINE void _POSIX_Shm_Release(
> +  POSIX_Shm_Control                 *the_shm,
> +  Thread_queue_Context              *queue_context
> +)
> +{
> +  _Thread_queue_Release( &the_shm->Wait_queue, &queue_context->Lock_context );
> +}
> +
> +RTEMS_INLINE_ROUTINE POSIX_Shm_Control *_POSIX_Shm_Allocate_unprotected( void )
> +{
> +  return (POSIX_Shm_Control *)
> +    _Objects_Allocate_unprotected( &_POSIX_Shm_Information );
> +}
> +
> +/**
> + * @brief POSIX Shared Memory Free
> + *
> + * This routine frees a shm control block.
> + */
> +RTEMS_INLINE_ROUTINE void _POSIX_Shm_Free (
> +  POSIX_Shm_Control *the_shm
> +)
> +{
> +  _Objects_Free( &_POSIX_Shm_Information, &the_shm->Object );
> +}
> +
> +RTEMS_INLINE_ROUTINE POSIX_Shm_Control *_POSIX_Shm_Get_by_name(
> +  const char                *name,
> +  size_t                    *name_length_p,
> +  Objects_Get_by_name_error *error
> +)
> +{
> +  return (POSIX_Shm_Control *) _Objects_Get_by_name(
> +    &_POSIX_Shm_Information,
> +    name,
> +    name_length_p,
> +    error
> +  );
> +}
> +/** @} */
> +
> +#ifdef __cplusplus
> +}
> +#endif
> +
> +#endif
> diff --git a/cpukit/posix/preinstall.am b/cpukit/posix/preinstall.am
> index 1d035e7..5863860 100644
> --- a/cpukit/posix/preinstall.am
> +++ b/cpukit/posix/preinstall.am
> @@ -109,6 +109,14 @@ $(PROJECT_INCLUDE)/rtems/posix/ptimer.h: include/rtems/posix/ptimer.h $(PROJECT_
>  	$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/rtems/posix/ptimer.h
>  PREINSTALL_FILES += $(PROJECT_INCLUDE)/rtems/posix/ptimer.h
>
> +$(PROJECT_INCLUDE)/rtems/posix/shm.h: include/rtems/posix/shm.h $(PROJECT_INCLUDE)/rtems/posix/$(dirstamp)
> +	$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/rtems/posix/shm.h
> +PREINSTALL_FILES += $(PROJECT_INCLUDE)/rtems/posix/shm.h
> +
> +$(PROJECT_INCLUDE)/rtems/posix/shmimpl.h: include/rtems/posix/shmimpl.h $(PROJECT_INCLUDE)/rtems/posix/$(dirstamp)
> +	$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/rtems/posix/shmimpl.h
> +PREINSTALL_FILES += $(PROJECT_INCLUDE)/rtems/posix/shmimpl.h
> +
>  $(PROJECT_INCLUDE)/rtems/posix/semaphore.h: include/rtems/posix/semaphore.h $(PROJECT_INCLUDE)/rtems/posix/$(dirstamp)
>  	$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/rtems/posix/semaphore.h
>  PREINSTALL_FILES += $(PROJECT_INCLUDE)/rtems/posix/semaphore.h
> diff --git a/cpukit/posix/src/shm.c b/cpukit/posix/src/shm.c
> new file mode 100644
> index 0000000..7dca6bb
> --- /dev/null
> +++ b/cpukit/posix/src/shm.c
> @@ -0,0 +1,48 @@
> +/**
> + * @file
> + */
> +
> +/*
> + * Copyright (c) 2016 Gedare Bloom.
> + *
> + * The license and distribution terms for this file may be
> + * found in the file LICENSE in this distribution or at
> + * http://www.rtems.org/license/LICENSE.
