Source

daybothreads / atomscalar.c

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/*
Daybo Logic Threads Abstraction Library
Copyright (C) 2001-2006 Daybo Logic.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. Neither the name of the project nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
/*
  This module provides the code neccersary to protect a shared scalar
  between threads with a mutual exclusion mechanism, called a mutex
  or a dtstical section.

  - DDRP <daybologic.co.uk/mailddrp>
  http://www.daybologic.co.uk/dev/daybothreads/
*/

#define DAYBOTHREADS_SOURCE
#define DAYBOTHREADS_ATOMSCALAR_SOURCE

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif /*HAVE_CONFIG_H*/

#include <assert.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <time.h>

#if defined(DAYBOTHREADS_NT)
# include <windows.h>
#elif defined(DAYBOTHREADS_PTH)
# include <pth.h>
#else
# include <pthread.h>
# include <errno.h>
#endif /*DAYBOTHREADS_NT*/

#ifdef HDRSTOP
# pragma hdrstop
#endif /*HDRSTOP*/

#include "dlstdinc.h" /* My types */
#include "daybothreads.h" /* Public header */
/*-------------------------------------------------------------------------*/
#ifdef OVERCHAT_RCS_STAMPS
static const char *rcsid =
  "$Id: atomscalar.c,v 0.7 2006/02/10 12:00:00 ddrp Exp $";
#endif /*OVERCHAT_RCS_STAMPS*/

static enum daybothreads_scalarType Link_DetermineType(
  struct daybothreads_scalar *PObject
);

static void Link_Increment(
  struct daybothreads_scalar *PObject
);

static void Link_Decrement(
  struct daybothreads_scalar *PObject
);

static void Link_IncrementBy(
  struct daybothreads_scalar *PObject,
  const unsigned long Amount
);

static void Link_DecrementBy(
  struct daybothreads_scalar *PObject,
  const unsigned long Amount
);

static signed short int Link_SS(
  struct daybothreads_scalar *PObject,
  const signed short int *PNew
);

static unsigned short int Link_US(
  struct daybothreads_scalar *PObject,
  const unsigned short int *PNew
);

static signed int Link_SI(
  struct daybothreads_scalar *PObject,
  const signed int *PNew
);

static unsigned int Link_UI(
  struct daybothreads_scalar *PObject,
  const unsigned int *PNew
);

static signed long int Link_SL(
  struct daybothreads_scalar *PObject,
  const signed long int *PNew
);

static unsigned long int Link_UL(
  struct daybothreads_scalar *PObject,
  const unsigned long int *PNew
);

static char Link_C(
  struct daybothreads_scalar *PObject,
  const char *PNew
);

static signed char Link_SC(
  struct daybothreads_scalar *PObject,
  const signed char *PNew
);

static unsigned char Link_UC(
  struct daybothreads_scalar *PObject,
  const unsigned char *PNew
);

static signed short int Link_GetSignedShort(
  struct daybothreads_scalar *PObject
);

static unsigned short int Link_GetUnsignedShort(
  struct daybothreads_scalar *PObject
);

static signed int Link_GetSignedInt(
  struct daybothreads_scalar *PObject
);

static unsigned int Link_GetUnsignedInt(
  struct daybothreads_scalar *PObject
);

static signed long int Link_GetSignedLong(
  struct daybothreads_scalar *PObject
);

static unsigned long int Link_GetUnsignedLong(
  struct daybothreads_scalar *PObject
);

static char Link_GetChar(
  struct daybothreads_scalar *PObject
);

static signed char Link_GetSignedChar(
  struct daybothreads_scalar *PObject
);

static unsigned char Link_GetUnsignedChar(
  struct daybothreads_scalar *PObject
);

static signed short int Link_SetSignedShort(
  struct daybothreads_scalar *PObject,
  const signed short int New
);

static unsigned short int Link_SetUnsignedShort(
  struct daybothreads_scalar *PObject,
  const unsigned short int New
);

static signed int Link_SetSignedInt(
  struct daybothreads_scalar *PObject,
  const signed int New
);

static unsigned int Link_SetUnsignedInt(
  struct daybothreads_scalar *PObject,
  const unsigned int New
);

