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#include"stdlib.h"
#include"stdio.h"
#include"time.h"
#include"sched.h"
#include"linux/sem.h"
#include"errno.h"
#define NCNT 10
#define INIT_BANK 10000
#define STACK_FRAME 8192
void* ThreadProc(int* arg);
long account[NCNT];
unsigned long ntrans;
int main()
{
    int nRetCode = 0;
    int i;
    int clone_flag;
    int arg[NCNT];
    char *stack[NCNT], *st[NCNT];
    char ch;
    ntrans = 0;
    clone_flag = CLONE_VM|CLONE_SIGHAND|CLONE_FS|CLONE_FILES;
    for(i=0; i<NCNT; i++)
    {
        arg[i] = i;
        account[i] = INIT_BANK;
    }
    for(i=0; i<NCNT; i++)
    {
        st[i] = (char*)malloc(STACK_FRAME);
        stack[i] = st[i]+STACK_FRAME;
        clone((void*)ThreadProc, stack[i], clone_flag, &arg[i]);
    }
    for(i=0; i<NCNT; i++)
        free(st[i]);
    while((ch = getchar())! = 'c')
        return nRetCode;
}
void test()
{
    int i;
    long sum = 0;
    for(i=0; i<NCNT; i++)   sum += account[i];
    printf("trans=%ld    sum=%ld\n", ntrans, sum);
    for(i=0; i<NCNT; i++)
        printf("[%2d]=%5ld/n", i, account[i]);
    printf("\n");
}
void transfer(int from, int to, int amount)
{
    int t;
    int i;
    while(account[from] < amount)   usleep(10000);
    t = account[from];
    t = t-amount;
    account[from] = t;
    t = account[to];
    t = t+amount;
    account[to] = t;
    usleep(10);
    ntrans++;
    if(ntrans % 1000==0)    test();
}
void* ThreadProc(int *arg)
{
    int from;
    from = *arg;
    while(1)
    {
        srand((unsigned)time(NULL));
        int to = (int)(NCNT*(rand()/(RAND_MAX+1, 0)));
        if(to==NCNT)    to = 0;
        if(to==from)    to = (to+1)%NCNT;
        int amount = 1+(int)( (INIT_BANK*(rand()/(RAND_MAX+1, 0)))/2 );
        transfer(from, to, amount);
    }
    return;
}