From:	Peter Danielsson <e96pd AT efd DOT lth DOT se>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: DPMI memory allocation 2
Date:	Thu, 04 Nov 1999 01:39:59 +0100
Organization:	Student
Lines:	174
Message-ID:	<3820D5DE.F8CC1C77@efd.lth.se>
References:	<3821E566 DOT 15FB AT radar DOT mcgill DOT ca> <3821FDFA DOT 59E2 AT radar DOT mcgill DOT ca>
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To:	djgpp AT delorie DOT com
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Perheps your interupt function try to change the memory while writing to disk. This may cause problem.

/Peter

Frederic Cazenave wrote:

> Hi,
>
> In fact I have cornered more my problem :
> The problen is beetween the interrupt and the write.
> The two parts work fine separately but most of the
> time when I try to write while some interrupts are
> treated my system crashes.
> I give you the code of my interrupt. If someone could
> show me the problem ...
>
> iqbuff is created by a malloc on 90% off the free
> pages of my system.
>
> Thanks
>
> FRed
>
> --
>  _________________________________________________________
> |                                                          |
> |               Frederic CAZENAVE                          |
> |    _/\_  /^=  McGill Radar                               |
> | \_/    \//    Box 198, MacDonald College                 |
> |   | /-\ |     Ste Anne de Bellevue                       |
> |   ||   ||     Quebec, Canada   H9X 3V9                   |
> |               Tel (514) 398 7733 fax (514) 398 7755      |
> |               mailto:Frederic DOT Cazenave AT hmg DOT inpg DOT fr       |
> |               http://www.mpl.orstom.fr/hydrologie/catch/ |
> |__________________________________________________________|
>
>   ------------------------------------------------------------------------
> #include        <stdio.h>
> #include        <ctype.h>
> #include        <string.h>
>
> #include        <go32.h>
> #include        <dpmi.h>
>
> #include        "..\include\globals.h"
>
> #define LOCK_VAR(x) _go32_dpmi_lock_code((void *)&x,(long)sizeof(x));
> #define NHITS  7
>
> extern int pos_prod;
>
> typedef struct tabiq {
>         float IQ[2][1024*NHITS];
> } TABIQ;
>
> extern TABIQ * buffiq;
> extern int numhits;
>
> int     Intnum;
> static   int    * gates;
> static   int    * flag;
> static   PIRAQ  *diraq;
> static   int    * xstart;
> static   int    * xstop;
>
> static int *Ack;
>
> unsigned short Reg_base;
>
> void piraq_int_off(void);
> void piraq_int_on(CONFIG * config, PIRAQ * piraq);
> void piraq_isr(void);
> static void IntDirac (void);
> static void End_IntDirac(void);
>
> int     Irqmask;
>
> /* declare an arrays for the info on all the interrupts */
> _go32_dpmi_seginfo      Piraq_isr;
>
> void piraq_int_off(void)
>    {
>    int  intnum;
>
>    if(Intnum < 8)
>       outp(0x21,inp(0x21)|Irqmask);        /* clear master PIC */
>    else
>       outp(0xA1,inp(0xA1)|Irqmask);        /* clear slave PIC */
>
>    _go32_dpmi_free_iret_wrapper(&Piraq_isr);
>    }
>
> static  int     Firstime=1;
> void piraq_int_on(CONFIG * config, PIRAQ * piraq)
>    {
>    if(Firstime) /* register the cleanup routine */
>       {
>       Firstime = 0;
>       atexit(piraq_int_off);
>       }
>    Ack = (int *)config->intack;
>    diraq = piraq;
>    flag = (int *) piraq->flag;
>    gates = &config->gates;
>    xstart = &config->first_g;
>    xstop = &config->last_g;
>    _go32_dpmi_lock_code(IntDirac,(unsigned long)(IntDirac - End_IntDirac));
>    _go32_dpmi_lock_data(&Intnum,sizeof(int));
>    _go32_dpmi_lock_data(&pos_prod,sizeof(int));
>    _go32_dpmi_lock_data(diraq,sizeof(PIRAQ));
>    _go32_dpmi_lock_data(gates,sizeof(int));
>    _go32_dpmi_lock_data(xstart,sizeof(int));
>    _go32_dpmi_lock_data(xstop,sizeof(int));
>    _go32_dpmi_lock_data(Ack,sizeof(int));
>    Intnum = pci(0x3C) & 0xFF;
>
>    /* calculate irq mask bit for PIC */
>    Piraq_isr.pm_offset = (int)(IntDirac);
>    Piraq_isr.pm_selector = _go32_my_cs();
>    _go32_dpmi_allocate_iret_wrapper(&Piraq_isr);
>    if(Intnum < 8)
>       {
>       Irqmask = 1 << Intnum;
>       outp(0x21,inp(0x21)&~Irqmask); /* enable PC IRQ on master */
>       _go32_dpmi_set_protected_mode_interrupt_vector(Intnum+8,&Piraq_isr); /* hardware irq0 is int 8 */
>       }
>    else
>       {
>       Irqmask = 1 << (Intnum - 8);
>       outp(0xA1,inp(0xA1)&~Irqmask); /* enable PC IRQ on slave */
>       _go32_dpmi_set_protected_mode_interrupt_vector(Intnum+0x68,&Piraq_isr); /* hardware irq0 is int 8 */
>       }
>    }
>
> static void IntDirac (void)
> {
>    float *dualram[2],*iqbuff[2],*ram;
>    int i,j;
>   float tmp;
>
> //   disable();
>    dualram[0] = diraq->bufptr[ *(diraq->flag) & 1];
>    dualram[1] = dualram[0] + 0x4000;
>    iqbuff[0] = (float *)(TABIQ *)(buffiq+pos_prod)->IQ[0];
>    iqbuff[1] = (float *)(TABIQ *)(buffiq+pos_prod)->IQ[1];
>
>    for (j=0;j<NHITS;j++){
>            *iqbuff[0]++ = *(float *)(dualram[0]+j**gates);   // Gate0 I
>            *iqbuff[0]++ = *(float *)(dualram[0]+j**gates+1); // Gate0 Q
>            ram = (float *)(dualram[0]+j**gates+*xstart);
>            for (i=0;i< *xstop-*xstart;i++)
>                 *iqbuff[0]++ = *(float *)ram++;
>    }
>   for (j=0;j<NHITS;j++){
>            *iqbuff[1]++ = *(float *)(dualram[1]+j**gates);   // Gate0 I
>            *iqbuff[1]++ = *(float *)(dualram[1]+j**gates+1); // Gate0 Q
>            ram = (float *)(dualram[1]+j**gates+*xstart);
>            for (i=0;i< *xstop-*xstart;i++)
>                 *iqbuff[1]++ = *(float *)ram++;
>    }
>   pos_prod++;
>
>    if (pos_prod == numhits )
>            pos_prod = 0 ;
>
>
>    *Ack = 0;
>    if(Intnum > 7)
>       outp(0xA0,0x20);                /* reset PIC1 */ /* do this first */
>    outp(0x20,0x20);                /* reset PIC0 */
>   // enable();
> }
> static void End_IntDirac (void) {}

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