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fix bitmap allocation

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This commit is contained in:
Danila Shtan
2014-02-12 15:37:44 +05:00
parent 79ca1940de
commit 2c6855a969
1 changed files with 13 additions and 5 deletions
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core/cache.c
+13 -5
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@@ -104,19 +104,27 @@ static uint64_t cache_mark_blocks(struct uwsgi_cache *uc, uint64_t index, uint64
uint64_t first_byte = index/8;
uint8_t first_byte_bit = index % 8;
uint64_t last_byte = (index+needed_blocks)/8;
uint8_t last_byte_bit = (index+needed_blocks) % 8;
// offset starts with 0, so actial last byte is index + needed_blocks - 1
uint64_t last_byte = (index + needed_blocks - 1) / 8;
uint8_t last_byte_bit = (index + needed_blocks - 1) % 8;
uint64_t needed_bytes = (last_byte - first_byte) + 1;
//uwsgi_log("%llu %u %llu %u\n", first_byte, first_byte_bit, last_byte, last_byte_bit);
uint8_t mask = 0xff >> first_byte_bit;
if (needed_bytes == 1) {
// kinda hacky, but it does the job
mask >>= (8 - last_byte_bit);
mask <<= (8 - last_byte_bit);
}
uc->blocks_bitmap[first_byte] |= mask;
uint64_t needed_bytes = (last_byte - first_byte)+1;
if (needed_bytes > 1) {
mask = 0xff << (8 - last_byte_bit);
uc->blocks_bitmap[last_byte-1] |= mask;
uc->blocks_bitmap[last_byte] |= mask;
}
if (needed_bytes > 2) {