source: vbox/trunk/src/libs/xpcom18a4/nsprpub/pr/tests/sem.c@ 26515

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/***********************************************************************
**
** Name: sem.c
**
** Description: Tests Semaphonre functions.
**
** Modification History:
** 20-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.
***********************************************************************/

/***********************************************************************
** Includes
***********************************************************************/
/* Used to get the command line option */
#include "plgetopt.h"

#include "nspr.h"
#include "prpriv.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

PRIntn failed_already=0;
PRIntn debug_mode;

/* 
        Since we don't have stdin, stdout everywhere, we will fake 
        it with our in-memory buffers called stdin and stdout.
*/

#define SBSIZE 1024

#ifdef XP_MAC
#include "prlog.h"
#include "prsem.h"
#define printf PR_LogPrint
extern void SetupMacPrintfLog(char *logFile);
#else
#include "obsolete/prsem.h"
#endif

static char stdinBuf[SBSIZE];
static char stdoutBuf[SBSIZE];

static PRUintn stdinBufIdx = 0;
static PRUintn stdoutBufIdx = 0;
static PRStatus finalResult = PR_SUCCESS;


static size_t dread (PRUintn device, char *buf, size_t bufSize)
{
        PRUintn i;
        
        /* during first read call, initialize the stdinBuf buffer*/
        if (stdinBufIdx == 0) {
                for (i=0; i<SBSIZE; i++)
                        stdinBuf[i] = i;
        }

        /* now copy data from stdinBuf to the given buffer upto bufSize */
        for (i=0; i<bufSize; i++) {
                if (stdinBufIdx == SBSIZE)
                        break;
                buf[i] = stdinBuf[stdinBufIdx++];
        }

        return i;
}

static size_t dwrite (PRUintn device, char *buf, size_t bufSize)
{
        PRUintn i, j;
        
        /* copy data from the given buffer upto bufSize to stdoutBuf */
        for (i=0; i<bufSize; i++) {
                if (stdoutBufIdx == SBSIZE)
                        break;
                stdoutBuf[stdoutBufIdx++] = buf[i];
        }

        /* during last write call, compare the two buffers */
        if (stdoutBufIdx == SBSIZE)
                for (j=0; j<SBSIZE; j++)
                        if (stdinBuf[j] != stdoutBuf[j]) {
                                if (debug_mode) printf("data mismatch for index= %d \n", j);
                                finalResult = PR_FAILURE;
                        }

        return i;
}

/*------------------ Following is the real test program ---------*/
/*
        Program to copy standard input to standard output.  The program
        uses two threads.  One reads the input and puts the data in a 
        double buffer.  The other reads the buffer contents and writes 
        it to standard output.
*/

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

static void writer(void)
{
        PRUintn i = 0;
        size_t  nbytes;
        
        do {
                (void) PR_WaitSem(fullBufs);
                nbytes = buf[i].nbytes;
                if (nbytes > 0) {
                        nbytes = dwrite(1, buf[i].data, nbytes);
                        PR_PostSem(emptyBufs);
                        i = (i + 1) % 2;
                }
        } while (nbytes > 0);
}

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

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

    {
        /* The command line argument: -d is used to determine if the test is being run
        in debug mode. The regress tool requires only one line output:PASS or FAIL.
        All of the printfs associated with this test has been handled with a if (debug_mode)
        test.
        Usage: test_name -d
        */
        PLOptStatus os;
        PLOptState *opt = PL_CreateOptState(argc, argv, "d:");
        while (PL_OPT_EOL != (os = PL_GetNextOpt(opt)))
        {
                if (PL_OPT_BAD == os) continue;
            switch (opt->option)
            {
            case 'd':  /* debug mode */
                        debug_mode = 1;
                break;
             default:
                break;
            }
        }
        PL_DestroyOptState(opt);
    }        

 /* main test */

#ifdef XP_MAC
        SetupMacPrintfLog("sem.log");
        debug_mode = 1;
#endif

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

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

        /* create the reader thread */
        
        r = PR_CreateThread(PR_USER_THREAD,
                                      reader, 0, 
                                      PR_PRIORITY_NORMAL,
                                      PR_LOCAL_THREAD,
                                  PR_UNJOINABLE_THREAD,
                                      0);

        /* Do the writer operation in this thread */
        writer();

        PR_DestroySem(emptyBufs);
        PR_DestroySem(fullBufs);

        if (finalResult == PR_SUCCESS) {
                if (debug_mode) printf("sem Test Passed.\n");
        }
        else{
                if (debug_mode) printf("sem Test Failed.\n");
                failed_already=1;
        }
    PR_Cleanup();
        if(failed_already)      
                return 1;
        else
                return 0;
}