> + */
> +
> +#if HAVE_CONFIG_H
> +#include "config.h"
> +#endif
> +
> +#include <sys/stat.h>
> +#include <fcntl.h>
> +
> +#include <rtems/system.h>
> +#include <rtems/config.h>
> +#include <rtems/libio.h>
> +#include <rtems/sysinit.h>
> +#include <rtems/posix/shmimpl.h>
> +
> +Objects_Information _POSIX_Shm_Information;
> +
> +static void _POSIX_Shm_Manager_initialization( void )
> +{
> +  _Objects_Initialize_information(
> +    &_POSIX_Shm_Information,    /* object information table */
> +    OBJECTS_POSIX_API,          /* object API */
> +    OBJECTS_POSIX_SHMS,         /* object class */
> +    Configuration_POSIX_API.maximum_shms,
> +                                /* maximum objects of this class */
> +    sizeof( POSIX_Shm_Control ),
> +                                /* size of this object's control block */
> +    true,                       /* true if names for this object are strings */
> +    _POSIX_PATH_MAX,            /* maximum length of each object's name */
> +    NULL                        /* Proxy extraction support callout */
> +  );
> +}
> +
> +RTEMS_SYSINIT_ITEM(
> +  _POSIX_Shm_Manager_initialization,
> +  RTEMS_SYSINIT_POSIX_SHM,
> +  RTEMS_SYSINIT_ORDER_MIDDLE
> +);
> diff --git a/cpukit/posix/src/shmopen.c b/cpukit/posix/src/shmopen.c
> index abac3f4..bc4923f 100644
> --- a/cpukit/posix/src/shmopen.c
> +++ b/cpukit/posix/src/shmopen.c
> @@ -16,13 +16,202 @@
>
>  #include <sys/mman.h>
>  #include <errno.h>
> +#include <unistd.h>
> +#include <fcntl.h>
> +#include <sys/stat.h>
> +
> +#include <rtems/libio_.h>
>  #include <rtems/seterr.h>
>
> +#include <rtems/posix/shmimpl.h>
> +#include <rtems/score/wkspace.h>
> +
> +static const rtems_filesystem_file_handlers_r shm_handlers;
> +
> +static inline void shm_mtime_ctime_update( POSIX_Shm_Control *shm )
> +{
> +  struct timeval now;
> +
> +  gettimeofday( &now, 0 );
> +  shm->mtime = now.tv_sec;
> +  shm->ctime = now.tv_sec;
> +}
> +
> +static int shm_ftruncate( rtems_libio_t *iop, off_t length )
> +{
> +  Thread_queue_Context  queue_context;
> +  POSIX_Shm_Control *shm = (POSIX_Shm_Control *) iop->data1;
> +
> +  _POSIX_Shm_Acquire_critical( shm, &queue_context );
> +
> +  shm_mtime_ctime_update( shm );
> +
> +  _POSIX_Shm_Release( shm, &queue_context );
> +  return 0;
> +}
> +
> +static inline POSIX_Shm_Control *shm_allocate(
> +  const char *name_arg,
> +  size_t name_len,
> +  int oflag,
> +  mode_t mode,
> +  int *error
> +)
> +{
> +  POSIX_Shm_Control *shm;
> +  char *name;
> +  struct timeval tv;
> +
> +  name = _Workspace_String_duplicate( name_arg, name_len );
> +  if ( name == NULL ) {
> +    *error = ENOSPC;
> +    return NULL;
> +  }
> +
> +  shm = _POSIX_Shm_Allocate_unprotected();
> +  if ( shm == NULL ) {
> +    _Workspace_Free( name );
> +    *error = ENFILE;
> +    return NULL;
> +  }
> +
> +  gettimeofday( &tv, 0 );
> +
> +  shm->reference_count = 1;
> +  shm->shm_object = NULL;
> +  shm->shm_object_allocate = _Workspace_Allocate_or_fatal_error;
> +  shm->shm_object_free = _Workspace_Free;
> +  shm->shm_object_size = 0;
> +  shm->mode = mode & ~rtems_filesystem_umask;
> +  shm->uid = geteuid();
> +  shm->gid = getegid();
> +  shm->atime = (time_t) tv.tv_sec;
> +  shm->mtime = (time_t) tv.tv_sec;
> +  shm->ctime = (time_t) tv.tv_sec;
