#include <stdio.h>
#include <urcu/arch.h>
-#include <urcu-bp.h>
+#include <urcu/urcu-bp.h>
#include <urcu/hlist.h>
#include <urcu/uatomic.h>
#include <urcu/compiler.h>
/* Set to 1 to enable tracepoint debug output */
static const int tracepoint_debug;
static int initialized;
+
+/*
+ * If tracepoint_destructors_state = 1, tracepoint destructors are
+ * enabled. They are disabled otherwise.
+ */
+static int tracepoint_destructors_state = 1;
+
+/*
+ * Expose the now deprecated symbol __tracepoints__disable_destructors for
+ * backward compatibility of applications built against old versions of
+ * lttng-ust. We need to keep __tracepoints__disable_destructors up to date
+ * within the new destructor disabling API because old applications read this
+ * symbol directly.
+ */
+int __tracepoints__disable_destructors __attribute__((weak));
+
static void (*new_tracepoint_cb)(struct lttng_ust_tracepoint *);
/*
if (old) {
struct tp_probes *tp_probes = caa_container_of(old,
struct tp_probes, probes[0]);
- synchronize_rcu();
+ urcu_bp_synchronize_rcu();
free(tp_probes);
}
}
release_queue_need_update = 0;
/* Wait for grace period between all sync_callsites and free. */
- synchronize_rcu();
+ urcu_bp_synchronize_rcu();
cds_list_for_each_entry_safe(pos, next, &release_probes, u.list) {
cds_list_del(&pos->u.list);
tracepoint_update_probes();
/* Wait for grace period between update_probes and free. */
- synchronize_rcu();
+ urcu_bp_synchronize_rcu();
cds_list_for_each_entry_safe(pos, next, &release_probes, u.list) {
cds_list_del(&pos->u.list);
free(pos);
void tp_rcu_read_lock_bp(void)
{
- rcu_read_lock_bp();
+ urcu_bp_read_lock();
}
void tp_rcu_read_unlock_bp(void)
{
- rcu_read_unlock_bp();
+ urcu_bp_read_unlock();
}
void *tp_rcu_dereference_sym_bp(void *p)
{
- return rcu_dereference_bp(p);
+ return urcu_bp_dereference(p);
+}
+
+/*
+ * Programs that have threads that survive after they exit, and therefore call
+ * library destructors, should disable the tracepoint destructors by calling
+ * tp_disable_destructors(). This will leak the tracepoint
+ * instrumentation library shared object, leaving its teardown to the operating
+ * system process teardown.
+ *
+ * To access and/or modify this value, users need to use a combination of
+ * dlopen(3) and dlsym(3) to get an handle on the
+ * tp_disable_destructors and tp_get_destructors_state symbols below.
+ */
+void tp_disable_destructors(void)
+{
+ uatomic_set(&tracepoint_destructors_state, 0);
+}
+
+/*
+ * Returns 1 if the destructors are enabled and should be executed.
+ * Returns 0 if the destructors are disabled.
+ */
+int tp_get_destructors_state(void)
+{
+ return uatomic_read(&tracepoint_destructors_state);
}