Made mempool.c threadsafe (#234)

src/mempool.h

@@ -3,41 +3,17 @@
 **
 **  Header for mempool.c
 **
-**  The type alloc_handle_t provides an opaque reference to the
-**  alloc pool - only the alloc routines know its structure.
+**  A simple pooled memory allocator
 */
 
 #ifndef MEMPOOL_H
 #define MEMPOOL_H
 
-#ifndef DLLEXPORT
-  #ifdef DLL
-    #ifdef __cplusplus
-    #define DLLEXPORT extern "C" __declspec(dllexport)
-    #else
-    #define DLLEXPORT __declspec(dllexport) __stdcall
-    #endif
-  #elif defined(CYGWIN)
-    #define DLLEXPORT __stdcall
-  #else
-    #ifdef __cplusplus
-    #define DLLEXPORT
-    #else
-    #define DLLEXPORT
-    #endif
-  #endif
-#endif
+struct Mempool;
 
-
-typedef struct
-{
-   long  dummy;
-}  alloc_handle_t;
-
-alloc_handle_t *AllocInit(void);
-char           *Alloc(long);
-alloc_handle_t *AllocSetPool(alloc_handle_t *);
-void            AllocReset(void);
-void            AllocFreePool(void);
+struct Mempool * mempool_create();
+void   mempool_delete(struct Mempool *mempool);
+void   mempool_reset(struct Mempool *mempool);
+char * mempool_alloc(struct Mempool *mempool, size_t size);
 
 #endif