libshmem/lib/libshmem.h

/*----------------------------------------------------------------------------*/
/* libshmem.h                                                                 */
/*----------------------------------------------------------------------------*/

/*----------------------------------------------------------------------------*/
/* This file is part of LibShMem                                              */
/*                                                                            */
/*    LibShMem is free software: you can redistribute it and/or modify it     */
/*    under the terms of the GNU Lesser General Public License as published   */
/*    by the Free Software Foundation, either version 3 of the License, or    */
/*    (at your option) any later version.                                     */
/*                                                                            */
/*    LibShMem is distributed in the hope that it will be useful,             */
/*    but WITHOUT ANY WARRANTY; without even the implied warranty of          */
/*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the            */
/*    GNU Lesser General Public License for more details.                     */
/*                                                                            */
/*    You should have received a copy of the GNU Lesser General Public        */
/*    License along with Drummer. If not, see                                 */
/*    <https://www.gnu.org/licenses/>.                                        */
/*----------------------------------------------------------------------------*/



/*----------------------------------------------------------------------------*/
/* Includes                                                                   */
/*----------------------------------------------------------------------------*/

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

#include <sys/sem.h>
#include <sys/shm.h>
#include <sys/ipc.h>

#include <shmem.h>







/*----------------------------------------------------------------------------*/
/* Definitions                                                                */
/*----------------------------------------------------------------------------*/

#define LGD_MODULE_NAME "sm"



/* Compteur d'ouverture de la librairie */

unsigned int SM_Open_Counter = 0;


/* Flux de sortie des messages d'erreur g<>n<EFBFBD>r<EFBFBD>s par la librairie */

FILE * SM_stderr;

extern char * strdup (const char *);

#define max(A,B)  ((A < B) ? B : A)


/* Limite sup<75>rieure d'adressage */

#define MEM_LIMIT 1000000000


//#define SMD_CMD_VALUE_SUM  (NDT_Command)65
#define NDD_CMD_VALUE_SUM  (NDT_Command)NDD_CMD_USER_TRAVERSE


/* Taille d'un segment = 100 Ko par d<>faut */

#define K 1024
#define NB_BLOCS 100
#define SEGMENT_DEFAULT_SIZE NB_BLOCS * K

char Info_Msg [256];


/* Etats possibles pour un heap */

#define SMD_STATE_VALID         0
#define SMD_STATE_UNVALIDATED   1
#define SMD_STATE_CORRUPTED     2

/* R<>f<EFBFBD>rence sur le heap syst<73>me */

SMT_Heap * System_Heap;

/* Liste des heaps ouverts par le processus courant */

NDT_Root * Opened_Heap_List;



/*
  Taille par d<EFBFBD>faut des chunks allou<EFBFBD>s dans le heap syst<EFBFBD>me :
  Cette taille est fix<EFBFBD>e <EFBFBD> la taille maximale des chunks pouvant
  y <EFBFBD>tre allou<EFBFBD> (de type NDT_Node, NDT_Root, SMT_MHH ou SMT_DSH)
*/

#define DEFAULT_CHUNK_SIZE max(max(sizeof(NDT_Root), sizeof(NDT_Node)), max(sizeof(SMT_MHH), sizeof(SMT_DSH)))

/*
  Nombre de chunk libre minimum avant extension du heap syst<EFBFBD>me par un
  nouveau segment de donn<EFBFBD>es (fix<EFBFBD> <EFBFBD> 3 car l'ajout d'un nouveau segment
  n<EFBFBD>cessite l'allocation de 2 chunks (un noeud et une ent<EFBFBD>te de segment).
*/

#define FREE_CHUNK_LIMIT  3



int SM_Instance;
char * SM_Context;

/* Contexte et instance d'utilisation de la librairie */

#define DEFAULT_INSTANCE        1000
#define INSTANCE_ENV_VAR        "INSTANCE"

#define DEFAULT_CONTEXT         "CTX"
#define CONTEXT_ENV_VAR         "CONTEXT"

/*
  Variable globale permettant d'indiquer que l'on est en train
  d'<EFBFBD>tendre le heap syst<EFBFBD>me par ajout d'un nouveau segment.
*/

unsigned int Adding_Segment = FALSE;

SMT_Chunk * Tmp_Chunk;
SMT_MHH   * Tmp_MHH;

