94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
//******************************************************************************
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// Course: BSy
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// File: main.c
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// Author: M. Thaler, ZHAW
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// Purpose: locking mechanisms
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// Version: v.fs20
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//******************************************************************************
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#include <stdio.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include "banking.h"
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#include "mtimer.h"
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#include "mrandom.h"
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//******************************************************************************
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// constant values
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#define MAX_THREADS 16
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#define NUM_THREADS 4
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#define TRANSFERS (16*1024*1024)
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#define ACCOUNTS (2048)
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#define BRANCHES (128)
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//******************************************************************************
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// globals
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int nThreads;
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//******************************************************************************
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// pusher
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void *pusher(void *arg) {
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int idx = (int)(long)(arg);
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mrand_t rand;
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unsigned int seed = 17*idx;
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mrandInit(seed, &rand);
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int account, from, to, val;
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int count = TRANSFERS / nThreads;
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for (int i = 0; i < count; i++) {
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account = (int)(mrandUInt(&rand) % ACCOUNTS);
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from = (int)(mrandUInt(&rand) % BRANCHES);
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to = (int)(mrandUInt(&rand) % BRANCHES);
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val = (int)(mrandRange(1000, 100000, &rand));
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val = withdraw(from, account, val);
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if (val > 0)
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deposit(to, account, val);
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}
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}
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//******************************************************************************
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// main program
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int main(int argc, char *argv[]) {
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gtimer_t timer;
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mrand_t ranvar;
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long assets;
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// thread id's
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pthread_t th[MAX_THREADS];
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// get number of threads or default
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if (argc > 1)
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nThreads = atoi(argv[1]);
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else
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nThreads = NUM_THREADS;
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nThreads = (nThreads > MAX_THREADS) ? MAX_THREADS : nThreads;
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mrandInit((MAX_THREADS + 1)*333, &ranvar);
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printf("\nRunning %d threads\n", nThreads);
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makeBank(BRANCHES, ACCOUNTS);
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for (int i = 0; i < ACCOUNTS; i++)
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deposit(0, i, mrandRange(10, 1000*1000, &ranvar));
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checkAssets();
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startGTimer(timer);
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// create threads and pass thread number
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for (long i = 0; i < nThreads; i++)
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pthread_create(&th[i], NULL, pusher, (void *)i);
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// wait for threads to terminate
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for (int i = 0; i < nThreads; i++)
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pthread_join(th[i], NULL);
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stopGTimer(timer);
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checkAssets();
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printGTime(timer);
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}
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//******************************************************************************
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