> +
> +  _Objects_Open_string( &_POSIX_Shm_Information, &shm->Object, name );
> +
> +  return shm;
> +}
> +
> +static inline bool shm_access_ok( POSIX_Shm_Control *shm, int oflag )
> +{
> +  int flags;
> +  if ( oflag & O_RDONLY ) {
> +    flags = RTEMS_FS_PERMS_READ;
> +  } else {
> +    flags = RTEMS_FS_PERMS_WRITE;
> +  }
> +  return rtems_filesystem_check_access( flags, shm->mode, shm->uid, shm->gid );
> +}
> +
>  int shm_open( const char *name, int oflag, mode_t mode )
>  {
> -  (void) name;
> -  (void) oflag;
> -  (void) mode;
> +  int err = 0;
> +  int fd;
> +  rtems_libio_t *iop;
> +  POSIX_Shm_Control *shm;
> +  size_t len;
> +  Objects_Get_by_name_error obj_err;
> +  Thread_queue_Context  queue_context;
> +
> +  if ( ( oflag & O_ACCMODE ) != O_RDONLY && ( oflag & O_ACCMODE ) != O_RDWR ) {
> +    rtems_set_errno_and_return_minus_one( EACCES );
> +  }
> +
> +  if ( ( oflag & ~( O_RDONLY | O_RDWR | O_CREAT | O_EXCL | O_TRUNC ) ) != 0 ) {
> +    rtems_set_errno_and_return_minus_one( EACCES );
> +  }
> +
> +  if ( ( oflag & O_TRUNC ) != 0 && ( oflag & O_ACCMODE ) != O_RDWR ) {
> +    rtems_set_errno_and_return_minus_one( EACCES );
> +  }
>
> -  rtems_set_errno_and_return_minus_one( EINVAL );
> +  /* TODO see if the object exists, shms available */
> +
> +  _Objects_Allocator_lock();
> +  shm = _POSIX_Shm_Get_by_name( name, &len, &obj_err );
> +
> +  if ( shm == NULL ) {
> +    switch ( obj_err ) {
> +      case OBJECTS_GET_BY_NAME_INVALID_NAME:
> +        err = EINVAL;
> +        break;
> +
> +      case OBJECTS_GET_BY_NAME_NAME_TOO_LONG:
> +        err = ENAMETOOLONG;
> +        break;
> +
> +      case OBJECTS_GET_BY_NAME_NO_OBJECT:
> +      default:
> +        /* Reject any name without a leading slash. */
> +        if ( name[0] != '/' ) {
> +          err = EINVAL;
> +          break;
> +        }
> +
> +        if ( ( oflag & O_CREAT ) != O_CREAT ) {
> +          err = ENOENT;
> +          break;
> +        }
> +
> +        shm = shm_allocate(name, len, oflag, mode, &err);
> +        break;
> +    }
> +    _Objects_Allocator_unlock();
> +    if ( err != 0 ) {
> +      rtems_set_errno_and_return_minus_one( err );
> +    }
> +  } else { /* shm exists */
> +    _Objects_Allocator_unlock();
> +    if ( ( oflag & ( O_EXCL | O_CREAT ) ) == ( O_EXCL | O_CREAT ) ) {

What happens to the allocated memory when there is an error?

> +      rtems_set_errno_and_return_minus_one( EEXIST );
> +    }
> +    if ( !shm_access_ok( shm, oflag ) ) {

Same here?

Chris

> +      rtems_set_errno_and_return_minus_one( EACCES );
> +    }
> +    _POSIX_Shm_Acquire_critical( shm, &queue_context );
> +    ++shm->reference_count;
> +    _POSIX_Shm_Release( shm, &queue_context );
> +  }
> +
> +  iop = rtems_libio_allocate();
> +  if ( iop == NULL ) {
> +    rtems_set_errno_and_return_minus_one( EMFILE );
> +  }
> +  if ( oflag & O_TRUNC ) {
> +      shm_ftruncate( iop, 0 );
> +  }
> +  fd = rtems_libio_iop_to_descriptor( iop );
> +  iop->flags |= LIBIO_FLAGS_CLOSE_ON_EXEC;
> +  if ( oflag & O_RDONLY ) {
> +    iop->flags |= LIBIO_FLAGS_READ;
> +  } else {
> +    iop->flags |= LIBIO_FLAGS_READ_WRITE;
> +  }
> +  iop->data0 = fd;
> +  iop->data1 = shm;
> +  iop->pathinfo.handlers = &shm_handlers;
> +  iop->pathinfo.mt_entry = &rtems_filesystem_null_mt_entry;