static signed long int Link_SetSignedLong(
  struct daybothreads_scalar *PObject,
  const signed long int New
);

static unsigned long int Link_SetUnsignedLong(
  struct daybothreads_scalar *PObject,
  const unsigned long int New
);

static char Link_SetChar(
  struct daybothreads_scalar *PObject,
  const char New
);

static signed char Link_SetSignedChar(
  struct daybothreads_scalar *PObject,
  const signed char New
);

static unsigned char Link_SetUnsignedChar(
  struct daybothreads_scalar *PObject,
  const unsigned char New
);
/*-------------------------------------------------------------------------*/
static enum daybothreads_scalarType Link_DetermineType(
  struct daybothreads_scalar *PObject
)
{
  enum daybothreads_scalarType type = dtstUnknown;

  if ( PObject ) {
    EnterLock(&PObject->Lock);
    type = PObject->Type;
    LeaveLock(&PObject->Lock);
  }

  return type;
}
/*-------------------------------------------------------------------------*/
static void Link_Increment(
  struct daybothreads_scalar *PObject
)
{
  Link_IncrementBy(PObject, 1);
}
/*-------------------------------------------------------------------------*/
static void Link_Decrement(
  struct daybothreads_scalar *PObject
)
{
  Link_DecrementBy(PObject, 1);
}
/*-------------------------------------------------------------------------*/
static void Link_IncrementBy(
  struct daybothreads_scalar *PObject,
  const unsigned long Amount
)
{
  /* Interlocked increment */
  if ( PObject ) {
    EnterLock(&PObject->Lock);
    switch ( PObject->Type ) {
      case dtstIntSignedShort : {
        PObject->Scalar.ss += (signed short)Amount;
        break;
      }
      case dtstIntUnsignedShort : {
        PObject->Scalar.us += (unsigned short)Amount;
        break;
      }
      case dtstIntSigned : {
        PObject->Scalar.si += (signed int)Amount;
        break;
      }
      case dtstIntUnsigned : {
        PObject->Scalar.ui += (unsigned int)Amount;
        break;
      }
      case dtstIntSignedLong : {
        PObject->Scalar.sl += (signed long)Amount;
        break;
      }
      case dtstIntUnsignedLong : {
        PObject->Scalar.ul += Amount;
        break;
      }
      case dtstChar : {
        PObject->Scalar.c += Amount;
        break;
      }
      case dtstSignedChar : {
        PObject->Scalar.sc += Amount;
        break;
      }
      case dtstUnsignedChar : {
        PObject->Scalar.uc += Amount;
        break;
      }
      default : {
        assert(0);
      }
    }
    LeaveLock(&PObject->Lock);
  }
  return;
}
/*-------------------------------------------------------------------------*/
static void Link_DecrementBy(
  struct daybothreads_scalar *PObject,
  const unsigned long Amount
)
{
  /* Interlocked decrement */
  if ( PObject ) {
    EnterLock(&PObject->Lock);
    switch ( PObject->Type ) {
      case dtstIntSignedShort : {
        PObject->Scalar.ss -= (signed short)Amount;
        break;
      }
      case dtstIntUnsignedShort : {
        PObject->Scalar.us -= (unsigned short)Amount;
        break;
      }
      case dtstIntSigned : {
        PObject->Scalar.si -= (signed int)Amount;
        break;
      }
      case dtstIntUnsigned : {
        PObject->Scalar.ui -= (unsigned int)Amount;
        break;
      }
      case dtstIntSignedLong : {
        PObject->Scalar.sl -= (signed long)Amount;
        break;
      }
      case dtstIntUnsignedLong : {
        PObject->Scalar.ul -= Amount;
        break;
      }
      case dtstChar : {
        PObject->Scalar.c -= Amount;
        break;
      }
      case dtstSignedChar : {
        PObject->Scalar.sc -= Amount;
        break;
      }
      case dtstUnsignedChar : {
        PObject->Scalar.uc -= Amount;
        break;
      }
      default : {
        assert(0);
      }
    }
    LeaveLock(&PObject->Lock);
  }
  return;
}
/*-------------------------------------------------------------------------*/
static signed short int Link_SS(
  struct daybothreads_scalar *PObject,
  const signed short int *PNew
)
{
  signed short int oldSS = (signed short int)0;

