make CharClass also mutex-protect calls to its dependent class

When calc_tests runs test_tdf53482_Range_contains_column_headings_file()
with Calc's threading enabled, it ends up calling ScInterpreter::ScProper()
from threads, which calls to CharClass. And while CharClass tries to be
thread-safe (guessing from the mutex usage), it forwards calls to i18npool's
CharacterClassificationImpl and cclass_Unicode, both of which aren't
thread-safe. Which makes thread safety of CharClass itself pointless.

Since CharClass already acquires the mutex anyway because of getMyLocale(),
just extend the duration for the entire call, which hopefully shouldn't
make that much of a difference.

Change-Id: I544b34d7e58c4a901f3b6e3a3ff52156b9e320a8
Reviewed-on: https://gerrit.libreoffice.org/54999Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Luboš Luňák <l.lunak@collabora.com>

unotools/source/i18n/charclass.cxx

@@ -64,7 +64,7 @@ const LanguageTag& CharClass::getLanguageTag() const
 
 const css::lang::Locale& CharClass::getMyLocale() const
 {
-    ::osl::MutexGuard aGuard( aMutex );
+    // Mutex locked by callers.
     return maLanguageTag.getLocale();
 }
 
@@ -113,8 +113,11 @@ bool CharClass::isAlpha( const OUString& rStr, sal_Int32 nPos ) const
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return  (xCC->getCharacterType( rStr, nPos, getMyLocale() ) &
                      nCharClassAlphaType) != 0;
+        }
     }
     catch ( const Exception& )
     {
@@ -132,8 +135,11 @@ bool CharClass::isLetter( const OUString& rStr, sal_Int32 nPos ) const
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return  (xCC->getCharacterType( rStr, nPos, getMyLocale() ) &
                      nCharClassLetterType) != 0;
+        }
     }
     catch ( const Exception& )
     {
@@ -147,7 +153,10 @@ bool CharClass::isLetter( const OUString& rStr ) const
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return isLetterType( xCC->getStringType( rStr, 0, rStr.getLength(), getMyLocale() ) );
+        }
     }
     catch ( const Exception& )
     {
@@ -165,8 +174,11 @@ bool CharClass::isDigit( const OUString& rStr, sal_Int32 nPos ) const
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return  (xCC->getCharacterType( rStr, nPos, getMyLocale() ) &
                      KCharacterType::DIGIT) != 0;
+        }
     }
     catch ( const Exception& )
     {
@@ -180,7 +192,10 @@ bool CharClass::isNumeric( const OUString& rStr ) const
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return isNumericType( xCC->getStringType( rStr, 0, rStr.getLength(), getMyLocale() ) );
+        }
     }
     catch ( const Exception& )
     {
@@ -198,8 +213,11 @@ bool CharClass::isAlphaNumeric( const OUString& rStr, sal_Int32 nPos ) const
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return  (xCC->getCharacterType( rStr, nPos, getMyLocale() ) &
                 (nCharClassAlphaType | KCharacterType::DIGIT)) != 0;
+        }
     }
     catch ( const Exception& )
     {
@@ -217,8 +235,11 @@ bool CharClass::isLetterNumeric( const OUString& rStr, sal_Int32 nPos ) const
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return  (xCC->getCharacterType( rStr, nPos, getMyLocale() ) &
                      (nCharClassLetterType | KCharacterType::DIGIT)) != 0;
+        }
     }
     catch ( const Exception& )
     {
@@ -232,7 +253,10 @@ bool CharClass::isLetterNumeric( const OUString& rStr ) const
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return isLetterNumericType( xCC->getStringType( rStr, 0, rStr.getLength(), getMyLocale() ) );
+        }
     }
     catch ( const Exception& )
     {
@@ -246,7 +270,10 @@ OUString CharClass::titlecase(const OUString& rStr, sal_Int32 nPos, sal_Int32 nC
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return xCC->toTitle( rStr, nPos, nCount, getMyLocale() );
+        }
     }
     catch ( const Exception& )
     {
@@ -260,7 +287,10 @@ OUString CharClass::uppercase( const OUString& rStr, sal_Int32 nPos, sal_Int32 n
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return xCC->toUpper( rStr, nPos, nCount, getMyLocale() );
+        }
     }
     catch ( const Exception& )
     {
@@ -274,7 +304,10 @@ OUString CharClass::lowercase( const OUString& rStr, sal_Int32 nPos, sal_Int32 n
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return xCC->toLower( rStr, nPos, nCount, getMyLocale() );
+        }
     }
     catch ( const Exception& )
     {
@@ -288,7 +321,10 @@ sal_Int16 CharClass::getType( const OUString& rStr, sal_Int32 nPos ) const
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return xCC->getType( rStr, nPos );
+        }
     }
     catch ( const Exception& )
     {
@@ -302,7 +338,10 @@ css::i18n::DirectionProperty CharClass::getCharacterDirection( const OUString& r
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return static_cast<css::i18n::DirectionProperty>(xCC->getCharacterDirection( rStr, nPos ));
+        }
     }
     catch ( const Exception& )
     {
@@ -316,7 +355,10 @@ css::i18n::UnicodeScript CharClass::getScript( const OUString& rStr, sal_Int32 n
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return static_cast<css::i18n::UnicodeScript>(xCC->getScript( rStr, nPos ));
+        }
     }
     catch ( const Exception& )
     {
@@ -330,7 +372,10 @@ sal_Int32 CharClass::getCharacterType( const OUString& rStr, sal_Int32 nPos ) co
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return xCC->getCharacterType( rStr, nPos, getMyLocale() );
+        }
     }
     catch ( const Exception& )
     {
@@ -344,7 +389,10 @@ sal_Int32 CharClass::getStringType( const OUString& rStr, sal_Int32 nPos, sal_In
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return xCC->getStringType( rStr, nPos, nCount, getMyLocale() );
+        }
     }
     catch ( const Exception& )
     {
@@ -364,9 +412,12 @@ css::i18n::ParseResult CharClass::parseAnyToken(
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return xCC->parseAnyToken( rStr, nPos, getMyLocale(),
                 nStartCharFlags, userDefinedCharactersStart,
                 nContCharFlags, userDefinedCharactersCont );
+        }
     }
     catch ( const Exception& e )
     {
@@ -387,9 +438,12 @@ css::i18n::ParseResult CharClass::parsePredefinedToken(
     try
     {
         if ( xCC.is() )
+        {
+            ::osl::MutexGuard aGuard( aMutex );
             return xCC->parsePredefinedToken( nTokenType, rStr, nPos, getMyLocale(),
                 nStartCharFlags, userDefinedCharactersStart,
                 nContCharFlags, userDefinedCharactersCont );
+        }
     }
     catch ( const Exception& e )
     {