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authorEric Wong <normalperson@yhbt.net>2008-06-30 02:42:59 +0000
committerEric Wong <normalperson@yhbt.net>2008-06-30 02:42:59 +0000
commitc5931529675a863e7173635c5f8779f78b3940e2 (patch)
treebb0b75a9d6cda24d607958c706d1e02b380e2dae /src
parent9873e07c5abf787d7805b4266a243e56240354dc (diff)
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ringbuf: add thread-safe, thread-specific reset functions
This will allow both the reader and writer threads to reset the ringbuffer in a thread-safe fashion. git-svn-id: https://svn.musicpd.org/mpd/trunk@7390 09075e82-0dd4-0310-85a5-a0d7c8717e4f
Diffstat (limited to 'src')
-rw-r--r--src/ringbuf.c12
-rw-r--r--src/ringbuf.h18
2 files changed, 30 insertions, 0 deletions
diff --git a/src/ringbuf.c b/src/ringbuf.c
index 569a70757..ed46c3beb 100644
--- a/src/ringbuf.c
+++ b/src/ringbuf.c
@@ -62,6 +62,18 @@ void ringbuf_reset(struct ringbuf * rb)
rb->write_ptr = 0;
}
+/* Reset the read and write pointers, thread-safe iff called only by writer */
+void ringbuf_writer_reset(struct ringbuf * rb)
+{
+ rb->write_ptr = rb->read_ptr;
+}
+
+/* Reset the read and write pointers, thread-safe iff called only by reader */
+void ringbuf_reader_reset(struct ringbuf * rb)
+{
+ rb->read_ptr = rb->write_ptr;
+}
+
/*
* Return the number of bytes available for reading. This is the
* number of bytes in front of the read pointer and behind the write
diff --git a/src/ringbuf.h b/src/ringbuf.h
index 1465e8fa2..d4baffdbd 100644
--- a/src/ringbuf.h
+++ b/src/ringbuf.h
@@ -173,6 +173,24 @@ size_t ringbuf_read_space(const struct ringbuf * rb);
void ringbuf_reset(struct ringbuf * rb);
/**
+ * Reset the write pointer to the read pointer, making an empty buffer.
+ *
+ * This should only be called by the writer
+ *
+ * @param rb a pointer to the ringbuffer structure.
+ */
+void ringbuf_writer_reset(struct ringbuf * rb);
+
+/**
+ * Reset the read pointer to the write pointer, making an empty buffer.
+ *
+ * This should only be called by the reader
+ *
+ * @param rb a pointer to the ringbuffer structure.
+ */
+void ringbuf_reader_reset(struct ringbuf * rb);
+
+/**
* Write data into the ringbuffer.
*
* @param rb a pointer to the ringbuffer structure.