Return error upon attemping to create named objects in PAL.

Update PAL APIs that create named objects (mutex, semaphore, event, file mapping) to return a not-supported error code. It was decided to not support cross-process synchronization in PAL at present time due to complexities involved in reliably emulating Windows' behavior. @stephentoub has already made changes on the FX side to throw PlatformNotSupportedException in these cases.

Related to issue #1237.

1 files changed, 3 insertions, 8 deletions

diff --git a/src/md/enc/stgio.cpp b/src/md/enc/stgio.cpp
index 020cf66b05..6c665c88b9 100644
--- a/src/md/enc/stgio.cpp
+++ b/src/md/enc/stgio.cpp
@@ -112,7 +112,6 @@ void StgIO::CtorInit()
     m_cbBuff = 0;
     m_rgPageMap = 0;
     m_FileType = FILETYPE_UNKNOWN;
-    *m_rcShared = '\0';
     m_cRef = 1;
     m_mtMappedType = MTYPE_NOMAPPING;
 }
@@ -787,10 +786,8 @@ HRESULT StgIO::MapFileToMem(            // Return code.
     // Check the size of the data we want to map.  If it is small enough, then
     // simply allocate a chunk of memory from a finer grained heap.  This saves
     // virtual memory space, page table entries, and should reduce overall working set.
-    // Note that any shared memory objects will require the handles to be in place
-    // and are not elligible.  Also, open for read/write needs a full backing
-    // store.
-    if (!*m_rcShared && (m_cbData <= SMALL_ALLOC_MAP_SIZE) && (SMALL_ALLOC_MAP_SIZE > 0))
+    // Also, open for read/write needs a full backing store.
+    if ((m_cbData <= SMALL_ALLOC_MAP_SIZE) && (SMALL_ALLOC_MAP_SIZE > 0))
     {
         DWORD cbRead = m_cbData;
         _ASSERTE(m_pData == 0);
@@ -854,8 +851,6 @@ HRESULT StgIO::MapFileToMem(            // Return code.
         // change for the life of the handle.
         if ((m_fFlags & DBPROP_TMODEF_WRITE) == 0 && m_iType != STGIO_STREAM)
         {
-            _ASSERTE(!*m_rcShared);
-
             // Create a mapping object for the file.
             _ASSERTE(m_hMapping == 0);
 
@@ -869,7 +864,7 @@ HRESULT StgIO::MapFileToMem(            // Return code.
 #endif
             
             if ((m_hMapping = WszCreateFileMapping(m_hFile, pAttributes, dwProtectionFlags,
-                0, 0, *m_rcShared ? m_rcShared : 0)) == 0)
+                0, 0, nullptr)) == 0)
             {
                 return (MapFileError(GetLastError()));
             }