/*
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* Copyright (c) 2014, Linaro Limited
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef HANDLE_H
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#define HANDLE_H
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#include <stdint.h>
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#include <pthread.h>
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struct handle_db {
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void **ptrs;
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size_t max_ptrs;
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pthread_mutex_t *mu;
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};
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#define HANDLE_DB_INITIALIZER { NULL, 0, NULL }
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#define HANDLE_DB_INITIALIZER_WITH_MUTEX(mu) { NULL, 0, (mu) }
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/*
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* Assigns a mutex for the database. If mu != NULL the mutex will be
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* acquired before each access to the database and released when
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* the operation is done.
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*/
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void handle_db_set_mutex(struct handle_db *db, pthread_mutex_t *mu);
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/*
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* Frees all internal data structures of the database, but does not free
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* the db pointer. The database is safe to reuse after it's destroyed, it
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* just be empty again. The assigned mutex is also preserved.
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*/
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void handle_db_destroy(struct handle_db *db);
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/*
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* Allocates a new handle and assigns the supplied pointer to it,
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* ptr must not be NULL.
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* The function returns
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* >= 0 on success and
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* -1 on failure
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*/
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int handle_get(struct handle_db *db, void *ptr);
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/*
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* Deallocates a handle. Returns the assiciated pointer of the handle
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* the the handle was valid or NULL if it's invalid.
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*/
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void *handle_put(struct handle_db *db, int handle);
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/*
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* Returns the assiciated pointer of the handle if the handle is a valid
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* handle.
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* Returns NULL on failure.
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*/
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void *handle_lookup(struct handle_db *db, int handle);
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void handle_foreach_put(struct handle_db *db,
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void (*cb)(int handle, void *ptr, void *arg),
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void *arg);
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#endif /*HANDLE_H*/
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