Fix: fixup vtid TLS

[lttng-ust.git] / liblttng-ust / lttng-context-vtid.c

diff --git a/liblttng-ust/lttng-context-vtid.c b/liblttng-ust/lttng-context-vtid.c
index 3fe86405c112307a47e6c1abe0a9c62fe8b2175b..c419d18b3ede7db666d2c5ea3cada82df6dafcbd 100644 (file)
--- a/liblttng-ust/lttng-context-vtid.c
+++ b/liblttng-ust/lttng-context-vtid.c
@@ -13,6 +13,7 @@
 #include <lttng/ust-tracer.h>
 #include <lttng/ringbuffer-config.h>
 #include <lttng/ust-tid.h>
+#include "ltt-tracer-core.h"
 
 /*
  * We cache the result to ensure we don't trigger a system call for
@@ -74,3 +75,11 @@ int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx)
        field->record = vtid_record;
        return 0;
 }
+
+/*
+ * Force a read (imply TLS fixup for dlopen) of TLS variables.
+ */
+void lttng_fixup_vtid_tls(void)
+{
+       asm volatile ("" : : "m" (cached_vtid));
+}