  EnterLock(&PObject->Lock);
  /* GET */
  if ( PObject->Type == dtstIntSignedShort ) /* Must be the right type */
    oldSS = PObject->Scalar.ss;
  /* SET */
  if ( PNew ) {
    PObject->Type = dtstIntSignedShort; /* Set type */
    PObject->Scalar.ss = *PNew; /* Store */
  }
  LeaveLock(&PObject->Lock);
  return oldSS;
}
/*-------------------------------------------------------------------------*/
static unsigned short int Link_US(
  struct daybothreads_scalar *PObject,
  const unsigned short int *PNew
)
{
  unsigned short int oldUS = (unsigned short int)0;

  EnterLock(&PObject->Lock);
  /* GET */
  if ( PObject->Type == dtstIntUnsignedShort ) /* Must be the right type */
    oldUS = PObject->Scalar.us;
  /* SET */
  if ( PNew ) {
    PObject->Type = dtstIntUnsignedShort; /* Set type */
    PObject->Scalar.us = *PNew; /* Store */
  }
  LeaveLock(&PObject->Lock);
  return oldUS;
}
/*-------------------------------------------------------------------------*/
static signed int Link_SI(
  struct daybothreads_scalar *PObject,
  const signed int *PNew
)
{
  signed int oldSI = 0;

  EnterLock(&PObject->Lock);
  /* GET */
  if ( PObject->Type == dtstIntSigned ) /* Must be the right type */
    oldSI = PObject->Scalar.si;
  /* SET */
  if ( PNew ) {
    PObject->Type = dtstIntSigned; /* Set type */
    PObject->Scalar.si = *PNew; /* Store */
  }
  LeaveLock(&PObject->Lock);
  return oldSI;
}
/*-------------------------------------------------------------------------*/
static unsigned int Link_UI(
  struct daybothreads_scalar *PObject,
  const unsigned int *PNew
)
{
  unsigned int oldUI = (unsigned int)0;

  EnterLock(&PObject->Lock);
  /* GET */
  if ( PObject->Type == dtstIntUnsigned ) /* Must be the right type */
    oldUI = PObject->Scalar.ui;
  /* SET */
  if ( PNew ) {
    PObject->Type = dtstIntUnsigned; /* Set type */
    PObject->Scalar.ui = *PNew; /* Store */
  }
  LeaveLock(&PObject->Lock);
  return oldUI;
}
/*-------------------------------------------------------------------------*/
static signed long int Link_SL(
  struct daybothreads_scalar *PObject,
  const signed long int *PNew
)
{
  signed long int oldSL = (signed long int)0;

  EnterLock(&PObject->Lock);
  /* GET */
  if ( PObject->Type == dtstIntSignedLong ) /* Must be the right type */
    oldSL = PObject->Scalar.sl;
  /* SET */
  if ( PNew ) {
    PObject->Type = dtstIntSignedLong; /* Set type */
    PObject->Scalar.sl = *PNew; /* Store */
  }
  LeaveLock(&PObject->Lock);
  return oldSL;
}
/*-------------------------------------------------------------------------*/
static unsigned long int Link_UL(
  struct daybothreads_scalar *PObject,
  const unsigned long int *PNew
)
{
  unsigned long int oldUL = (unsigned long int)0;

  EnterLock(&PObject->Lock);
  /* GET */
  if ( PObject->Type == dtstIntUnsignedLong ) /* Must be the right type */
    oldUL = PObject->Scalar.ul;
  /* SET */
  if ( PNew ) {
    PObject->Type = dtstIntUnsignedLong; /* Set type */
    PObject->Scalar.ul = *PNew; /* Store */
  }
  LeaveLock(&PObject->Lock);
  return oldUL;
}
/*-------------------------------------------------------------------------*/
static char Link_C(
  struct daybothreads_scalar *PObject,
  const char *PNew
)
{
  char oldC = (char)0;

