#include <common/utils.h>
#include <common/index/index.h>
#include <common/consumer/consumer.h>
+#include <common/shm.h>
#include <common/optional.h>
#include "ust-consumer.h"
return ret;
}
-/*
- * create_posix_shm is never called concurrently within a process.
- */
-static
-int create_posix_shm(void)
-{
- char tmp_name[NAME_MAX];
- int shmfd, ret;
-
- ret = snprintf(tmp_name, NAME_MAX, "/ust-shm-consumer-%d", getpid());
- if (ret < 0) {
- PERROR("snprintf");
- return -1;
- }
- /*
- * Allocate shm, and immediately unlink its shm oject, keeping
- * only the file descriptor as a reference to the object.
- * We specifically do _not_ use the / at the beginning of the
- * pathname so that some OS implementations can keep it local to
- * the process (POSIX leaves this implementation-defined).
- */
- shmfd = shm_open(tmp_name, O_CREAT | O_EXCL | O_RDWR, 0700);
- if (shmfd < 0) {
- PERROR("shm_open");
- goto error_shm_open;
- }
- ret = shm_unlink(tmp_name);
- if (ret < 0 && errno != ENOENT) {
- PERROR("shm_unlink");
- goto error_shm_release;
- }
- return shmfd;
-
-error_shm_release:
- ret = close(shmfd);
- if (ret) {
- PERROR("close");
- }
-error_shm_open:
- return -1;
-}
-
static int open_ust_stream_fd(struct lttng_consumer_channel *channel, int cpu,
const struct lttng_credentials *session_credentials)
{
int ret;
if (!channel->shm_path[0]) {
- return create_posix_shm();
+ return shm_create_anonymous("ust-consumer");
}
ret = get_stream_shm_path(shm_path, channel->shm_path, cpu);
if (ret) {
return ret;
}
+static
+void metadata_stream_reset_cache_consumed_position(
+ struct lttng_consumer_stream *stream)
+{
+ ASSERT_LOCKED(stream->lock);
+
+ DBG("Reset metadata cache of session %" PRIu64,
+ stream->chan->session_id);
+ stream->ust_metadata_pushed = 0;
+}
+
/*
* Receive the metadata updates from the sessiond. Supports receiving
* overlapping metadata, but is needs to always belong to a contiguous
{
int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS;
char *metadata_str;
+ enum consumer_metadata_cache_write_status cache_write_status;
DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len);
health_code_update();
pthread_mutex_lock(&channel->metadata_cache->lock);
- ret = consumer_metadata_cache_write(channel, offset, len, version,
+ cache_write_status = consumer_metadata_cache_write(
+ channel->metadata_cache, offset, len, version,
metadata_str);
- if (ret < 0) {
+ pthread_mutex_unlock(&channel->metadata_cache->lock);
+ switch (cache_write_status) {
+ case CONSUMER_METADATA_CACHE_WRITE_STATUS_NO_CHANGE:
+ /*
+ * The write entirely overlapped with existing contents of the
+ * same metadata version (same content); there is nothing to do.
+ */
+ break;
+ case CONSUMER_METADATA_CACHE_WRITE_STATUS_INVALIDATED:
+ /*
+ * The metadata cache was invalidated (previously pushed
+ * content has been overwritten). Reset the stream's consumed
+ * metadata position to ensure the metadata poll thread consumes
+ * the whole cache.
+ */
+ pthread_mutex_lock(&channel->metadata_stream->lock);
+ metadata_stream_reset_cache_consumed_position(
+ channel->metadata_stream);
+ pthread_mutex_unlock(&channel->metadata_stream->lock);
+ /* Fall-through. */
+ case CONSUMER_METADATA_CACHE_WRITE_STATUS_APPENDED_CONTENT:
+ /*
+ * In both cases, the metadata poll thread has new data to
+ * consume.
+ */
+ ret = consumer_metadata_wakeup_pipe(channel);
+ if (ret) {
+ ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA;
+ goto end_free;
+ }
+ break;
+ case CONSUMER_METADATA_CACHE_WRITE_STATUS_ERROR:
/* Unable to handle metadata. Notify session daemon. */
ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA;
/*
* not have been updated which could create an infinite loop below when
* waiting for the metadata cache to be flushed.
*/
- pthread_mutex_unlock(&channel->metadata_cache->lock);
goto end_free;
+ default:
+ abort();
}
- pthread_mutex_unlock(&channel->metadata_cache->lock);
if (!wait) {
goto end_free;
return ustctl_stream_close_wakeup_fd(stream->ustream);
}
-static
-void metadata_stream_reset_cache_consumed_position(
- struct lttng_consumer_stream *stream)
-{
- DBG("Reset metadata cache of session %" PRIu64,
- stream->chan->session_id);
- stream->ust_metadata_pushed = 0;
-}
-
/*
* Write up to one packet from the metadata cache to the channel.
*
int ret;
pthread_mutex_lock(&stream->chan->metadata_cache->lock);
- if (stream->chan->metadata_cache->max_offset ==
- stream->ust_metadata_pushed) {
+ if (stream->chan->metadata_cache->contents.size ==
+ stream->ust_metadata_pushed) {
/*
* In the context of a user space metadata channel, a
* change in version can be detected in two ways:
}
write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan,
- &stream->chan->metadata_cache->data[stream->ust_metadata_pushed],
- stream->chan->metadata_cache->max_offset
- - stream->ust_metadata_pushed);
+ &stream->chan->metadata_cache->contents.data[stream->ust_metadata_pushed],
+ stream->chan->metadata_cache->contents.size -
+ stream->ust_metadata_pushed);
assert(write_len != 0);
if (write_len < 0) {
ERR("Writing one metadata packet");
}
stream->ust_metadata_pushed += write_len;
- assert(stream->chan->metadata_cache->max_offset >=
+ assert(stream->chan->metadata_cache->contents.size >=
stream->ust_metadata_pushed);
ret = write_len;
}
} else {
pthread_mutex_lock(&stream->chan->metadata_cache->lock);
- cache_empty = stream->chan->metadata_cache->max_offset ==
- stream->ust_metadata_pushed;
+ cache_empty = stream->chan->metadata_cache->contents.size ==
+ stream->ust_metadata_pushed;
pthread_mutex_unlock(&stream->chan->metadata_cache->lock);
}
} while (!got_subbuffer);
static int signal_metadata(struct lttng_consumer_stream *stream,
struct lttng_consumer_local_data *ctx)
{
+ ASSERT_LOCKED(stream->metadata_rdv_lock);
return pthread_cond_broadcast(&stream->metadata_rdv) ? -errno : 0;
}
assert(stream);
assert(stream->ustream);
+ ASSERT_LOCKED(stream->lock);
DBG("UST consumer checking data pending");
uint64_t contiguous, pushed;
/* Ease our life a bit. */
- contiguous = stream->chan->metadata_cache->max_offset;
+ pthread_mutex_lock(&stream->chan->metadata_cache->lock);
+ contiguous = stream->chan->metadata_cache->contents.size;
+ pthread_mutex_unlock(&stream->chan->metadata_cache->lock);
pushed = stream->ust_metadata_pushed;
/*
projects / lttng-tools.git / blobdiff