rom/exec/memory.h

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang:
   7 */
   8 #ifndef _MEMORY_H_
   9 #define _MEMORY_H_
  10
  11 #include <exec/lists.h>
  12 #include <exec/semaphores.h>
  13 #include <exec/memory.h>
  14 #include <stddef.h>
  15
  16 /*
  17  * EXPERIMENTAL: use semaphore protection instead of Forbid()/Permit() for
  18  * system memory allocation routines.
  19  * In case of problems use definitions below.
  20  *
  21  * 31.01.2011: disabled, because creates problems:
  22  * 1. FindMem() can be called from within supervisor mode
  23  * 2. FreeMem() can be called from within RemTask() in order to free task structure itself.
  24  *    This eventually leads to trashing memory (semaphore is owned by removed task).
  25  * Can be turned on again only after addressing these issues.
  26
  27 #define MEM_LOCK        ObtainSemaphore(&PrivExecBase(SysBase)->MemListSem)
  28 #define MEM_LOCK_SHARED ObtainSemaphoreShared(&PrivExecBase(SysBase)->MemListSem)
  29 #define MEM_UNLOCK      ReleaseSemaphore(&PrivExecBase(SysBase)->MemListSem)
  30 */
  31 #define MEM_LOCK        Forbid()
  32 #define MEM_LOCK_SHARED Forbid()
  33 #define MEM_UNLOCK      Permit()
  34
  35
  36 /* Private Pool structure */
  37 struct Pool
  38 {
  39     struct MinList PuddleList;
  40     ULONG Requirements;
  41     ULONG PuddleSize;
  42 };
  43
  44 struct ProtectedPool
  45 {
  46     struct Pool            pool;
  47     struct SignalSemaphore sem;
  48 };
  49
  50 struct Block
  51 {
  52     struct MinNode Node;
  53     ULONG Size;
  54 };
  55
  56 struct checkMemHandlersState
  57 {
  58     struct Node           *cmhs_CurNode;
  59     struct MemHandlerData  cmhs_Data;
  60 };
  61
  62 struct MemHeader *FindMem(APTR address, struct ExecBase *SysBase);
  63 APTR stdAlloc(struct MemHeader *mh, IPTR byteSize, ULONG requirements, struct ExecBase *SysBase);
  64 void stdDealloc(struct MemHeader *freeList, APTR memoryBlock, IPTR byteSize, struct ExecBase *SysBase);
  65
  66 APTR InternalAllocAbs(APTR location, IPTR byteSize, struct ExecBase *SysBase);
  67 void InternalFreeMem(APTR location, IPTR byteSize, struct ExecBase *SysBase);
  68 APTR AllocMemHeader(IPTR size, ULONG flags, struct ExecBase *SysBase);
  69 void FreeMemHeader(APTR addr, struct ExecBase *SysBase);
  70
  71 APTR InternalAllocPooled(APTR poolHeader, IPTR memSize, ULONG flags, const char *function, APTR caller, struct ExecBase *SysBase);
  72 void InternalFreePooled(APTR memory, IPTR memSize, const char *function, APTR caller, APTR stack, struct ExecBase *SysBase);
  73
  74 ULONG checkMemHandlers(struct checkMemHandlersState *cmhs, struct ExecBase *SysBase);
  75
  76 APTR nommu_AllocMem(IPTR byteSize, ULONG flags, struct ExecBase *SysBase);
  77 APTR nommu_AllocAbs(APTR location, IPTR byteSize, struct ExecBase *SysBase);
  78 void nommu_FreeMem(APTR memoryBlock, IPTR byteSize, struct ExecBase *SysBase);
  79 IPTR nommu_AvailMem(ULONG attributes, struct ExecBase *SysBase);
  80
  81 #define BLOCK_TOTAL \
  82 ((sizeof(struct Block)+AROS_WORSTALIGN-1)&~(AROS_WORSTALIGN-1))
  83
  84 #endif