/*
  D<EFBFBD>finition des op<EFBFBD>rations de verouillage et de d<EFBFBD>verrouillage
  NB : la valeur 1 d'un s<EFBFBD>maphore correspond <EFBFBD> l'<EFBFBD>tat non verrouill<EFBFBD>
*/

/* Pose d'un verrou en lecture : 2 op<6F>rations : ( -1 puis +2 ) */

struct sembuf SM_SemOp_SSL [2] = { {0, -1, SEM_UNDO}, {0, 2, SEM_UNDO} };

/* Lib<69>ration d'un verrou en lecture : 2 op<6F>rations ( -2 puis +1 ) */

struct sembuf SM_SemOp_RSL [2] = { {0, -2, SEM_UNDO|IPC_NOWAIT}, {0, 1, SEM_UNDO|IPC_NOWAIT} };

/* Pose d'un verrou en <20>criture : 2 op<6F>rations ( -1 puis 0 ) */

struct sembuf SM_SemOp_SEL [2] = { {0, -1, SEM_UNDO}, {0, 0, SEM_UNDO} };

/* Lib<69>ration d'un verrou en <20>criture : 2 op<6F>rations ( 0 puis +1 ) */

struct sembuf  SM_SemOp_REL [2] = { {0, 0, SEM_UNDO|IPC_NOWAIT}, {0, 1, SEM_UNDO|IPC_NOWAIT} };

/* Transformation d'un verrou en <20>criture en un verrou en lecture : 2 op<6F>rations ( 0 puis +2 ) */

struct sembuf  SM_SemOp_TSL [2] = { {0, 0, SEM_UNDO|IPC_NOWAIT}, {0, 2, SEM_UNDO|IPC_NOWAIT} };

typedef union semun
{
	int                     val;
	struct semid_ds *       buf;
	unsigned short int *    array;
} semun;

/*------------------------------------------------------------------------------*/
/*                                                                              */
/*------------------------------------------------------------------------------*/

#define SM_LIBSHMEM_OPEN_CHECK()  if( !SM_Base) { LG_LOG_ERROR_0( "LibShMem library is not open"); return( SMS_ERRAPI); }
#define SM_HEAP_NAME_CHECK(ptr)   if( !(ptr))   { LG_LOG_ERROR_0( "Heap name is undefined");       return( SMS_ERRAPI); }
#define SM_HEAP_CHECK( ptr)       if( !(ptr))   { LG_LOG_ERROR_0( "Heap is undefined");            return( SMS_ERRAPI); }





/*------------------------------------------------------------------------------*/
/*  Allocation de m<>moire dans la base                                          */
/*------------------------------------------------------------------------------*/

NDT_Status  SM_Base_Alloc( void  **, size_t, void  *);



/*------------------------------------------------------------------------------*/
/*  D<>sallocation de m<>moire dans la base                                       */
/*------------------------------------------------------------------------------*/

NDT_Status  SM_Base_Free( void  *, void  *);



/*------------------------------------------------------------------------------*/
/*  Allocation de m<>moire dans le heap syst<73>me                                  */
/*------------------------------------------------------------------------------*/

NDT_Status SM_System_Alloc( void  **, size_t, void  *);



/*------------------------------------------------------------------------------*/
/*  D<>sallocation de m<>moire dans le heap syst<73>me                               */
/*------------------------------------------------------------------------------*/

NDT_Status SM_System_Free( void  *, void  *);



/*------------------------------------------------------------------------------*/
/*  Initialisation de la base                                                   */
/*------------------------------------------------------------------------------*/

SMT_Status SM_Base_Init (void);



/*------------------------------------------------------------------------------*/
/*  Terminaison de la base                                                      */
/*------------------------------------------------------------------------------*/

SMT_Status SM_Base_End (void);



/*------------------------------------------------------------------------------*/
/*  Ouverture de la base                                                        */
/*------------------------------------------------------------------------------*/

SMT_Status SM_Base_Open (void);



/*------------------------------------------------------------------------------*/
/*  Fermeture de la base                                                        */
/*------------------------------------------------------------------------------*/

SMT_Status SM_Base_Close (void);



/*------------------------------------------------------------------------------*/
/* Pose d'un verrou sur la base :                                               */
/*------------------------------------------------------------------------------*/

SMT_Status SM_Base_Lock (SMT_Flags);