> +  rtems_filesystem_location_add_to_mt_entry( &iop->pathinfo );
> +
> +  return fd;
>  }
> +
> +static const rtems_filesystem_file_handlers_r shm_handlers = {
> +  .open_h = rtems_filesystem_default_open,
> +  .close_h = rtems_filesystem_default_close,
> +  .read_h = rtems_filesystem_default_read,
> +  .write_h = rtems_filesystem_default_write,
> +  .ioctl_h = rtems_filesystem_default_ioctl,
> +  .lseek_h = rtems_filesystem_default_lseek,
> +  .fstat_h = rtems_filesystem_default_fstat,
> +  .ftruncate_h = shm_ftruncate,
> +  .fsync_h = rtems_filesystem_default_fsync_or_fdatasync,
> +  .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync,
> +  .fcntl_h = rtems_filesystem_default_fcntl,
> +  .kqfilter_h = rtems_filesystem_default_kqfilter,
> +  .poll_h = rtems_filesystem_default_poll,
> +  .readv_h = rtems_filesystem_default_readv,
> +  .writev_h = rtems_filesystem_default_writev
> +};
> diff --git a/cpukit/rtems/src/rtemsobjectgetapiclassname.c b/cpukit/rtems/src/rtemsobjectgetapiclassname.c
> index dd92e6c..0923a89 100644
> --- a/cpukit/rtems/src/rtemsobjectgetapiclassname.c
> +++ b/cpukit/rtems/src/rtemsobjectgetapiclassname.c
> @@ -56,6 +56,7 @@ static const rtems_assoc_t rtems_object_api_posix_assoc[] = {
>    { "Barrier",                 OBJECTS_POSIX_BARRIERS, 0},
>    { "Spinlock",                OBJECTS_POSIX_SPINLOCKS, 0},
>    { "RWLock",                  OBJECTS_POSIX_RWLOCKS, 0},
> +  { "Shared Memory",           OBJECTS_POSIX_SHMS, 0},
>    { NULL,                      0, 0}
>  };
>  #endif
> diff --git a/cpukit/sapi/include/confdefs.h b/cpukit/sapi/include/confdefs.h
> index b75839e..385bf62 100644
> --- a/cpukit/sapi/include/confdefs.h
> +++ b/cpukit/sapi/include/confdefs.h
> @@ -2068,6 +2068,10 @@ extern rtems_initialization_tasks_table Initialization_tasks[];
>        #define CONFIGURE_MAXIMUM_POSIX_RWLOCKS \
>          rtems_resource_unlimited(CONFIGURE_UNLIMITED_ALLOCATION_SIZE)
>      #endif
> +    #if !defined(CONFIGURE_MAXIMUM_POSIX_SHMS)
> +      #define CONFIGURE_MAXIMUM_POSIX_SHMS \
> +        rtems_resource_unlimited(CONFIGURE_UNLIMITED_ALLOCATION_SIZE)
> +    #endif
>      #if !defined(CONFIGURE_MAXIMUM_POSIX_SPINLOCKS)
>        #define CONFIGURE_MAXIMUM_POSIX_SPINLOCKS \
>          rtems_resource_unlimited(CONFIGURE_UNLIMITED_ALLOCATION_SIZE)
> @@ -2468,6 +2472,7 @@ extern rtems_initialization_tasks_table Initialization_tasks[];
>    #include <rtems/posix/pthread.h>
>    #include <rtems/posix/rwlock.h>
>    #include <rtems/posix/semaphore.h>
> +  #include <rtems/posix/shm.h>
>    #include <rtems/posix/spinlock.h>
>    #include <rtems/posix/threadsup.h>
>    #include <rtems/posix/timer.h>
> @@ -2648,6 +2653,23 @@ extern rtems_initialization_tasks_table Initialization_tasks[];
>    #define CONFIGURE_MEMORY_FOR_POSIX_RWLOCKS(_rwlocks) \
>      _Configure_Object_RAM(_rwlocks, sizeof(POSIX_RWLock_Control) )
>
> +  /**
> +   * Configure the maximum number of POSIX shared memory objects.
> +   */
> +  #if !defined(CONFIGURE_MAXIMUM_POSIX_SHMS)
> +    #define CONFIGURE_MAXIMUM_POSIX_SHMS 0
> +  #endif
> +
> +  /**
> +   * This macro is calculated to specify the memory required for
> +   * POSIX API shared memory.
> +   *
> +   * This is an internal parameter.
