#ifndef _LTT_UST_APP_H
#define _LTT_UST_APP_H
-#include "session.hpp"
+#include "trace-class.hpp"
#include "trace-ust.hpp"
-#include "ust-field-convert.hpp"
-#include "ust-registry-session.hpp"
-#include "ust-registry.hpp"
+#include "ust-field-quirks.hpp"
#include <common/format.hpp>
#include <common/index-allocator.hpp>
+#include <common/reference.hpp>
#include <common/scope-exit.hpp>
#include <common/uuid.hpp>
struct lttng_bytecode;
struct lttng_ust_filter_bytecode;
+namespace lttng {
+namespace sessiond {
+namespace ust {
+class registry_session;
+} /* namespace ust */
+} /* namespace sessiond */
+} /* namespace lttng */
+
extern int the_ust_consumerd64_fd, the_ust_consumerd32_fd;
/*
struct ust_app_session {
private:
- static void _session_unlock(ust_app_session *session);
- static void _const_session_unlock(const ust_app_session *session);
+ static void _session_unlock(ust_app_session *session)
+ {
+ _const_session_unlock(session);
+ }
+
+ static void _const_session_unlock(const ust_app_session *session)
+ {
+ pthread_mutex_unlock(&session->_lock);
+ }
public:
using locked_weak_ref = lttng::non_copyable_reference<
lttng::memory::create_deleter_class<const ust_app_session,
ust_app_session::_const_session_unlock>::deleter>;
- ust_app_session::const_locked_weak_ref lock() const noexcept;
- ust_app_session::locked_weak_ref lock() noexcept;
+ static locked_weak_ref make_locked_weak_ref(ust_app_session& ua_session)
+ {
+ return lttng::make_non_copyable_reference<locked_weak_ref::referenced_type,
+ locked_weak_ref::deleter>(ua_session);
+ }
+
+ static const_locked_weak_ref make_locked_weak_ref(const ust_app_session& ua_session)
+ {
+ return lttng::make_non_copyable_reference<const_locked_weak_ref::referenced_type,
+ const_locked_weak_ref::deleter>(
+ ua_session);
+ }
+
+ ust_app_session::const_locked_weak_ref lock() const noexcept
+ {
+ pthread_mutex_lock(&_lock);
+ return ust_app_session::make_locked_weak_ref(*this);
+ }
+
+ ust_app_session::locked_weak_ref lock() noexcept
+ {
+ pthread_mutex_lock(&_lock);
+ return ust_app_session::make_locked_weak_ref(*this);
+ }
+
+ struct identifier {
+ enum class application_abi : std::uint8_t { ABI_32 = 32, ABI_64 = 64 };
+ enum class buffer_allocation_policy : std::uint8_t { PER_PID, PER_UID };
+
+ /* Unique identifier of the ust_app_session. */
+ std::uint64_t id;
+ /* Unique identifier of the ltt_session. */
+ std::uint64_t session_id;
+ /* Credentials of the application which owns the ust_app_session. */
+ lttng_credentials app_credentials;
+ application_abi abi;
+ buffer_allocation_policy allocation_policy;
+ };
+
+ identifier get_identifier() const noexcept
+ {
+ /*
+ * To work around synchro design issues, this method allows the sampling
+ * of a ust_app_session's identifying properties without taking its lock.
+ *
+ * Since those properties are immutable, it is safe to sample them without
+ * holding the lock (as long as the existence of the instance is somehow
+ * guaranteed).
+ *
+ * The locking issue that motivates this method is that the application
+ * notitication handling thread needs to access the registry_session in response to
+ * a message from the application. The ust_app_session's ID is needed to look-up the
+ * registry session.
+ *
+ * The application's message can be emited in response to a command from the
+ * session daemon that is emited by the client thread.
+ *
+ * During that command, the client thread holds the ust_app_session lock until
+ * the application replies to the command. This causes the notification thread
+ * to block when it attempts to sample the ust_app_session's ID properties.
