Add tracepoint_disable_destructors()

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

diff --git a/include/lttng/tracepoint.h b/include/lttng/tracepoint.h
index 16348b86106c98e15abe58cf62b8fc11cdc43a4c..ed20594497ab65bab366b594bb965e740d3e9b29 100644 (file)
--- a/include/lttng/tracepoint.h
+++ b/include/lttng/tracepoint.h
@@ -227,6 +227,21 @@ struct lttng_ust_tracepoint_dlopen {
 
 extern struct lttng_ust_tracepoint_dlopen tracepoint_dlopen;
 
+/* Disable tracepoint destructors. */
+int __tracepoints__disable_destructors __attribute__((weak));
+
+/*
+ * Programs that have threads that survive after they exit, and
+ * therefore call library destructors, should disable the tracepoint
+ * destructors by calling tracepoint_disable_destructors(). This will
+ * leak the tracepoint instrumentation library shared object, leaving
+ * its teardown to the operating system process teardown.
+ */
+static inline void tracepoint_disable_destructors(void)
+{
+       __tracepoints__disable_destructors = 1;
+}
+
 #if defined(TRACEPOINT_DEFINE) || defined(TRACEPOINT_CREATE_PROBES)
 
 /*
@@ -301,7 +316,9 @@ __tracepoints__destroy(void)
 
        if (--__tracepoint_registered)
                return;
-       if (tracepoint_dlopen.liblttngust_handle && !__tracepoint_ptrs_registered) {
+       if (!__tracepoints__disable_destructors
+                       && tracepoint_dlopen.liblttngust_handle
+                       && !__tracepoint_ptrs_registered) {
                ret = dlclose(tracepoint_dlopen.liblttngust_handle);
                if (ret) {
                        fprintf(stderr, "Error (%d) in dlclose\n", ret);
@@ -406,7 +423,9 @@ __tracepoints__ptrs_destroy(void)
                return;
        if (tracepoint_dlopen.tracepoint_unregister_lib)
                tracepoint_dlopen.tracepoint_unregister_lib(__start___tracepoints_ptrs);
-       if (tracepoint_dlopen.liblttngust_handle && !__tracepoint_registered) {
+       if (!__tracepoints__disable_destructors
+                       && tracepoint_dlopen.liblttngust_handle
+                       && !__tracepoint_ptrs_registered) {
                ret = dlclose(tracepoint_dlopen.liblttngust_handle);
                if (ret) {
                        fprintf(stderr, "Error (%d) in dlclose\n", ret);