.

wcfs/client/wcfs_misc.cpp

@@ -266,6 +266,7 @@ void __Logf(const char *file, int line, char level, const char *format, ...) {
 
     string prefix = fmt::sprintf("%c%s.%06d % 7d %s:%d] ", level, t_buf, t_us, tid, file, line);
     // XXX better to emit prefix and msg in one go.
+    flockfile(stderr);
     fprintf(stderr, "%s", v(prefix));
 
     va_list argp;
@@ -274,6 +275,7 @@ void __Logf(const char *file, int line, char level, const char *format, ...) {
     va_end(argp);
 
     fprintf(stderr, "\n");
+    funlockfile(stderr);
 }
 
 }}  // golang::log::