  EnterLock(&PObject->Lock);
  /* GET */
  if ( PObject->Type == dtstChar ) /* Must be the right type */
    oldC = PObject->Scalar.c;
  /* SET */
  if ( PNew ) {
    PObject->Type = dtstChar; /* Set type */
    PObject->Scalar.c = *PNew; /* Store */
  }
  LeaveLock(&PObject->Lock);
  return oldC;
}
/*-------------------------------------------------------------------------*/
static signed char Link_SC(
  struct daybothreads_scalar *PObject,
  const signed char *PNew
)
{
  signed char oldSC = (signed char)0;

  EnterLock(&PObject->Lock);
  /* GET */
  if ( PObject->Type == dtstSignedChar ) /* Must be the righr type */
    oldSC = PObject->Scalar.sc;
  /* SET */
  if ( PNew ) {
    PObject->Type = dtstSignedChar; /* Set type */
    PObject->Scalar.sc = *PNew; /* Store */
  }
  LeaveLock(&PObject->Lock);
  return oldSC;
}
/*-------------------------------------------------------------------------*/
static unsigned char Link_UC(
  struct daybothreads_scalar *PObject,
  const unsigned char *PNew
)
{
  unsigned char oldUC = (unsigned char)0;

  EnterLock(&PObject->Lock);
  /* GET */
  if ( PObject->Type == dtstUnsignedChar ) /* Must be the right type */
    oldUC = PObject->Scalar.uc;
  /* SET */
  if ( PNew ) {
    PObject->Type = dtstUnsignedChar; /* Set type */
    PObject->Scalar.uc = *PNew; /* Store */
  }
  LeaveLock(&PObject->Lock);
  return oldUC;
}
/*-------------------------------------------------------------------------*/
static signed short int Link_GetSignedShort(
  struct daybothreads_scalar *PObject
)
{
  return Link_SS(PObject, NULL);
}
/*-------------------------------------------------------------------------*/
static unsigned short int Link_GetUnsignedShort(
  struct daybothreads_scalar *PObject
)
{
  return Link_US(PObject, NULL);
}
/*-------------------------------------------------------------------------*/
static signed int Link_GetSignedInt(
  struct daybothreads_scalar *PObject
)
{
  return Link_SI(PObject, NULL);
}
/*-------------------------------------------------------------------------*/
static unsigned int Link_GetUnsignedInt(
  struct daybothreads_scalar *PObject
)
{
  return Link_UI(PObject, NULL);
}
/*-------------------------------------------------------------------------*/
static signed long int Link_GetSignedLong(
  struct daybothreads_scalar *PObject
)
{
  return Link_SL(PObject, NULL);
}
/*-------------------------------------------------------------------------*/
static unsigned long int Link_GetUnsignedLong(
  struct daybothreads_scalar *PObject
)
{
  return Link_UL(PObject, NULL);
}
/*-------------------------------------------------------------------------*/
static char Link_GetChar(
  struct daybothreads_scalar *PObject
)
{
  return Link_C(PObject, NULL);
}
/*-------------------------------------------------------------------------*/
static signed char Link_GetSignedChar(
  struct daybothreads_scalar *PObject
)
{
  return Link_SC(PObject, NULL);
}
/*-------------------------------------------------------------------------*/
static unsigned char Link_GetUnsignedChar(
  struct daybothreads_scalar *PObject
)
{
  return Link_UC(PObject, NULL);
}
/*-------------------------------------------------------------------------*/
static signed short int Link_SetSignedShort(
  struct daybothreads_scalar *PObject,
  const signed short int New
)
{
  return Link_SS(PObject, &New);
}
/*-------------------------------------------------------------------------*/
static unsigned short int Link_SetUnsignedShort(
  struct daybothreads_scalar *PObject,
  const unsigned short int New
)
{
  return Link_US(PObject, &New);
}
/*-------------------------------------------------------------------------*/
static signed int Link_SetSignedInt(
  struct daybothreads_scalar *PObject,
  const signed int New
)
{
  return Link_SI(PObject, &New);
}
/*-------------------------------------------------------------------------*/
static unsigned int Link_SetUnsignedInt(
  struct daybothreads_scalar *PObject,
  const unsigned int New
)
{
  return Link_UI(PObject, &New);
}
/*-------------------------------------------------------------------------*/
static signed long int Link_SetSignedLong(
  struct daybothreads_scalar *PObject,
  const signed long int New
)
{
  return Link_SL(PObject, &New);
}
/*-------------------------------------------------------------------------*/
static unsigned long int Link_SetUnsignedLong(
  struct daybothreads_scalar *PObject,
  const unsigned long int New
)
{
  return Link_UL(PObject, &New);
}
/*-------------------------------------------------------------------------*/
static char Link_SetChar(
  struct daybothreads_scalar *PObject,
  const char New
)
{
  return Link_C(PObject, &New);
}
/*-------------------------------------------------------------------------*/
static signed char Link_SetSignedChar(
  struct daybothreads_scalar *PObject,
  const signed char New
)
{
  return Link_SC(PObject, &New);
}
/*-------------------------------------------------------------------------*/
static unsigned char Link_SetUnsignedChar(
  struct daybothreads_scalar *PObject,
  const unsigned char New
)
{
  return Link_UC(PObject, &New);
}
/*-------------------------------------------------------------------------*/
DAYBOTHREADS_API(void) daybothreads_CreateAtomicScalar(
  struct daybothreads_scalar *PAtomicScalar
)
{
  if ( PAtomicScalar ) {
    /* VTABLE linkage */
    PAtomicScalar->DetermineType = Link_DetermineType;
    PAtomicScalar->Increment = Link_Increment;
    PAtomicScalar->Decrement = Link_Decrement;
    PAtomicScalar->IncrementBy = Link_IncrementBy;
    PAtomicScalar->DecrementBy = Link_DecrementBy;
    PAtomicScalar->SS = Link_SS;
    PAtomicScalar->US = Link_US;
    PAtomicScalar->SI = Link_SI;
    PAtomicScalar->UI = Link_UI;
    PAtomicScalar->SL = Link_SL;
    PAtomicScalar->UL = Link_UL;
    PAtomicScalar->C = Link_C;
    PAtomicScalar->SC = Link_SC;
    PAtomicScalar->UC = Link_UC;

