ICU-770 add transliterator cleanup support

X-SVN-Rev: 5820

icu4c/source/i18n/translit.cpp

@@ -1440,4 +1440,26 @@ void Transliterator::initializeRegistry(void) {
     NormalizationTransliterator::registerIDs();
 }
 
+// Defined in ucln_in.h:
+
+/**
+ * Cleanup function for transliterator component; delegates to
+ * Transliterator::cleanupRegistry().
+ */
+U_CFUNC UBool transliterator_cleanup(void) {
+    Transliterator::cleanupRegistry();
+    return TRUE;
+}
+
+/**
+ * Release all static memory held by transliterator.  This will
+ * necessarily invalidate any rule-based transliterators held by the
+ * user, because RBTs hold pointers to common data objects.
+ */ 
+void Transliterator::cleanupRegistry() {
+    Mutex lock(&registryMutex);
+    delete registry;
+    registry = 0;
+}
+
 //eof

icu4c/source/i18n/ucln_in.c

@@ -22,6 +22,7 @@ static UBool i18n_cleanup(void)
     ucol_bld_cleanup();
     ucol_cleanup();
     timeZone_cleanup();
+    transliterator_cleanup();
     return TRUE;
 }
 

icu4c/source/i18n/ucln_in.h

@@ -28,4 +28,6 @@ U_CFUNC UBool ucol_bld_cleanup(void);
 
 U_CFUNC UBool timeZone_cleanup(void);
 
+U_CFUNC UBool transliterator_cleanup(void);
+
 #endif

icu4c/source/i18n/unicode/translit.h

@@ -20,6 +20,8 @@ class Hashtable;
 class U_I18N_API UVector;
 class CompoundTransliterator;
 
+U_CFUNC UBool transliterator_cleanup();
+
 /**
  * <code>Transliterator</code> is an abstract class that
  * transliterates text from one format to another.  The most common
@@ -923,6 +925,9 @@ protected:
 
 private:
     static void initializeRegistry(void);
+
+    friend UBool transliterator_cleanup();
+    static void cleanupRegistry(void);
 };
 
 inline int32_t Transliterator::getMaximumContextLength(void) const {