Check in the pristine copy of ICU 4.6...

icu46/source/common/mutex.cpp

+/*
+*******************************************************************************
+*
+*   Copyright (C) 2008-2010, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+*******************************************************************************
+*   file name:  mutex.cpp
+*   encoding:   US-ASCII
+*   tab size:   8 (not used)
+*   indentation:4
+*/
+
+#include "unicode/utypes.h"
+#include "mutex.h"
+
+U_NAMESPACE_BEGIN
+
+void *SimpleSingleton::getInstance(InstantiatorFn *instantiator, const void *context,
+                                   void *&duplicate,
+                                   UErrorCode &errorCode) {
+    duplicate=NULL;
+    if(U_FAILURE(errorCode)) {
+        return NULL;
+    }
+    void *instance;
+    UMTX_CHECK(NULL, fInstance, instance);
+    if(instance!=NULL) {
+        return instance;
+    } else {
+        instance=instantiator(context, errorCode);
+        Mutex mutex;
+        if(fInstance==NULL && U_SUCCESS(errorCode)) {
+            fInstance=instance;
+        } else {
+            duplicate=instance;
+        }
+        return fInstance;
+    }
+}
+
+void *TriStateSingleton::getInstance(InstantiatorFn *instantiator, const void *context,
+                                     void *&duplicate,
+                                     UErrorCode &errorCode) {
+    duplicate=NULL;
+    if(U_FAILURE(errorCode)) {
+        return NULL;
+    }
+    int8_t haveInstance;
+    UMTX_CHECK(NULL, fHaveInstance, haveInstance);
+    if(haveInstance>0) {
+        return fInstance;  // instance was created
+    } else if(haveInstance<0) {
+        errorCode=fErrorCode;  // instance creation failed
+        return NULL;
+    } else /* haveInstance==0 */ {
+        void *instance=instantiator(context, errorCode);
+        Mutex mutex;
+        if(fHaveInstance==0) {
+            if(U_SUCCESS(errorCode)) {
+                fInstance=instance;
+                instance=NULL;
+                fHaveInstance=1;
+            } else {
+                fErrorCode=errorCode;
+                fHaveInstance=-1;
+            }
+        } else {
+            errorCode=fErrorCode;
+        }
+        duplicate=instance;
+        return fInstance;
+    }
+}
+
+void TriStateSingleton::reset() {
+    fInstance=NULL;
+    fErrorCode=U_ZERO_ERROR;
+    fHaveInstance=0;
+}
+
+#if UCONFIG_NO_SERVICE
+
+/* If UCONFIG_NO_SERVICE, then there is no invocation of Mutex elsewhere in
+   common, so add one here to force an export */
+static Mutex *aMutex = 0;
+
+/* UCONFIG_NO_SERVICE */
+#endif
+
+U_NAMESPACE_END