libsxmp/include/sntl/mcache.h

#ifndef __MCACHE_H__
#define	__MCACHE_H__

#include <stdint.h>
#include <time.h>
#include <sys/types.h>
#include <pthread.h>

#include <tdata/usrtc.h>
#include <tdata/idx_allocator.h>

#define _MCACHE_MAGIC  0xabcdbeef
#define _MPG_SIZE      4096

#define _MCACHE_EMINSIZE  sizeof(unsigned long) + 8
#define _MCACHE_EMAXSIZE  sizeof(unsigned long) + 224

#define _MCACHE_PREALLOC    (1 << 1)  /* preallocate elements on initialization */
#define _MCACHE_ALLOCAHEAD  (1 << 2)  /* allocate more ahead */
#define _MCACHE_MEMFREE     (1 << 3)  /* free as possible */

/* this structure used to store info on page, and located
 * at the beginning of the allocated page
 */
struct _mpg {
  void *addr;
  unsigned int use;
  usrtc_node_t node;
} __attribute__((packed));

typedef struct __sntl_mcache_ {
  unsigned int magic; /** < first 32bit to check it */
  usrtc_t pg_tree;    /** < pages tree */
  size_t esize;       /** < element size*/
  pthread_rwlock_t lock;  /** < thread safe cap */
  usrtc_t allocated;  /** < allocated elements to increase allocation */
  usrtc_t used;       /** < used ones */
  unsigned int epc;   /** < elements per cache page */
  int flags;          /** < flags of the cache */
} sntl_mcache_t;

int sntl_mcache_init(sntl_mcache_t*, size_t, int);

void* sntl_mcache_alloc(sntl_mcache_t*);

void sntl_mcache_free(void*);

void sntl_mcache_destroy(sntl_mcache_t*);

#endif /* __MCACHE_H__ */