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1 | /* hooks.c */ | |
2 | ||
3 | #include "hooks.h" | |
4 | #include <assert.h> | |
5 | #include "../core/error.h" | |
6 | #include <stdlib.h> | |
7 | #include <stdio.h> | |
8 | #include <string.h> | |
9 | ||
10 | #define HF_CONTIGUOUS 0x01 | |
11 | ||
12 | typedef struct Hook { | |
13 | HookCallback callback; | |
14 | long priority; | |
15 | short flags; | |
16 | struct Hook *next; | |
17 | } Hook; | |
18 | ||
19 | typedef struct HookHead { | |
20 | int dirty; | |
21 | Hook *head; | |
22 | } HookHead; | |
23 | ||
24 | static HookHead hooks[HOOKMAX]; | |
25 | static int dirtyhooks[HOOKMAX]; | |
26 | static int dirtyhookcount; | |
27 | ||
28 | unsigned int hookqueuelength = 0; | |
29 | ||
30 | static void collectgarbage(HookHead *h); | |
31 | static void markdirty(int hook); | |
32 | ||
33 | void inithooks() { | |
34 | } | |
35 | ||
36 | int registerhook(int hooknum, HookCallback callback) { | |
37 | return registerpriorityhook(hooknum, callback, PRIORITY_DEFAULT); | |
38 | } | |
39 | ||
40 | int registerpriorityhook(int hooknum, HookCallback callback, long priority) { | |
41 | Hook *hp, *pred, *n; | |
42 | HookHead *h; | |
43 | ||
44 | if(hooknum>HOOKMAX) | |
45 | return 1; | |
46 | ||
47 | if(hookqueuelength > 0) | |
48 | Error("core", ERR_WARNING, "Attempting to register hook %d inside a hook queue: %p", hooknum, callback); | |
49 | ||
50 | for(pred=NULL,h=&hooks[hooknum],hp=h->head;hp;hp=hp->next) { | |
51 | if(hp->callback==callback) | |
52 | return 1; | |
53 | if(priority>=hp->priority) | |
54 | pred=hp; | |
55 | } | |
56 | ||
57 | n = malloc(sizeof(Hook)); | |
58 | n->priority = priority; | |
59 | n->callback = callback; | |
60 | n->flags = 0; | |
61 | ||
62 | if(!pred) { | |
63 | n->next = h->head; | |
64 | h->head = n; | |
65 | } else { | |
66 | n->next = pred->next; | |
67 | pred->next = n; | |
68 | } | |
69 | ||
70 | return 0; | |
71 | } | |
72 | ||
73 | int deregisterhook(int hooknum, HookCallback callback) { | |
74 | Hook *hp; | |
75 | HookHead *h; | |
76 | ||
77 | if (hooknum>HOOKMAX) | |
78 | return 1; | |
79 | ||
80 | if(hookqueuelength > 0) | |
81 | Error("core", ERR_WARNING, "Attempting to deregister hook %d inside a hook queue: %p", hooknum, callback); | |
82 | ||
83 | for(h=&hooks[hooknum],hp=h->head;hp;hp=hp->next) { | |
84 | if(hp->callback==callback) { | |
85 | markdirty(hooknum); | |
86 | hp->callback = NULL; | |
87 | return 0; | |
88 | } | |
89 | } | |
90 | ||
91 | return 1; | |
92 | } | |
93 | ||
94 | void triggerhook(int hooknum, void *arg) { | |
95 | int i; | |
96 | Hook *hp; | |
97 | ||
98 | if (hooknum>HOOKMAX) | |
99 | return; | |
100 | ||
101 | hookqueuelength++; | |
102 | for(hp=hooks[hooknum].head;hp;hp=hp->next) { | |
103 | if(hp->callback) | |
104 | (hp->callback)(hooknum, arg); | |
105 | } | |
106 | hookqueuelength--; | |
107 | ||
108 | if (!hookqueuelength && hooknum!=HOOK_CORE_ENDOFHOOKSQUEUE) { | |
109 | triggerhook(HOOK_CORE_ENDOFHOOKSQUEUE, 0); | |
110 | ||
111 | for(i=0;i<dirtyhookcount;i++) { | |
112 | collectgarbage(&hooks[dirtyhooks[i]]); | |
113 | } | |
114 | dirtyhookcount=0; | |
115 | } | |
116 | } | |
117 | ||
118 | static void markdirty(int hook) { | |
119 | if(hooks[hook].dirty) | |
120 | return; | |
121 | ||
122 | hooks[hook].dirty = 1; | |
123 | dirtyhooks[dirtyhookcount++] = hook; | |
124 | } | |
125 | ||
126 | static void collectgarbage(HookHead *h) { | |
127 | Hook *hp, *pp, *np; | |
128 | ||
129 | for(pp=NULL,hp=h->head;hp;hp=np) { | |
130 | np=hp->next; | |
131 | if(hp->callback==NULL) { | |
132 | free(hp); | |
133 | } else { | |
134 | if(pp==NULL) { | |
135 | h->head = hp; | |
136 | } else { | |
137 | pp->next = hp; | |
138 | } | |
139 | pp = hp; | |
140 | } | |
141 | } | |
142 | if(!pp) { | |
143 | h->head = NULL; | |
144 | } else { | |
145 | pp->next = NULL; | |
146 | } | |
147 | ||
148 | h->dirty = 0; | |
149 | } |