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50 lines
951 B
C
50 lines
951 B
C
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#include "deathqueue.h"
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Block *death_queue_head = NULL, *death_queue_tail = NULL;
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/* Appends a block to the end of the doubly-linked death queue. */
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void
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death_queue_enqueue (Block *b)
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{
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b->death_queue_prev = death_queue_tail;
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b->death_queue_next = NULL;
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if (death_queue_tail == NULL)
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death_queue_head = b;
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else
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death_queue_tail->death_queue_next = b;
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death_queue_tail = b;
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}
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/* Removes a block from the end of the doubly-linked death queue. */
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void
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death_queue_dequeue (Block *b)
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{
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Block *p, *n;
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p = b->death_queue_prev;
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n = b->death_queue_next;
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if (p == NULL)
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{
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if (death_queue_head == b) /* Verify this just to be safe. */
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death_queue_head = n;
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}
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else
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p->death_queue_next = n;
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if (n == NULL)
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{
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if (death_queue_tail == b) /* Verify this just to be safe. */
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death_queue_tail = p;
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}
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else
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n->death_queue_prev = p;
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b->death_queue_prev = b->death_queue_next = NULL;
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}
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