Merge google-perftools r109 (the current contents of third_party/tcmalloc/vendor)

third_party/tcmalloc/chromium/src/central_freelist.h

 // Copyright (c) 2008, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 16 matching lines @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // ---
 // Author: Sanjay Ghemawat <opensource@google.com>
 
 #ifndef TCMALLOC_CENTRAL_FREELIST_H_
 #define TCMALLOC_CENTRAL_FREELIST_H_
 
 #include "config.h"
+#include <stddef.h>                     // for size_t
+#ifdef HAVE_STDINT_H
+#include <stdint.h>                     // for int32_t
+#endif
+#include "base/spinlock.h"
 #include "base/thread_annotations.h"
-#include "base/spinlock.h"
 #include "common.h"
 #include "span.h"
 
 namespace tcmalloc {
 
 // Data kept per size-class in central cache.
 class CentralFreeList {
  public:
   void Init(size_t cl);
 
@@ skipping 22 matching lines @@
   struct TCEntry {
     void *head;  // Head of chain of objects.
     void *tail;  // Tail of chain of objects.
   };
 
   // A central cache freelist can have anywhere from 0 to kNumTransferEntries
   // slots to put link list chains into.  To keep memory usage bounded the total
   // number of TCEntries across size classes is fixed.  Currently each size
   // class is initially given one TCEntry which also means that the maximum any
   // one class can have is kNumClasses.
+#ifdef TCMALLOC_SMALL_BUT_SLOW
+  // For the small memory model, the transfer cache is not used.
+  static const int kNumTransferEntries = 0;
+#else
   static const int kNumTransferEntries = kNumClasses;
+#endif
 
   // REQUIRES: lock_ is held
   // Remove object from cache and return.
   // Return NULL if no free entries in cache.
   void* FetchFromSpans() EXCLUSIVE_LOCKS_REQUIRED(lock_);
 
   // REQUIRES: lock_ is held
   // Remove object from cache and return.  Fetches
   // from pageheap if cache is empty.  Only returns
   // NULL on allocation failure.
@@ skipping 74 matching lines @@
 class CentralFreeListPaddedTo<0> : public CentralFreeList {
 };
 
 class CentralFreeListPadded : public CentralFreeListPaddedTo<
   sizeof(CentralFreeList) % 64> {
 };
 
 }  // namespace tcmalloc
 
 #endif  // TCMALLOC_CENTRAL_FREELIST_H_