/* -*- 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/. */

/*
** File:            concur.c
** Description:     test of adding and removing concurrency options
*/

#include "prcvar.h"
#include "prinit.h"
#include "prinrval.h"
#include "prlock.h"
#include "prprf.h"
#include "prmem.h"
#include "prlog.h"

#include "plgetopt.h"

#include "private/pprio.h"

#include <stdlib.h>

#define DEFAULT_RANGE 10
#define DEFAULT_LOOPS 100

static PRThreadScope thread_scope = PR_LOCAL_THREAD;

typedef struct Context
{
    PRLock *ml;
    PRCondVar *cv;
    PRIntn want, have;
} Context;


/*
** Make the instance of 'context' static (not on the stack)
** for Win16 threads
*/
static Context context = {NULL, NULL, 0, 0};

static void PR_CALLBACK Dull(void *arg)
{
    Context *context = (Context*)arg;
    PR_Lock(context->ml);
    context->have += 1;
    while (context->want >= context->have) {
        PR_WaitCondVar(context->cv, PR_INTERVAL_NO_TIMEOUT);
    }
    context->have -= 1;
    PR_Unlock(context->ml);
}  /* Dull */

PRIntn PR_CALLBACK Concur(PRIntn argc, char **argv)
{
    PRUintn cpus;
    PLOptStatus os;
    PRThread **threads;
    PRBool debug = PR_FALSE;
    PRUintn range = DEFAULT_RANGE;
    PRStatus rc;
    PRUintn cnt;
    PRUintn loops = DEFAULT_LOOPS;
    PRIntervalTime hundredMills = PR_MillisecondsToInterval(100);
    PLOptState *opt = PL_CreateOptState(argc, argv, "Gdl:r:");
    while (PL_OPT_EOL != (os = PL_GetNextOpt(opt)))
    {
        if (PL_OPT_BAD == os) {
            continue;
        }
        switch (opt->option)
        {
            case 'G':  /* GLOBAL threads */
                thread_scope = PR_GLOBAL_THREAD;
                break;
            case 'd':  /* debug mode */
                debug = PR_TRUE;
                break;
            case 'r':  /* range limit */
                range = atoi(opt->value);
                break;
            case 'l':  /* loop counter */
                loops = atoi(opt->value);
                break;
            default:
                break;
        }
    }
    PL_DestroyOptState(opt);

    if (0 == range) {
        range = DEFAULT_RANGE;
    }
    if (0 == loops) {
        loops = DEFAULT_LOOPS;
    }

    context.ml = PR_NewLock();
    context.cv = PR_NewCondVar(context.ml);

    if (debug)
        PR_fprintf(
            PR_STDERR, "Testing with %d CPUs and %d interations\n", range, loops);

    threads = (PRThread**) PR_CALLOC(sizeof(PRThread*) * range);
    while (--loops > 0)
    {
        for (cpus = 1; cpus <= range; ++cpus)
        {
            PR_SetConcurrency(cpus);
            context.want = cpus;

            threads[cpus - 1] = PR_CreateThread(
                                    PR_USER_THREAD, Dull, &context, PR_PRIORITY_NORMAL,
                                    thread_scope, PR_JOINABLE_THREAD, 0);
        }

        PR_Sleep(hundredMills);

        for (cpus = range; cpus > 0; cpus--)
        {
            PR_SetConcurrency(cpus);
            context.want = cpus - 1;

            PR_Lock(context.ml);
            PR_NotifyCondVar(context.cv);
            PR_Unlock(context.ml);
        }
        for(cnt = 0; cnt < range; cnt++) {
            rc = PR_JoinThread(threads[cnt]);
            PR_ASSERT(rc == PR_SUCCESS);
        }
    }


    if (debug)
        PR_fprintf(
            PR_STDERR, "Waiting for %d thread(s) to exit\n", context.have);

    while (context.have > 0) {
        PR_Sleep(hundredMills);
    }

    if (debug)
        PR_fprintf(
            PR_STDERR, "Finished [want: %d, have: %d]\n",
            context.want, context.have);

    PR_DestroyLock(context.ml);
    PR_DestroyCondVar(context.cv);
    PR_DELETE(threads);

    PR_fprintf(PR_STDERR, "PASSED\n");

    return 0;
} /* Concur */

int main(int argc, char **argv)
{
    PR_STDIO_INIT();
    return PR_Initialize(Concur, argc, argv, 0);
}  /* main */

/* concur.c */