> +   */
> +  #define CONFIGURE_MEMORY_FOR_POSIX_SHMS(_shms) \
> +    _Configure_Object_RAM(_shms, sizeof(POSIX_Shm_Control) )
> +
> +
>    #ifdef CONFIGURE_POSIX_INIT_THREAD_TABLE
>
>      #ifdef CONFIGURE_POSIX_HAS_OWN_INIT_THREAD_TABLE
> @@ -2875,6 +2897,8 @@ extern rtems_initialization_tasks_table Initialization_tasks[];
>          CONFIGURE_MAXIMUM_POSIX_SPINLOCKS) + \
>        CONFIGURE_MEMORY_FOR_POSIX_RWLOCKS( \
>          CONFIGURE_MAXIMUM_POSIX_RWLOCKS) + \
> +      CONFIGURE_MEMORY_FOR_POSIX_SHMS( \
> +        CONFIGURE_MAXIMUM_POSIX_SHMS) + \
>        CONFIGURE_MEMORY_FOR_POSIX_TIMERS(CONFIGURE_MAXIMUM_POSIX_TIMERS))
>  #else
>    /**
> @@ -3333,6 +3357,7 @@ extern rtems_initialization_tasks_table Initialization_tasks[];
>        CONFIGURE_MAXIMUM_POSIX_SEMAPHORES,
>        CONFIGURE_MAXIMUM_POSIX_BARRIERS,
>        CONFIGURE_MAXIMUM_POSIX_RWLOCKS,
> +      CONFIGURE_MAXIMUM_POSIX_SHMS,
>        CONFIGURE_MAXIMUM_POSIX_SPINLOCKS,
>        CONFIGURE_POSIX_INIT_THREAD_TABLE_SIZE,
>        CONFIGURE_POSIX_INIT_THREAD_TABLE_NAME
> @@ -3550,6 +3575,7 @@ extern rtems_initialization_tasks_table Initialization_tasks[];
>      uint32_t POSIX_BARRIERS;
>      uint32_t POSIX_SPINLOCKS;
>      uint32_t POSIX_RWLOCKS;
> +    uint32_t POSIX_SHMS;
>  #endif
>
>      /* Stack space sizes */
> @@ -3604,6 +3630,7 @@ extern rtems_initialization_tasks_table Initialization_tasks[];
>      CONFIGURE_MEMORY_FOR_POSIX_BARRIERS( CONFIGURE_MAXIMUM_POSIX_BARRIERS ),
>      CONFIGURE_MEMORY_FOR_POSIX_SPINLOCKS( CONFIGURE_MAXIMUM_POSIX_SPINLOCKS ),
>      CONFIGURE_MEMORY_FOR_POSIX_RWLOCKS( CONFIGURE_MAXIMUM_POSIX_RWLOCKS ),
> +    CONFIGURE_MEMORY_FOR_POSIX_SHMS( CONFIGURE_MAXIMUM_POSIX_SHMS ),
>      CONFIGURE_MEMORY_FOR_POSIX_TIMERS( CONFIGURE_MAXIMUM_POSIX_TIMERS ),
>  #endif
>
> @@ -3676,6 +3703,7 @@ extern rtems_initialization_tasks_table Initialization_tasks[];
>         (CONFIGURE_MAXIMUM_POSIX_BARRIERS != 0) || \
>         (CONFIGURE_MAXIMUM_POSIX_SPINLOCKS != 0) || \
>         (CONFIGURE_MAXIMUM_POSIX_RWLOCKS != 0) || \
> +       (CONFIGURE_MAXIMUM_POSIX_SHMS != 0) || \
>        defined(CONFIGURE_POSIX_INIT_THREAD_TABLE))
>    #error "CONFIGURATION ERROR: POSIX API support not configured!!"
