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RB: use sem_getvalue as a tie breaker when read_pt == write_pt

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Signed-off-by: Angus Salkeld <asalkeld@redhat.com>
This commit is contained in:
Angus Salkeld 2012-07-17 12:19:16 +10:00
parent bdc63cdf1a
commit 6e1d9054c3
1 changed files with 5 additions and 1 deletions
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6
lib/ringbuffer.c
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@ -346,7 +346,11 @@ qb_rb_space_free(struct qb_ringbuffer_s * rb)
} else if (write_size < read_size) {
space_free = (read_size - write_size) - 1;
} else {
space_free = rb->shared_hdr->word_size;
if (rb->sem_getvalue_fn && rb->sem_getvalue_fn(rb) > 0) {
space_free = 0;
} else {
space_free = rb->shared_hdr->word_size;
}
}
/* word -> bytes */