Unit test addition, cleanup for render_process/thread.

base/shared_memory_posix.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/shared_memory.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/mman.h>
 
@@ skipping 123 matching lines @@
                                         SharedMemoryHandle *new_handle,
                                         bool close_self) {
   *new_handle = 0;
   // TODO(awalker): figure out if we need this, and do the appropriate
   // VM magic if so.
   return false;
 }
 
 
 void SharedMemory::Close() {
-  if (memory_ != NULL) {
-    munmap(memory_, max_size_);
 
-    memory_ = NULL;
-    max_size_ = 0;
-  }
+  Unmap();
 
   std::string posix_name(WideToUTF8(name_));
   if (mapped_file_ > 0) {
     close(mapped_file_);
     shm_unlink(posix_name.c_str());
     mapped_file_ = -1;
   }
 
   if (lock_) {
     posix_name += kSemaphoreSuffix;
     sem_unlink(posix_name.c_str());
     lock_ = NULL;
   }
 }
 
 void SharedMemory::Lock() {
   DCHECK(lock_ != NULL);
   while(sem_wait(lock_) < 0) {
     DCHECK(errno == EAGAIN || errno == EINTR);
   }
 }
 
 void SharedMemory::Unlock() {
   DCHECK(lock_ != NULL);
   int result = sem_post(lock_);
   DCHECK(result == 0);
 }
 
 }  // namespace base