doc: add Python example

[lttng-ust.git] / include / lttng / tracepoint.h

diff --git a/include/lttng/tracepoint.h b/include/lttng/tracepoint.h
index 63759a20ee3da5f7a7e0beb6f08219c8567abe55..4bc4fc9e4446db05feeecbe1a5d9d09e9df87ab9 100644 (file)
--- a/include/lttng/tracepoint.h
+++ b/include/lttng/tracepoint.h
@@ -28,6 +28,7 @@
 #include <lttng/tracepoint-types.h>
 #include <lttng/tracepoint-rcu.h>
 #include <urcu/compiler.h>
+#include <urcu/system.h>
 #include <dlfcn.h>     /* for dlopen */
 #include <string.h>    /* for memset */
 #include <lttng/ust-config.h>  /* for sdt */
@@ -44,11 +45,17 @@
 extern "C" {
 #endif
 
+#define tracepoint_enabled(provider, name) \
+       caa_unlikely(CMM_LOAD_SHARED(__tracepoint_##provider##___##name.state))
+
+#define do_tracepoint(provider, name, ...) \
+       __tracepoint_cb_##provider##___##name(__VA_ARGS__)
+
 #define tracepoint(provider, name, ...)                                            \
        do {                                                                \
                STAP_PROBEV(provider, name, ## __VA_ARGS__);                \
-               if (caa_unlikely(__tracepoint_##provider##___##name.state)) \
-                       __tracepoint_cb_##provider##___##name(__VA_ARGS__); \
+               if (tracepoint_enabled(provider, name))                     \
+                       do_tracepoint(provider, name, __VA_ARGS__);         \
        } while (0)
 
 #define TP_ARGS(...)       __VA_ARGS__