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author | Gregory Nutt <gnutt@nuttx.org> | 2014-09-23 08:46:31 -0600 |
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committer | Gregory Nutt <gnutt@nuttx.org> | 2014-09-23 08:46:31 -0600 |
commit | 0ab7598b044d6520db91211abe62a75c51a9ea81 (patch) | |
tree | a3f5ab01f1b662b2be927c02fe64a139d6fcf380 /nuttx/mm/shm/shm_initialize.c | |
parent | 0f3f2d5095043776fc32c2f802bbbf2ed3865533 (diff) | |
download | nuttx-0ab7598b044d6520db91211abe62a75c51a9ea81.tar.gz nuttx-0ab7598b044d6520db91211abe62a75c51a9ea81.tar.bz2 nuttx-0ab7598b044d6520db91211abe62a75c51a9ea81.zip |
Add shared memory initializatin logic
Diffstat (limited to 'nuttx/mm/shm/shm_initialize.c')
-rwxr-xr-x | nuttx/mm/shm/shm_initialize.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/nuttx/mm/shm/shm_initialize.c b/nuttx/mm/shm/shm_initialize.c new file mode 100755 index 000000000..1da2d4e2e --- /dev/null +++ b/nuttx/mm/shm/shm_initialize.c @@ -0,0 +1,111 @@ +/**************************************************************************** + * mm/shm/shm_initialize.c + * + * Copyright (C) 2014 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include "shm/shm.h" + +#ifdef CONFIG_MM_SHM + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/* State of the all shared memory */ + +struct shm_info_s g_shminfo; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: shm_initialize + * + * Description: + * Perform one time, start-up initialization of the shared memor logic. + * + * Input Parameters: + * None + * + * Returned Value: + * None + * + ****************************************************************************/ + +void shm_initialize(void) +{ +#if SHM_INVALID_KEY != 0 + FAR struct shm_region_s *region; + int i; +#endif + + /* Initialize the shared memory region list */ + + sem_init(&g_shminfo.si_sem, 0, 1); + +#if SHM_INVALID_KEY != 0 + /* Initialize each shared memory region */ + + for (i = 0; i < CONFIG_ARCH_SHM_NPAGES; i++) + { + region = &g_shminfo.si_region[i]; + + /* Markk the key invalid for each region. The invalid key is an + * indication that the region is not in use. + */ + + region->sr_key = SHM_INVALID_KEY; + } +#endif +} + +#endif /* CONFIG_MM_SHM */ |