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Add a simple named semaphore test to the OS test

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Gregory Nutt 2014-09-28 13:02:36 -06:00
parent 8a6a202c6d
commit aed3fe045e
2 changed files with 32 additions and 21 deletions
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40
include/nuttx/fs/fs.h
View file

@ -1,7 +1,7 @@
/****************************************************************************
* include/nuttx/fs/fs.h
*
* Copyright (C) 2007-2009, 2011-2014 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2009, 2011-2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@ -48,7 +48,9 @@
#include <stdbool.h>
#include <semaphore.h>
#include <nuttx/semaphore.h>
#ifdef CONFIG_FS_NAMED_SEMAPHORES
# include <nuttx/semaphore.h>
#endif
/****************************************************************************
* Pre-processor Definitions
@ -203,28 +205,25 @@ struct mountpt_operations
/* Named OS resources are also maintained by the VFS. This includes:
*
* - Named semaphores: sem_open(), sem_close(), and sem_unlink()
* - POSIX Message Queues: mq_open(), mq_close(), and mq_unlink()
* - POSIX Message Queues: mq_open() and mq_close()
* - Shared memory: shm_open() and shm_unlink();
*
* These are a special case in that they do not follow the same pattern
* as the other inode system types:
* These are a special case in that they do not follow quite the same
* pattern as the other file system types in that they have no read or
* write methods.
*
* - All of these resources have their own open() and unlink() interfaces.
* All require special, additional operations at open() and unlink()
* time
* - None of the standard VFS operations can be used with semaphores
* or named messages queues. These OS resources have their own
* own open() and close methods that do not use file descriptors.
* - Only ftruncate() and close() make sense with the file descriptor
* returned by shm_open()
*
* Inode types are not defined here, but rather in:
*
* - include/nuttx/semaphore.h
* - include/nuttx/mqueue.h, and
* - include/nuttx/shm.h
* Each inode type carries a payload specific to the OS resource;
* Only the contents of struct special_operations is visible to the VFS.
*/
struct inode;
struct special_operations
{
int (*open)(FAR struct inode *inode);
int (*close)(FAR struct inode *inode);
int (*unlink)(FAR struct inode *inode, FAR const char *relpath);
};
/* These are the various kinds of operations that can be associated with
* an inode.
*/
@ -236,7 +235,10 @@ union inode_ops_u
FAR const struct block_operations *i_bops; /* Block driver operations */
FAR const struct mountpt_operations *i_mops; /* Operations on a mountpoint */
#endif
FAR const struct special_operations *i_xops; /* Generic operations on OS resources */
#ifdef CONFIG_FS_NAMED_SEMAPHORES
FAR const struct semaphore_operations *i_sops; /* Operations for named semaphores */
#endif
};
/* This structure represents one inode in the Nuttx pseudo-file system */

13
include/nuttx/semaphore.h
View file

@ -54,15 +54,24 @@
* Public Data
****************************************************************************/
#ifdef CONFIG_FS_NAMED_SEMAPHORES
/* This is the named semaphore inode */
struct inode; /* Forward reference */
struct semaphore_operations
{
/* Common inode operations */
int (*open)(FAR struct inode *inode);
int (*close)(FAR struct inode *inode);
int (*unlink)(FAR struct inode *inode, FAR const char *relpath);
/* Payload unique to named semaphores */
uint16_t ns_refs; /* Number of open references to the semaphore */
sem_t ns_sem; /* The semaphore itself */
uint16_t ns_refs; /* Number of open references semaphore */
sem_t ns_sem; /* The semaphore itself */
};
#endif
/****************************************************************************
* Public Data