104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
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//******************************************************************************
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// Course: BSy
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// File: banking.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 <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <pthread.h>
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#include "banking.h"
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//******************************************************************************
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typedef struct account_struct_ {
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long int balance;
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pthread_mutex_t acntLock;
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} Account;
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typedef struct branch_struct {
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Account *accounts;
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pthread_mutex_t branchLock;
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} Branch;
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//******************************************************************************
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static Branch *Bank;
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static int nBranches, nAccounts;
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//******************************************************************************
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// banking functions
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void makeBank(int num_branches, int num_accounts) {
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nBranches = num_branches;
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nAccounts = num_accounts;
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Bank = (Branch *)malloc(nBranches * sizeof(Branch));
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pthread_mutexattr_t attr;
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pthread_mutexattr_init(&attr);
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for (int i = 0; i < nBranches; i++) {
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Bank[i].accounts = (Account *)malloc(nAccounts * sizeof(Account));
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pthread_mutex_init(&(Bank[i].branchLock), &attr);
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for (int j = 0; j < nAccounts; j++) {
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Bank[i].accounts[j].balance = 0;
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pthread_mutex_init((&(Bank[i].accounts[j].acntLock)), &attr);
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}
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}
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}
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void deleteBank(void) {
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for (int i = 0; i < nBranches; i++)
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free(Bank[i].accounts);
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free(Bank);
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nBranches = nAccounts = 0;
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}
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long int withdraw(int branchNr, int accountNr, long int value) {
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int rv, tmp;
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rv = 0;
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tmp = Bank[branchNr].accounts[accountNr].balance - value;
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if (tmp >= 0) {
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Bank[branchNr].accounts[accountNr].balance = tmp;
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rv = value;
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}
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return rv;
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}
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void deposit(int branchNr, int accountNr, long int value) {
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Bank[branchNr].accounts[accountNr].balance += value;
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}
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void transfer(int fromB, int toB, int accountNr, long int value) {
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int money = withdraw(fromB, accountNr, value);
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if (money >= 0)
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deposit(toB, accountNr, money);
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}
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void checkAssets(void) {
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static long assets = 0;
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long sum = 0;
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for (int i = 0; i < nBranches; i++) {
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for (int j = 0; j < nAccounts; j++) {
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sum += (long)Bank[i].accounts[j].balance;
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}
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}
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if (assets == 0) {
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assets = sum;
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printf("Balance of accounts is: %ld\n", sum);
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}
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else {
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if (sum != assets)
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printf("Balance of accounts is: %ld ... not correct\n", sum);
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else
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printf("Balance of accounts is: %ld ... correct\n", assets);
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}
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}
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//******************************************************************************
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