ringbuf: get_{write,read}_vector returns total bytes in both vec elts

This will eliminate unnecessary calls to ringbuf_{read,write}_space

git-svn-id: https://svn.musicpd.org/mpd/trunk@7389 09075e82-0dd4-0310-85a5-a0d7c8717e4f
This commit is contained in:
Eric Wong 2008-06-30 02:42:55 +00:00
parent aa828c1b25
commit 9873e07c5a
2 changed files with 9 additions and 5 deletions

View File

@ -224,7 +224,7 @@ void ringbuf_write_advance(struct ringbuf * rb, size_t cnt)
* the readable data is in one segment the second segment has zero
* length.
*/
void ringbuf_get_read_vector(const struct ringbuf * rb, struct iovec * vec)
size_t ringbuf_get_read_vector(const struct ringbuf * rb, struct iovec * vec)
{
size_t free_cnt;
size_t cnt2;
@ -247,13 +247,13 @@ void ringbuf_get_read_vector(const struct ringbuf * rb, struct iovec * vec)
vec[0].iov_len = rb->size - r;
vec[1].iov_base = rb->buf;
vec[1].iov_len = cnt2 & rb->size_mask;
} else {
/* Single part vector: just the rest of the buffer */
vec[0].iov_base = rb->buf + r;
vec[0].iov_len = free_cnt;
vec[1].iov_len = 0;
}
return vec[0].iov_len + vec[1].iov_len;
}
/*
@ -262,7 +262,7 @@ void ringbuf_get_read_vector(const struct ringbuf * rb, struct iovec * vec)
* the writeable data is in one segment the second segment has zero
* length.
*/
void ringbuf_get_write_vector(const struct ringbuf * rb, struct iovec * vec)
size_t ringbuf_get_write_vector(const struct ringbuf * rb, struct iovec * vec)
{
size_t free_cnt;
size_t cnt2;
@ -292,5 +292,6 @@ void ringbuf_get_write_vector(const struct ringbuf * rb, struct iovec * vec)
vec[0].iov_len = free_cnt;
vec[1].iov_len = 0;
}
return vec[0].iov_len + vec[1].iov_len;
}

View File

@ -85,8 +85,9 @@ void ringbuf_free(struct ringbuf * rb);
* @param rb a pointer to the ringbuffer structure.
* @param vec a pointer to a 2 element array of struct iovec.
*
* @return total number of bytes readable into both vec elements
*/
void ringbuf_get_read_vector(const struct ringbuf * rb, struct iovec * vec);
size_t ringbuf_get_read_vector(const struct ringbuf * rb, struct iovec * vec);
/**
* Fill a data structure with a description of the current writable
@ -106,8 +107,10 @@ void ringbuf_get_read_vector(const struct ringbuf * rb, struct iovec * vec);
*
* @param rb a pointer to the ringbuffer structure.
* @param vec a pointer to a 2 element array of struct iovec.
*
* @return total number of bytes writable in both vec elements
*/
void ringbuf_get_write_vector(const struct ringbuf * rb, struct iovec * vec);
size_t ringbuf_get_write_vector(const struct ringbuf * rb, struct iovec * vec);
/**
* Read data from the ringbuffer.