bus: add benchmark tool to determine the right threshold for copying vs. memfd

[elogind.git] / src / libsystemd-bus / bus-internal.h

diff --git a/src/libsystemd-bus/bus-internal.h b/src/libsystemd-bus/bus-internal.h
index 9a118f8a213f0b1984b9d2af7db0527cc6c0fe91..30b8d519a0a653bf55641ab52db46f8e3cac12c9 100644 (file)
--- a/src/libsystemd-bus/bus-internal.h
+++ b/src/libsystemd-bus/bus-internal.h
@@ -24,15 +24,18 @@
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <netinet/in.h>
+#include <pthread.h>
 
 #include "hashmap.h"
 #include "prioq.h"
 #include "list.h"
 #include "util.h"
+#include "refcnt.h"
 
 #include "sd-bus.h"
 #include "bus-error.h"
 #include "bus-match.h"
+#include "bus-kernel.h"
 
 struct reply_callback {
         sd_bus_message_handler_t callback;
@@ -66,9 +69,14 @@ enum bus_state {
         BUS_OPENING,
         BUS_AUTHENTICATING,
         BUS_HELLO,
-        BUS_RUNNING
+        BUS_RUNNING,
+        BUS_CLOSED
 };
 
+static inline bool BUS_IS_OPEN(enum bus_state state) {
+        return state > BUS_UNSET && state < BUS_CLOSED;
+}
+
 enum bus_auth {
         _BUS_AUTH_INVALID,
         BUS_AUTH_EXTERNAL,
@@ -76,13 +84,21 @@ enum bus_auth {
 };
 
 struct sd_bus {
-        unsigned n_ref;
+        /* We use atomic ref counting here since sd_bus_message
+           objects retain references to their originating sd_bus but
+           we want to allow them to be processed in a different
+           thread. We won't provide full thread safety, but only the
+           bare minimum that makes it possible to use sd_bus and
+           sd_bus_message objects independently and on different
+           threads as long as each object is used only once at the
+           same time. */
+        RefCount n_ref;
+
         enum bus_state state;
         int input_fd, output_fd;
         int message_version;
 
         bool is_kernel:1;
-        bool negotiate_fds:1;
         bool can_fds:1;
         bool bus_client:1;
         bool ucred_valid:1;
@@ -95,6 +111,8 @@ struct sd_bus {
         bool filter_callbacks_modified:1;
         bool object_callbacks_modified:1;
 
+        int use_memfd;
+
         void *rbuffer;
         size_t rbuffer_size;
 
@@ -151,7 +169,23 @@ struct sd_bus {
         uint64_t hello_serial;
         unsigned iteration_counter;
 
-        uint64_t bloom_size;
+        void *kdbus_buffer;
+
+        /* We do locking around the memfd cache, since we want to
+         * allow people to process a sd_bus_message in a different
+         * thread then it was generated on and free it there. Since
+         * adding something to the memfd cache might happen when a
+         * message is released, we hence need to protect this bit with
+         * a mutex. */
+        pthread_mutex_t memfd_cache_mutex;
+        struct memfd_cache memfd_cache[MEMFD_CACHE_MAX];
+        unsigned n_memfd_cache;
+
+        pid_t original_pid;
+
+        uint64_t hello_flags;
+
+        uint64_t match_cookie;
 };
 
 static inline void bus_unrefp(sd_bus **b) {
@@ -191,9 +225,12 @@ bool namespace_simple_pattern(const char *pattern, const char *value);
 bool path_simple_pattern(const char *pattern, const char *value);
 
 int bus_message_type_from_string(const char *s, uint8_t *u);
+const char *bus_message_type_to_string(uint8_t u);
 
 #define error_name_is_valid interface_name_is_valid
 
 int bus_ensure_running(sd_bus *bus);
 int bus_start_running(sd_bus *bus);
 int bus_next_address(sd_bus *bus);
+
+bool bus_pid_changed(sd_bus *bus);