fdi_mutx.c

Flash file system

/* ###########################################################################
###  Intel Confidential
###  Copyright (c) Intel Corporation 1995-2002
###  All Rights Reserved.
###  -------------------------------------------------------------------------
###  Project: Flash Data Integrator
###
###  Module: Mutex.c - This file impliments a VXWorks like mutex semaphore
###                    using binary semaphores.
###
###  $Archive: /FDI/SRC/FDI/fdi_mutx.c $
###  $Revision: 1.1 $
###  $Date: 2002/11/21 00:48:21 $
###  $Author: wavis $
###  $NoKeywords $
########################################################################### */

/****************************************************************************
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Revised: 02/16/01
***************************************************************************/

#include "fdi_type.h"
#include "fdi_que.h"

#ifdef CUSTOM_SEM_MTX
/*#define DEBUG_MTX*/             /* uncomment this to have logmsg's printed */
#ifdef DEBUG_MTX
#include "logLib.h"
#endif
#ifdef TEST_MSGS
#include "logLib.h"
#endif
/*
#define  MAX_QUEUE_ITEMS      ( (FDI_QUEUE_SIZE - sizeof(Q_DESCRIPTOR) - \
                                                  sizeof(Q_PRIORITY_HEADER)) /\
                                                 (sizeof(COMMAND) + \
                                                  sizeof(Q_ITEM_INFO)) )
*/
#define MAX_QUEUE_ITEMS ( (sizeof(Q_PRIORITY_HEADER) < (sizeof(COMMAND) + \
                         sizeof(Q_ITEM_INFO))) ? \
    ((((FDI_QUEUE_SIZE - sizeof(Q_DESCRIPTOR)) / \
                        (sizeof(Q_PRIORITY_HEADER) + \
                         sizeof(COMMAND) + \
                         sizeof(Q_ITEM_INFO))) * \
                         2) + \
                         2) : \
      ((FDI_QUEUE_SIZE - sizeof(Q_DESCRIPTOR) - \
                         sizeof(Q_PRIORITY_HEADER)) / \
                        (sizeof(COMMAND) + \
                         sizeof(Q_ITEM_INFO)) + \
                         3) )

#define MAX_MTX_ID       (Q_STATIC_SEM_CNT+MAX_QUEUE_ITEMS+1)
DWORD   Max_Mtx_Id = MAX_MTX_ID;

extern  SEM_MTX_ID  Sem_Mtx_Create(void);
extern  ERR_CODE Sem_Mtx_Destroy(SEM_MTX_ID  semId);
extern  ERR_CODE Sem_Mtx_Post(SEM_MTX_ID  semId);
extern  ERR_CODE Sem_Mtx_Try_Wait(SEM_MTX_ID  semId);
extern  ERR_CODE Sem_Mtx_Wait(SEM_MTX_ID  semId);
SEM_MTX Mtx_Array[MAX_MTX_ID];
SEM_ID  SEM_Mutex_Space;

/*
########################################################################
### Sem_Mtx_Init()
###
### DESCRIPTION:   Inits. the Mutex data space and control semaphore.
###
### PARAMETERS:
###    IN:         None.
###    OUT:        None.
###
### RETURNS:       None.
###
*/
ERR_CODE
Sem_Mtx_Init(void)
{
   WORD cnt;
#ifdef DEBUG_MTX
   logMsg("Init Sem!\n", 0, 0, 0, 0, 0, 0);
#endif
   /* Initialize Mtx_Array structure */
   for (cnt = 0; cnt < MAX_MTX_ID; cnt++)
   {
      Mtx_Array[cnt].current_task_id = 0;
      Mtx_Array[cnt].wait_count = 0;
#if(SEM_CREATE_DESTROY == TRUE)
      Mtx_Array[cnt].binary_sem = 0;
#endif /* SEM_CREATE_DESTROY */
      Mtx_Array[cnt].used = 0;
   }
   /* Create SEM_Mutex_Space, verify it exists, and post it */
#if(SEM_CREATE_DESTROY == TRUE)
   if((SEM_Mutex_Space = SEM_BIN_CREATE()) == SEM_NULL)
#else /* SEM_CREATE_DESTROY */
   if(SEM_Mutex_Space == SEM_NULL)
#endif /* SEM_CREATE_DESTROY */
      return(ERR_INIT);
   SEM_POST(SEM_Mutex_Space);
   return(ERR_NONE);
}

/*
########################################################################
### Sem_Mtx_Create()
###
### DESCRIPTION:  Creates a Mutex semaphore using a binary Semaphore.
###
### PARAMETERS:
###    IN:        none.
###    OUT:       none.
###
### RETURNS:      Pointer to Mutex Semaphore Structure SEM_MTX or Null.
###
*/