>    #endif
> diff --git a/cpukit/score/include/rtems/score/objectimpl.h b/cpukit/score/include/rtems/score/objectimpl.h
> index f5beb3b..13dd291 100644
> --- a/cpukit/score/include/rtems/score/objectimpl.h
> +++ b/cpukit/score/include/rtems/score/objectimpl.h
> @@ -93,11 +93,12 @@ typedef enum {
>    OBJECTS_POSIX_TIMERS              = 9,
>    OBJECTS_POSIX_BARRIERS            = 10,
>    OBJECTS_POSIX_SPINLOCKS           = 11,
> -  OBJECTS_POSIX_RWLOCKS             = 12
> +  OBJECTS_POSIX_RWLOCKS             = 12,
> +  OBJECTS_POSIX_SHMS                = 13
>  } Objects_POSIX_API;
>
>  /** This macro is used to generically specify the last API index. */
> -#define OBJECTS_POSIX_CLASSES_LAST OBJECTS_POSIX_RWLOCKS
> +#define OBJECTS_POSIX_CLASSES_LAST OBJECTS_POSIX_SHMS
>
>  /*
>   * For fake objects, which have an object identifier, but no objects
> diff --git a/cpukit/score/include/rtems/sysinit.h b/cpukit/score/include/rtems/sysinit.h
> index ad68c45..6a97d78 100644
> --- a/cpukit/score/include/rtems/sysinit.h
> +++ b/cpukit/score/include/rtems/sysinit.h
> @@ -57,6 +57,7 @@ extern "C" {
>  #define RTEMS_SYSINIT_POSIX_SPINLOCK             000369
>  #define RTEMS_SYSINIT_POSIX_CLEANUP              00036a
>  #define RTEMS_SYSINIT_POSIX_KEYS                 00036b
> +#define RTEMS_SYSINIT_POSIX_SHM                  00036c
>  #define RTEMS_SYSINIT_IDLE_THREADS               000380
>  #define RTEMS_SYSINIT_LIBIO                      000400
>  #define RTEMS_SYSINIT_ROOT_FILESYSTEM            000401
> diff --git a/testsuites/psxtests/psxshm01/system.h b/testsuites/psxtests/psxshm01/system.h
> index 9a55a8a..1dde70e 100644
> --- a/testsuites/psxtests/psxshm01/system.h
> +++ b/testsuites/psxtests/psxshm01/system.h
> @@ -21,7 +21,7 @@ void *POSIX_Init(
>
>  #define CONFIGURE_MAXIMUM_POSIX_THREADS     1
>  #define CONFIGURE_LIBIO_MAXIMUM_FILE_DESCRIPTORS 10
> -#define CONFIGURE_MAXIMUM_SHMEMS 1
> +#define CONFIGURE_MAXIMUM_POSIX_SHMS 1
>
>  #define CONFIGURE_POSIX_INIT_THREAD_TABLE
>
> diff --git a/testsuites/sptests/spsysinit01/init.c b/testsuites/sptests/spsysinit01/init.c
> index 1ce22d5..3f36842 100644
> --- a/testsuites/sptests/spsysinit01/init.c
> +++ b/testsuites/sptests/spsysinit01/init.c
> @@ -43,6 +43,7 @@
>  #include <rtems/posix/pthreadimpl.h>
>  #include <rtems/posix/rwlockimpl.h>
>  #include <rtems/posix/semaphoreimpl.h>
> +#include <rtems/posix/shmimpl.h>
>  #include <rtems/posix/spinlockimpl.h>
>  #include <rtems/posix/timerimpl.h>
>  #endif /* RTEMS_POSIX_API */
> @@ -118,6 +119,8 @@ typedef enum {
>    POSIX_BARRIER_POST,
>    POSIX_RWLOCK_PRE,
>    POSIX_RWLOCK_POST,
> +  POSIX_SHM_PRE,
> +  POSIX_SHM_POST,
>    POSIX_SPINLOCK_PRE,
>    POSIX_SPINLOCK_POST,
>    POSIX_CLEANUP_PRE,
> @@ -527,6 +530,18 @@ LAST(RTEMS_SYSINIT_POSIX_RWLOCK)
>    next_step(POSIX_RWLOCK_POST);
>  }
>
> +FIRST(RTEMS_SYSINIT_POSIX_SHM)
> +{
> +  assert(_POSIX_Shm_Information.maximum == 0);
> +  next_step(POSIX_SHM_PRE);
> +}
> +
> +LAST(RTEMS_SYSINIT_POSIX_SHM)
> +{
> +  assert(_POSIX_Shm_Information.maximum != 0);
> +  next_step(POSIX_SHM_POST);
> +}
> +
>  FIRST(RTEMS_SYSINIT_POSIX_SPINLOCK)
>  {
>    assert(_POSIX_Spinlock_Information.maximum == 0);
> @@ -767,6 +782,8 @@ static void *POSIX_Init(void *arg)
>
>  #define CONFIGURE_MAXIMUM_POSIX_SEMAPHORES 1
>
> +#define CONFIGURE_MAXIMUM_POSIX_SHMS 1
> +
>  #define CONFIGURE_MAXIMUM_POSIX_SPINLOCKS 1
>
>  #define CONFIGURE_MAXIMUM_POSIX_TIMERS 1
>



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