From e3940eb2080711edac189cca3f642ee89dc215f2 Mon Sep 17 00:00:00 2001 From: patacongo Date: Sat, 17 Feb 2007 23:21:28 +0000 Subject: NuttX RTOS git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3 --- nuttx/include/semaphore.h | 103 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 103 insertions(+) create mode 100644 nuttx/include/semaphore.h (limited to 'nuttx/include/semaphore.h') diff --git a/nuttx/include/semaphore.h b/nuttx/include/semaphore.h new file mode 100644 index 000000000..92ac7ab89 --- /dev/null +++ b/nuttx/include/semaphore.h @@ -0,0 +1,103 @@ +/************************************************************ + * semaphore.h + * + * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt + * + * 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 Gregory Nutt 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. + * + ************************************************************/ + +#ifndef __SEMAPHORE_H +#define __SEMAPHORE_H + +/************************************************************ + * Included Files + ************************************************************/ + +#include + +#ifdef __cplusplus +#define EXTERN extern "C" +extern "C" { +#else +#define EXTERN extern +#endif + +/************************************************************ + * Definitions + ************************************************************/ + +/* The maximum value that a semaphore may have. */ + +#define SEM_MAX_VALUE 0x7fff /* Max value POSIX counting semaphore */ + +/* The maximum number of semaphores that a task may have */ + +#define SEM_NSEMS_MAX 0x7fffffff + +/************************************************************ + * Public Type Declarations + ************************************************************/ + +/* This is the generic semaphore structure. */ + +struct sem_s +{ + sint16 semcount; /* >0 -> Num counts available */ + /* <0 -> Num tasks waiting for semaphore */ +}; +typedef struct sem_s sem_t; + +/************************************************************ + * Public Variables + ************************************************************/ + +/************************************************************ + * Public Function Prototypes + ************************************************************/ + +/* Counting Semaphore Interfaces (based on POSIX APIs) */ + +EXTERN int sem_init(sem_t *sem, int pshared, unsigned int value); +EXTERN int sem_destroy(sem_t *sem); +EXTERN sem_t *sem_open(const char *name, int oflag, ...); +EXTERN int sem_close(sem_t *sem); +EXTERN int sem_unlink(const char *name); +EXTERN int sem_wait(sem_t *sem); +EXTERN int sem_trywait(sem_t *sem); +EXTERN int sem_post(sem_t *sem); +EXTERN int sem_getvalue(sem_t *sem, int *sval); + +#undef EXTERN +#ifdef __cplusplus +} +#endif + +#endif /* __SEMAPHORE_H */ + -- cgit v1.2.3