/*------------------------------------------------------------------------------*/
/* Lib<69>ration d'un verrou sur la base :                                         */
/*------------------------------------------------------------------------------*/

SMT_Status SM_Base_Unlock (SMT_Flags);



/*------------------------------------------------------------------------------*/
/* Fonction manager de la liste des heaps ouverts                               */
/*------------------------------------------------------------------------------*/

NDT_Status SM_Opened_Heap_List_Manager ( NDT_Root  *, NDT_Index_Id, NDT_Node  *, NDT_Command, va_list  *);



/*------------------------------------------------------------------------------*/
/* Fonction manager du MHR (Memory Heap Root)                                   */
/*------------------------------------------------------------------------------*/

NDT_Status MHR_Manager( NDT_Root  *, NDT_Index_Id, NDT_Node  *, NDT_Command, va_list  *);



/*------------------------------------------------------------------------------*/
/* Destruction d'un MHH (Memory Heap Header)                                    */
/*------------------------------------------------------------------------------*/

SMT_Status SM_MHH_End (SMT_MHH *);



/*------------------------------------------------------------------------------*/
/* Fonction manager pour un DSR (Data Segment Root)                             */
/*------------------------------------------------------------------------------*/

NDT_Status SM_DSR_Manager( NDT_Root  *, NDT_Index_Id, NDT_Node  *, NDT_Command, va_list  *);



/*------------------------------------------------------------------------------*/
/*  Ouverture d'un segment de donn<6E>es                                           */
/*------------------------------------------------------------------------------*/

SMT_Status SM_DataSegment_Open (SMT_DSH *);



/*------------------------------------------------------------------------------*/
/*  Fermeture d'un segment de donn<6E>es                                           */
/*------------------------------------------------------------------------------*/

SMT_Status SM_DataSegment_Close (SMT_DSH *);



/*------------------------------------------------------------------------------*/
/* Compression d'un segment de donn<6E>es                                          */
/*------------------------------------------------------------------------------*/

size_t SM_DataSegment_Compress (SMT_DSH *, NDT_Root *);



/*------------------------------------------------------------------------------*/
/* Fonction manager pour un ACR (Allocated Chunk Root)                          */
/*------------------------------------------------------------------------------*/

NDT_Status SM_ACR_Manager( NDT_Root  *, NDT_Index_Id, NDT_Node  *, NDT_Command, va_list  *);



/*------------------------------------------------------------------------------*/
/* Fonction manager pour un FCR (Free Chunk Root)                               */
/*------------------------------------------------------------------------------*/

NDT_Status SM_FCR_Manager( NDT_Root  *, NDT_Index_Id, NDT_Node  *, NDT_Command, va_list  *);



/*------------------------------------------------------------------------------*/
/* Pose d'un verrou sur un heap :                                               */
/*------------------------------------------------------------------------------*/

SMT_Status SM_Heap_Lock_Set (SMT_MHH *, SMT_Flags);



/*------------------------------------------------------------------------------*/
/* Changement d'un verrou sur un heap :                                         */
/*------------------------------------------------------------------------------*/

SMT_Status SM_Heap_Lock_Change (SMT_MHH *, SMT_Flags);



/*------------------------------------------------------------------------------*/
/* Lib<69>ration d'un verrou sur un heap :                                         */
/*------------------------------------------------------------------------------*/

SMT_Status SM_Heap_Lock_Release (SMT_MHH *, SMT_Flags);



/*------------------------------------------------------------------------------*/
/* Op<4F>ration sur un s<>maphore                                                   */
/*------------------------------------------------------------------------------*/

SMT_Status SM_Semaphore_Operate (int, struct sembuf *, unsigned int);



/*------------------------------------------------------------------------------*/
/* R<>cup<75>re sous forme explicite l'<27>tat d'un verrou                             */
/*------------------------------------------------------------------------------*/

char * SM_Lock_Status_Get (const char *, void *);



/*------------------------------------------------------------------------------*/
/* Add context prefix to heap name                                              */
/*------------------------------------------------------------------------------*/
/* (O) Prefixed:   Prefixed heap name                                           */
/* (I) Unprefixed: Unprefixed heap name                                         */
/*------------------------------------------------------------------------------*/

SMT_Status  SM_Name_Prefix( char  *, const char  *);







/*------------------------------------------------------------------------------*/