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Fix thread support (at least don't deadlock with oneself)
small fixes for coroutining predicates
force Yap to recover space in arrays of dbrefs
use private predicates in debugger.


git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1084 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

C/corout.c

@@ -554,8 +554,8 @@ Yap_InitCoroutPreds(void)
   at = Yap_LookupAtom("$wake_up_goal");
   pred = RepPredProp(PredPropByFunc(Yap_MkFunctor(at, 2),0));
   WakeUpCode = pred;
+#endif
   Yap_InitAttVarPreds();
-#endif /* COROUTINING */
   Yap_InitCPred("$yap_has_rational_trees", 0, p_yap_has_rational_trees, SafePredFlag);
   Yap_InitCPred("$yap_has_coroutining", 0, p_yap_has_coroutining, SafePredFlag);
   Yap_InitCPred("$read_svar_list", 1, p_read_svar_list, SafePredFlag);