Merge branch 'master' into cq_mpsc_based

1 files changed, 27 insertions, 1 deletions

diff --git a/src/core/lib/debug/trace.h b/src/core/lib/debug/trace.h
index 7afc38db7e..ba432574d0 100644
--- a/src/core/lib/debug/trace.h
+++ b/src/core/lib/debug/trace.h
@@ -34,9 +34,35 @@
 #ifndef GRPC_CORE_LIB_DEBUG_TRACE_H
 #define GRPC_CORE_LIB_DEBUG_TRACE_H
 
+#include <grpc/support/atm.h>
 #include <grpc/support/port_platform.h>
+#include <stdbool.h>
 
-void grpc_register_tracer(const char *name, int *flag);
+#if defined(__has_feature)
+#if __has_feature(thread_sanitizer)
+#define GRPC_THREADSAFE_TRACER
+#endif
+#endif
+
+typedef struct {
+#ifdef GRPC_THREADSAFE_TRACER
+  gpr_atm value;
+#else
+  bool value;
+#endif
+} grpc_tracer_flag;
+
+#ifdef GRPC_THREADSAFE_TRACER
+#define GRPC_TRACER_ON(flag) (gpr_atm_no_barrier_load(&(flag).value) != 0)
+#define GRPC_TRACER_INITIALIZER(on) \
+  { (gpr_atm)(on) }
+#else
+#define GRPC_TRACER_ON(flag) ((flag).value)
+#define GRPC_TRACER_INITIALIZER(on) \
+  { (on) }
+#endif
+
+void grpc_register_tracer(const char *name, grpc_tracer_flag *flag);
 void grpc_tracer_init(const char *env_var_name);
 void grpc_tracer_shutdown(void);