| 1 | /*
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| 2 | * Copyright (c) 2015 Michal Koutny
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #ifndef SYSMAN_DEP_H
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| 30 | #define SYSMAN_DEP_H
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| 31 |
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| 32 | #include <adt/list.h>
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| 33 |
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| 34 | #include "unit.h"
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| 35 |
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| 36 | typedef enum {
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| 37 | DEP_EMBRYO,
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| 38 | DEP_VALID
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| 39 | } dependency_state_t;
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| 40 |
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| 41 | /** Dependency edge between unit in dependency graph
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| 42 | *
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| 43 | * @code
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| 44 | * dependant ---> dependency
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| 45 | * @endcode
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| 46 | *
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| 47 | */
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| 48 | typedef struct {
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| 49 | /** Link to dependants list */
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| 50 | link_t dependants;
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| 51 | /** Link to dependencies list */
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| 52 | link_t dependencies;
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| 53 |
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| 54 | dependency_state_t state;
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| 55 |
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| 56 | /** Unit that depends on another */
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| 57 | unit_t *dependant;
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| 58 |
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| 59 | /** Unit that is dependency for another */
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| 60 | unit_t *dependency;
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| 61 |
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| 62 | /** Name of the dependency unit, for resolved dependencies it's NULL
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| 63 | *
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| 64 | * @note Either dependency or dependency_name is set. Never both nor
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| 65 | * none.
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| 66 | */
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| 67 | char *dependency_name;
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| 68 | } unit_dependency_t;
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| 69 |
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| 70 | extern unit_dependency_t *dep_dependency_create(void);
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| 71 | extern void dep_dependency_destroy(unit_dependency_t **);
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| 72 |
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| 73 | extern int dep_sprout_dependency(unit_t *, const char *);
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| 74 | extern void dep_resolve_dependency(unit_dependency_t *, unit_t *);
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| 75 |
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| 76 | extern int dep_add_dependency(unit_t *, unit_t *);
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| 77 | extern void dep_remove_dependency(unit_dependency_t **);
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| 78 |
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| 79 |
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| 80 | #endif
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| 81 |
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| 82 |
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