///////////////////////////////////////////////////////////////////////////////
//
// FUNCTION NAME: main
//
// PROCESSING:
//
// This function tests the register, unregister, and yield functions from
// user space.
//
// INPUTS:
//
// argc - the number of arguments passed to the program
// argv - the command line vector that contains the arguments passed to the program
//
// RETURN:
//
// int - (0) default with no errors
// (-1) unable to register the PID
//
// IMPLEMENTATION NOTES
//
// The main function tests all the functions that were implemented in kernel
// space that the user-space application will use in order to register and
// unregister with the kernel module, and to change it status using yield.
//
///////////////////////////////////////////////////////////////////////////////
int main(int argc, char* argv[])
{
pid_t mypid;
int j;
long period = 250; // in milliseconds
long processTime = 10; // in milliseconds
// get our PID so that we can register
mypid= syscall(__NR_gettid);
// register with the module
if(!try_register(mypid, period, processTime)){
printf("Unable to register this PID %ld\n", mypid);
return -1;
}
struct timeval tv;
gettimeofday(&tv, NULL);
printf("Current time %d\n", tv.tv_sec);
// writes yield to proc/mp2/status file for this pid
try_yielding(mypid);
gettimeofday(&tv, NULL);
printf("Current time %d\n", tv.tv_sec);
for(j=1; j<100; j++)
{
printf("Factorial %u: %llu\n",j, factorial(10));
try_yielding(mypid);
gettimeofday(&tv, NULL);
printf("Current time %d\n", tv.tv_sec);
}
// unregister from the module
if(try_unregister(mypid)){
printf("We successfully unregistered from the module!\n");
}else{
printf("We are still registered...\n");
}
}
cv_cancellation_guard(const cancellation_token& token, Handler& handler) :
_token(token), _handler(handler)
{ _registered = try_register(_token, _handler); }
