diff options
Diffstat (limited to 'mysys/my_static.c')
| -rw-r--r-- | mysys/my_static.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/mysys/my_static.c b/mysys/my_static.c index 62e6d402315..fb62e92dfd1 100644 --- a/mysys/my_static.c +++ b/mysys/my_static.c @@ -111,3 +111,31 @@ my_bool NEAR my_disable_async_io=0; my_bool NEAR my_disable_flush_key_blocks=0; my_bool NEAR my_disable_symlinks=0; my_bool NEAR mysys_uses_curses=0; + +/* + Note that PSI_hook and PSI_server are unconditionally + (no ifdef HAVE_PSI_INTERFACE) defined. + This is to ensure binary compatibility between the server and plugins, + in the case when: + - the server is not compiled with HAVE_PSI_INTERFACE + - a plugin is compiled with HAVE_PSI_INTERFACE + See the doxygen documentation for the performance schema. +*/ + +/** + Hook for the instrumentation interface. + Code implementing the instrumentation interface should register here. +*/ +struct PSI_bootstrap *PSI_hook= NULL; + +/** + Instance of the instrumentation interface for the MySQL server. + @todo This is currently a global variable, which is handy when + compiling instrumented code that is bundled with the server. + When dynamic plugin are truly supported, this variable will need + to be replaced by a macro, so that each XYZ plugin can have it's own + xyz_psi_server variable, obtained from PSI_bootstrap::get_interface() + with the version used at compile time for plugin XYZ. +*/ +PSI *PSI_server= NULL; + |