lib/signals: do no pin references if the FFI feature is not available

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/signals.nit b/lib/signals.nit
index 8422833..0dead5d 100644 (file)
--- a/lib/signals.nit
+++ b/lib/signals.nit
@@ -141,7 +141,6 @@ interface SignalHandler
        # otherwise the receiver is invoked when the signal is raised, it may
        # crash the Nit system but is unavoidable for unstoppable signals.
        fun handle_signal(signal: Int, safely: Bool) import receive_signal `{
-               SignalHandler last_handler;
                if (signal < 32 && signal >=0) {
                        struct sigaction act;
                        sigemptyset(&act.sa_mask);
@@ -150,21 +149,26 @@ interface SignalHandler
 
                        sigaction(signal, &act, NULL);
 
-                       last_handler = (SignalHandler)nit_signals_list[signal].handler;
+               #ifdef SignalHandler_decr_ref
+                       SignalHandler last_handler = (SignalHandler)nit_signals_list[signal].handler;
                        if (last_handler != NULL)
                                SignalHandler_decr_ref(last_handler);
+               #endif
 
                        nit_signals_list[signal].handler = self;
+
+               #ifdef SignalHandler_incr_ref
                        SignalHandler_incr_ref(self);
+               #endif
 
                        nit_signals_list[signal].safely = safely;
+
                        nit_SignalHandler_receive_signal = SignalHandler_receive_signal;
                }
        `}
 
        # Set to ignore the signal
        fun ignore_signal(signal: Int) `{
-               SignalHandler last_handler;
                if (signal < 32 && signal >=0) {
                        struct sigaction act;
                        sigemptyset(&act.sa_mask);
@@ -172,15 +176,16 @@ interface SignalHandler
                        act.sa_handler = SIG_IGN;
                        sigaction(signal, &act, NULL);
 
-                       last_handler = (SignalHandler)nit_signals_list[signal].handler;
+               #ifdef SignalHandler_decr_ref
+                       SignalHandler last_handler = (SignalHandler)nit_signals_list[signal].handler;
                        if (last_handler != NULL)
                                SignalHandler_decr_ref(last_handler);
+               #endif
                }
        `}
 
        # Set default action for the signal
        fun default_signal(signal: Int) `{
-               SignalHandler last_handler;
                if (signal < 32 && signal >=0) {
                        struct sigaction act;
                        sigemptyset(&act.sa_mask);
@@ -188,9 +193,11 @@ interface SignalHandler
                        act.sa_handler = SIG_DFL;
                        sigaction(signal, &act, NULL);
 
-                       last_handler = (SignalHandler)nit_signals_list[signal].handler;
+               #ifdef SignalHandler_decr_ref
+                       SignalHandler last_handler = (SignalHandler)nit_signals_list[signal].handler;
                        if (last_handler != NULL)
                                SignalHandler_decr_ref(last_handler);
+               #endif
                }
        `}
 end