From a025b017d398818300ad45c92284116d64c56fc1 Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Thu, 1 Mar 2012 12:15:34 -0500 Subject: [PATCH] Fix effect: update README about dlopen() Signed-off-by: Mathieu Desnoyers --- README | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/README b/README index 78ed56f6..8193c660 100644 --- a/README +++ b/README @@ -90,15 +90,11 @@ USAGE: - Link application with "-ldl" on Linux, "-lc" on BSD. - Set a LD_PRELOAD environment to preload the tracepoint provider shared object before starting the application when tracing is - needed. + needed. Another way is to dlopen the tracepoint probe when needed + by the application. - Example: - tests/demo/ demo.c tp*.c ust_tests_demo*.h demo-trace - - Note about dlopen() usage: due to locking side-effects due to the - way libc lazily resolves Thread-Local Storage (TLS) symbols when a - library is dlopen'd, linking the tracepoint probe or liblttng-ust - with dlopen() is discouraged. They should be linked with the - application using "-llibname" or loaded with LD_PRELOAD. - Enable instrumentation and control tracing with the "lttng" command from lttng-tools. See lttng-tools doc/quickstart.txt. -- 2.34.1