/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/***********************************************************************
**
** Name: fileio.c
**
** Description: Program to copy one file to another.
**
** Modification History:
** 14-May-97 AGarcia- Converted the test to accomodate the debug_mode flag.
**           The debug mode will print all of the printfs associated with this test.
**           The regress mode will be the default mode. Since the regress tool limits
**           the output to a one line status:PASS or FAIL,all of the printf statements
**           have been handled with an if (debug_mode) statement.
** 04-June-97 AGarcia removed the Test_Result function. Regress tool has been updated to
**          recognize the return code from tha main program.
** 12-June-97 Revert to return code 0 and 1, remove debug option (obsolete).
***********************************************************************/

/***********************************************************************
** Includes
***********************************************************************/
#include "prinit.h"
#include "prthread.h"
#include "prlock.h"
#include "prcvar.h"
#include "prmon.h"
#include "prmem.h"
#include "prio.h"
#include "prlog.h"

#include <stdio.h>

#include "obsolete/prsem.h"


#define TBSIZE 1024

static PRUint8 tbuf[TBSIZE];

static PRFileDesc *t1, *t2;

PRIntn failed_already=0;
PRIntn debug_mode;
static void InitialSetup(void)
{
    PRUintn i;
    PRInt32 nWritten, rv;

    t1 = PR_Open("t1.tmp", PR_CREATE_FILE | PR_RDWR, 0);
    PR_ASSERT(t1 != NULL);

    for (i=0; i<TBSIZE; i++) {
        tbuf[i] = i;
    }

    nWritten = PR_Write((PRFileDesc*)t1, tbuf, TBSIZE);
    PR_ASSERT(nWritten == TBSIZE);

    rv = PR_Seek(t1,0,PR_SEEK_SET);
    PR_ASSERT(rv == 0);

    t2 = PR_Open("t2.tmp", PR_CREATE_FILE | PR_RDWR, 0);
    PR_ASSERT(t2 != NULL);
}


static void VerifyAndCleanup(void)
{
    PRUintn i;
    PRInt32 nRead, rv;

    for (i=0; i<TBSIZE; i++) {
        tbuf[i] = 0;
    }

    rv = PR_Seek(t2,0,PR_SEEK_SET);
    PR_ASSERT(rv == 0);

    nRead = PR_Read((PRFileDesc*)t2, tbuf, TBSIZE);
    PR_ASSERT(nRead == TBSIZE);

    for (i=0; i<TBSIZE; i++)
        if (tbuf[i] != (PRUint8)i) {
            if (debug_mode) {
                printf("data mismatch for index= %d \n", i);
            }
            else {
                failed_already=1;
            }
        }
    PR_Close(t1);
    PR_Close(t2);

    PR_Delete("t1.tmp");
    PR_Delete("t2.tmp");

    if (debug_mode) {
        printf("fileio test passed\n");
    }
}


/*------------------ Following is the real test program ---------*/
/*
    Program to copy one file to another.  Two temporary files get
    created.  First one gets written in one write call.  Then,
    a reader thread reads from this file into a double buffer.
    The writer thread writes from double buffer into the other
    temporary file.  The second temporary file gets verified
    for accurate data.
*/

PRSemaphore *emptyBufs; /* number of empty buffers */
PRSemaphore *fullBufs;  /* number of buffers that are full */

#define BSIZE   100

struct {
    char data[BSIZE];
    PRUintn nbytes;     /* number of bytes in this buffer */
} buf[2];

static void PR_CALLBACK reader(void *arg)
{
    PRUintn i = 0;
    PRInt32 nbytes;

    do {
        (void) PR_WaitSem(emptyBufs);
        nbytes = PR_Read((PRFileDesc*)arg, buf[i].data, BSIZE);
        if (nbytes >= 0) {
            buf[i].nbytes = nbytes;
            PR_PostSem(fullBufs);
            i = (i + 1) % 2;
        }
    } while (nbytes > 0);
}

static void PR_CALLBACK writer(void *arg)
{
    PRUintn i = 0;
    PRInt32 nbytes;

    do {
        (void) PR_WaitSem(fullBufs);
        nbytes = buf[i].nbytes;
        if (nbytes > 0) {
            nbytes = PR_Write((PRFileDesc*)arg, buf[i].data, nbytes);
            PR_PostSem(emptyBufs);
            i = (i + 1) % 2;
        }
    } while (nbytes > 0);
}

int main(int argc, char **argv)
{
    PRThread *r, *w;


    PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
    PR_STDIO_INIT();

    emptyBufs = PR_NewSem(2);   /* two empty buffers */

    fullBufs = PR_NewSem(0);    /* zero full buffers */

    /* Create initial temp file setup */
    InitialSetup();

    /* create the reader thread */

    r = PR_CreateThread(PR_USER_THREAD,
                        reader, t1,
                        PR_PRIORITY_NORMAL,
                        PR_LOCAL_THREAD,
                        PR_JOINABLE_THREAD,
                        0);

    w = PR_CreateThread(PR_USER_THREAD,
                        writer, t2,
                        PR_PRIORITY_NORMAL,
                        PR_LOCAL_THREAD,
                        PR_JOINABLE_THREAD,
                        0);

    /* Do the joining for both threads */
    (void) PR_JoinThread(r);
    (void) PR_JoinThread(w);

    /* Do the verification and clean up */
    VerifyAndCleanup();

    PR_DestroySem(emptyBufs);
    PR_DestroySem(fullBufs);

    PR_Cleanup();

    if(failed_already)
    {
        printf("Fail\n");
        return 1;
    }
    else
    {
        printf("PASS\n");
        return 0;
    }


}