// pingcvtest.cc 
//
// Simple test case for condition variables.
// Alternate two threads, one that prints "ping" and another that
// prints "pong".

#include "copyright.h"
#include "system.h"
#include "synch.h"

Lock *mutex;
Condition *cv;

void
PingPong(int which)
{
    char *msg = (char *) which;
    int i;

    mutex->Acquire();
    for (i = 0; i < 20; i++) {
	printf("%s...", msg);
	cv->Signal(mutex);
	cv->Wait(mutex);
    }
    mutex->Release();
}

void
ThreadTest()
{
    DEBUG('t', "Entering ThreadTest");

    mutex = new Lock("mutex for cv");
    cv = new Condition("ping pong cv");

    char *ping = "ping";
    char *pong = "pong";

    Thread *t = new Thread(ping);
    t->Fork(PingPong, (int) ping);

    PingPong((int) pong);

    printf("\n");
}