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author | px4dev <px4@purgatory.org> | 2012-08-04 15:12:36 -0700 |
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committer | px4dev <px4@purgatory.org> | 2012-08-04 15:12:36 -0700 |
commit | 8a365179eafdf3aea98e60ab9f5882b200d4c759 (patch) | |
tree | 4f38d6d4cd80bd0b6e22e2bb534c3f117ce44e56 /nuttx/sched/sem_internal.h | |
download | px4-firmware-8a365179eafdf3aea98e60ab9f5882b200d4c759.tar.gz px4-firmware-8a365179eafdf3aea98e60ab9f5882b200d4c759.tar.bz2 px4-firmware-8a365179eafdf3aea98e60ab9f5882b200d4c759.zip |
Fresh import of the PX4 firmware sources.
Diffstat (limited to 'nuttx/sched/sem_internal.h')
-rw-r--r-- | nuttx/sched/sem_internal.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/nuttx/sched/sem_internal.h b/nuttx/sched/sem_internal.h new file mode 100644 index 000000000..434c551a4 --- /dev/null +++ b/nuttx/sched/sem_internal.h @@ -0,0 +1,131 @@ +/**************************************************************************** + * sched/sem_internal.h + * + * Copyright (C) 2007, 2009-2012 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. + * + ****************************************************************************/ + +#ifndef __SCHED_SEM_INTERNAL_H +#define __SCHED_SEM_INTERNAL_H + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> +#include <nuttx/compiler.h> + +#include <stdint.h> +#include <stdbool.h> +#include <semaphore.h> +#include <sched.h> +#include <queue.h> + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Public Type Declarations + ****************************************************************************/ + +/* This is the named semaphore structure */ + +struct nsem_s +{ + FAR struct nsem_s *flink; /* Forward link */ + FAR struct nsem_s *blink; /* Backward link */ + uint16_t nconnect; /* Number of connections to semaphore */ + FAR char *name; /* Semaphore name (NULL if un-named) */ + bool unlinked; /* true if the semaphore has been unlinked */ + sem_t sem; /* The semaphore itself */ +}; + +typedef struct nsem_s nsem_t; + +/**************************************************************************** + * Public Variables + ****************************************************************************/ + +/* This is a list of dyanamically allocated named semaphores */ + +extern dq_queue_t g_nsems; + +/**************************************************************************** + * Public Function Prototypes + ****************************************************************************/ + +#ifdef __cplusplus +#define EXTERN extern "C" +extern "C" { +#else +#define EXTERN extern +#endif + +/* Common semaphore logic */ + +EXTERN void weak_function sem_initialize(void); +EXTERN void sem_waitirq(FAR _TCB *wtcb, int errcode); +EXTERN FAR nsem_t *sem_findnamed(const char *name); + +/* Special logic needed only by priority inheritance to manage collections of + * holders of semaphores. + */ + +#ifdef CONFIG_PRIORITY_INHERITANCE +EXTERN void sem_initholders(void); +EXTERN void sem_destroyholder(FAR sem_t *sem); +EXTERN void sem_addholder(FAR sem_t *sem); +EXTERN void sem_boostpriority(FAR sem_t *sem); +EXTERN void sem_releaseholder(FAR sem_t *sem); +EXTERN void sem_restorebaseprio(FAR _TCB *stcb, FAR sem_t *sem); +# ifndef CONFIG_DISABLE_SIGNALS +EXTERN void sem_canceled(FAR _TCB *stcb, FAR sem_t *sem); +# else +# define sem_canceled(stcb, sem) +# endif +#else +# define sem_initholders() +# define sem_destroyholder(sem) +# define sem_addholder(sem) +# define sem_boostpriority(sem) +# define sem_releaseholder(sem) +# define sem_restorebaseprio(stcb,sem) +# define sem_canceled(stcb, sem) +#endif + +#undef EXTERN +#ifdef __cplusplus +} +#endif + +#endif /* __SCHED_SEM_INTERNAL_H */ + |