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3 * Copyright 2003-2010 Novell, Inc.
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24 #define GRAY_QUEUE_LENGTH_LIMIT 64
26 static GrayQueue gray_queue;
29 gray_object_alloc_queue_section (GrayQueue *queue)
31 GrayQueueSection *section;
33 if (queue->free_list) {
34 /* Use the previously allocated queue sections if possible */
35 section = queue->free_list;
36 queue->free_list = section->next;
38 /* Allocate a new section */
39 section = mono_sgen_alloc_internal (INTERNAL_MEM_GRAY_QUEUE);
44 /* Link it with the others */
45 section->next = queue->first;
46 queue->first = section;
50 gray_object_free_queue_section (GrayQueueSection *section)
52 mono_sgen_free_internal (section, INTERNAL_MEM_GRAY_QUEUE);
55 static inline gboolean
56 gray_object_queue_is_empty (GrayQueue *queue)
58 return queue->first == NULL;
62 * The following two functions are called in the inner loops of the
63 * collector, so they need to be as fast as possible. We have macros
64 * for them in sgen-gc.h.
68 mono_sgen_gray_object_enqueue (GrayQueue *queue, char *obj)
70 DEBUG (9, g_assert (obj));
71 if (G_UNLIKELY (!queue->first || queue->first->end == SGEN_GRAY_QUEUE_SECTION_SIZE))
72 gray_object_alloc_queue_section (queue);
73 DEBUG (9, g_assert (queue->first && queue->first->end < SGEN_GRAY_QUEUE_SECTION_SIZE));
74 queue->first->objects [queue->first->end++] = obj;
76 DEBUG (9, ++queue->balance);
80 mono_sgen_gray_object_dequeue (GrayQueue *queue)
84 if (gray_object_queue_is_empty (queue))
87 DEBUG (9, g_assert (queue->first->end));
89 obj = queue->first->objects [--queue->first->end];
91 if (G_UNLIKELY (queue->first->end == 0)) {
92 GrayQueueSection *section = queue->first;
93 queue->first = section->next;
94 section->next = queue->free_list;
95 queue->free_list = section;
98 DEBUG (9, --queue->balance);
104 gray_object_queue_init (GrayQueue *queue)
106 GrayQueueSection *section, *next;
109 g_assert (gray_object_queue_is_empty (queue));
110 DEBUG (9, g_assert (queue->balance == 0));
112 /* Free the extra sections allocated during the last collection */
114 for (section = queue->free_list; section && i < GRAY_QUEUE_LENGTH_LIMIT - 1; section = section->next)
118 while (section->next) {
119 next = section->next;
120 section->next = next->next;
121 gray_object_free_queue_section (next);