+ */
+ LTTNG_ASSERT(bits_per_long == 32 || bits_per_long == 64);
+ LTTNG_ASSERT(buffer_type == LTTNG_BUFFER_PER_PID ||
+ buffer_type == LTTNG_BUFFER_PER_UID);
+
+ return { .id = id,
+ .session_id = tracing_id,
+ .app_credentials = real_credentials,
+ .abi = bits_per_long == 32 ? identifier::application_abi::ABI_32 :
+ identifier::application_abi::ABI_64,
+ .allocation_policy = buffer_type == LTTNG_BUFFER_PER_PID ?
+ identifier::buffer_allocation_policy::PER_PID :
+ identifier::buffer_allocation_policy::PER_UID };
+ }
bool enabled = false;
/* started: has the session been in started state at any time ? */
void ust_app_add(struct ust_app *app);
struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock);
void ust_app_notify_sock_unregister(int sock);
-ssize_t ust_app_push_metadata(const lttng::sessiond::ust::registry_session::locked_ref& registry,
- struct consumer_socket *socket,
- int send_zero_data);
+
enum lttng_error_code ust_app_snapshot_record(const struct ltt_ust_session *usess,
const struct consumer_output *output,
uint64_t nb_packets_per_stream);
uint64_t *discarded,
uint64_t *lost);
int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess);
-enum lttng_error_code ust_app_rotate_session(const ltt_session::locked_ref& session);
enum lttng_error_code ust_app_create_channel_subdirectories(const struct ltt_ust_session *session);
int ust_app_release_object(struct ust_app *app, struct lttng_ust_abi_object_data *data);
-enum lttng_error_code ust_app_clear_session(const ltt_session::locked_ref& session);
-enum lttng_error_code ust_app_open_packets(const ltt_session::locked_ref& session);
int ust_app_setup_event_notifier_group(struct ust_app *app);
return 1;
}
+ust_app_session *ust_app_lookup_app_session(const struct ltt_ust_session *usess,
+ const struct ust_app *app);
+lttng::sessiond::ust::registry_session *
+ust_app_get_session_registry(const ust_app_session::identifier& identifier);
+
+lttng_ht *ust_app_get_all();
+
bool ust_app_supports_notifiers(const struct ust_app *app);
bool ust_app_supports_counters(const struct ust_app *app);
{
}
-static inline ssize_t ust_app_push_metadata(lttng::sessiond::ust::registry_session *registry
- __attribute__((unused)),
- struct consumer_socket *socket __attribute__((unused)),
- int send_zero_data __attribute__((unused)))
-{
- return 0;
-}
-
static inline enum lttng_error_code
ust_app_snapshot_record(struct ltt_ust_session *usess __attribute__((unused)),
const struct consumer_output *output __attribute__((unused)),
return 0;
}
-static inline enum lttng_error_code ust_app_rotate_session(const ltt_session::locked_ref& session
- __attribute__((unused)))
+static inline enum lttng_error_code
+ust_app_create_channel_subdirectories(const struct ltt_ust_session *session __attribute__((unused)))
{
return LTTNG_ERR_UNK;
}
-static inline enum lttng_error_code
-ust_app_create_channel_subdirectories(const struct ltt_ust_session *session __attribute__((unused)))
+static inline ust_app_session *ust_app_lookup_app_session(const ltt_ust_session *, const ust_app *)
{
- return LTTNG_ERR_UNK;
+ return nullptr;
}
-static inline int ust_app_release_object(struct ust_app *app __attribute__((unused)),
- struct lttng_ust_abi_object_data *data
- __attribute__((unused)))
+static inline lttng::sessiond::ust::registry_session *
+ust_app_get_session_registry(const ust_app_session::identifier&)
{
- return 0;
+ return nullptr;
}
-static inline enum lttng_error_code ust_app_clear_session(const ltt_session::locked_ref& session
- __attribute__((unused)))
+static inline lttng_ht *ust_app_get_all()
{
- return LTTNG_ERR_UNK;
+ return nullptr;
}
-static inline enum lttng_error_code ust_app_open_packets(const ltt_session::locked_ref& session
- __attribute__((unused)))
+static inline int ust_app_release_object(struct ust_app *app __attribute__((unused)),
+ struct lttng_ust_abi_object_data *data
+ __attribute__((unused)))
{
- return LTTNG_ERR_UNK;
+ return 0;
}
static inline void ust_app_get(ust_app& app __attribute__((unused)))
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