#include <common/consumer/consumer.h>
+enum consumer_metadata_cache_write_status {
+ CONSUMER_METADATA_CACHE_WRITE_STATUS_ERROR = -1,
+ /*
+ * New metadata content was appended to the cache successfully.
+ * Previously available content remains valid.
+ */
+ CONSUMER_METADATA_CACHE_WRITE_STATUS_APPENDED_CONTENT = 0,
+ /*
+ * The new content pushed to the cache invalidated the content that
+ * was already present. The contents of the cache should be re-read.
+ */
+ CONSUMER_METADATA_CACHE_WRITE_STATUS_INVALIDATED,
+ /*
+ * A metadata cache write can simply overwrite an already existing
+ * section of the cache (and it should be a write-through with identical
+ * data). From the caller's standpoint, there is no change to the state
+ * of the cache.
+ */
+ CONSUMER_METADATA_CACHE_WRITE_STATUS_NO_CHANGE,
+};
+
struct consumer_metadata_cache {
char *data;
uint64_t cache_alloc_size;
pthread_mutex_t lock;
};
-int consumer_metadata_cache_write(struct lttng_consumer_channel *channel,
+enum consumer_metadata_cache_write_status
+consumer_metadata_cache_write(struct lttng_consumer_channel *channel,
unsigned int offset, unsigned int len, uint64_t version,
char *data);
int consumer_metadata_cache_allocate(struct lttng_consumer_channel *channel);
void consumer_metadata_cache_destroy(struct lttng_consumer_channel *channel);
int consumer_metadata_cache_flushed(struct lttng_consumer_channel *channel,
uint64_t offset, int timer);
-int consumer_metadata_wakeup_pipe(const struct lttng_consumer_channel *channel);
#endif /* CONSUMER_METADATA_CACHE_H */