NuttX RTOS

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 103 insertions, 0 deletions

diff --git a/nuttx/include/semaphore.h b/nuttx/include/semaphore.h
new file mode 100644
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+/************************************************************
+ * semaphore.h
+ *
+ *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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 <sys/types.h>
+
+#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 */
+