    PAtomicScalar->GetSignedShort = Link_GetSignedShort;
    PAtomicScalar->GetUnsignedShort = Link_GetUnsignedShort;
    PAtomicScalar->GetSignedInt = Link_GetSignedInt;
    PAtomicScalar->GetUnsignedInt = Link_GetUnsignedInt;
    PAtomicScalar->GetSignedLong = Link_GetSignedLong;
    PAtomicScalar->GetUnsignedLong = Link_GetUnsignedLong;
    PAtomicScalar->GetChar = Link_GetChar;
    PAtomicScalar->GetSignedChar = Link_GetSignedChar;
    PAtomicScalar->GetUnsignedChar = Link_GetUnsignedChar;

    PAtomicScalar->SetSignedShort = Link_SetSignedShort;
    PAtomicScalar->SetUnsignedShort = Link_SetUnsignedShort;
    PAtomicScalar->SetSignedInt = Link_SetSignedInt;
    PAtomicScalar->SetUnsignedInt = Link_SetUnsignedInt;
    PAtomicScalar->SetSignedLong = Link_SetSignedLong;
    PAtomicScalar->SetUnsignedLong = Link_SetUnsignedLong;
    PAtomicScalar->SetChar = Link_SetChar;
    PAtomicScalar->SetSignedChar = Link_SetSignedChar;
    PAtomicScalar->SetUnsignedChar = Link_SetUnsignedChar;

   /* Data init */
   PAtomicScalar->Type = dtstIntSigned;
   PAtomicScalar->Scalar.si = 0;
   CreateLock(&PAtomicScalar->Lock);
  }
}
/*-------------------------------------------------------------------------*/
DAYBOTHREADS_API(void) daybothreads_DestroyAtomicScalar(
  struct daybothreads_scalar *PAtomicScalar
)
{
  DestroyLock(&PAtomicScalar->Lock);
}
/*-------------------------------------------------------------------------*/