void gender3(){
int val1 = semvalue(1);
int val2 = semvalue(2);
int up, down;
if ((val1 == 1001)||semvalue(1)==1001){
down = semdown(3);
}else {
up = semup(1);
up = semup(2);
up = semup(4);
repTIME = rand()%200000+2000;
usleep(repTIME);
int time = rand()%40000+1000;
usleep(time);
}
}
/* what does this program do?
First we make a semaphore
check what its value is
do semdown on it
start sleep 10 seconds
-> at this point, another program would try to semdown the semaphore we created
end sleep
now do a semup, program B should be able to proceed.
-> program C should now free the semaphore, and try a semvalue on it.
*/
int main() {
int result;
int e;
message m;
e = errno;
printf("+-----------------+\n");
printf("| Program A Start |\n");
printf("+-----------------+\n");
result = seminit(2000, 1);
printf("<1> Create semaphore named 2000, with value 1: result=%d & e=%d\n", result, errno);
result = semvalue(2000);
printf("<2> Look at value of semaphore[index for indentifier(2000)]: result=%d & e=%d\n", result, errno);
result = semdown(2000);
printf("<3> Do a sem down: result=%d & e=%d\n", result, errno);
printf("<4> I am to do nothing for 10 seconds.\n");
int wait_unit;
for (wait_unit = 1; wait_unit < 11; wait_unit++) {
sleep(1);
printf(" Waiting %d\n", wait_unit);
}
printf("<4> I done doing nothing.\n");
result = semup(2000);
printf("<5> Sem Up: result=%d & e=%d\n", result, errno);
printf("<6> Program A has no more to do.\n", result, errno);
return 0;
}
void gender2(){
int val1 = semvalue(1);
int val3 = semvalue(3);
int down, up;
if ((val1 == 1001)&&(val3 == 1001)){
down = semdown(2);
}else {
int nursVAL = semvalue(4);
while (nursVAL == 1001);
up = semup(2);
up = semup(3);
while (repTIME == 0);
usleep(repTIME);
int time = rand()%4000000+1000;
usleep(time);
}
}
int main()
{
int semid;
int semval;
seminit(&semid, 0);
semval = semvalue(semid);
printf("semval: %d\n", semval);
semv(semid);
semval = semvalue(semid);
printf("semval: %d\n", semval);
semp(semid);
#if 0
#endif
semdistr(semid);
return 0;
}
/* what does this program do?
First we make a semaphore
check what its value is
do semdown on it
start sleep 10 seconds
-> at this point, another program would try to semdown the semaphore we created
end sleep
now do a semup, program B should be able to proceed.
-> program C should now free the semaphore, and try a semvalue on it.
*/
int main() {
int result;
int e;
message m;
e = errno;
printf("+-----------------+\n");
printf("| Program D Start |\n");
printf("+-----------------+\n");
result = semfree(2000);
printf("<1> Free semaphore (return 1 if successful): result=%d & e=%d\n", result, errno);
result = semvalue(2000);
printf("<2> Can we still see value? this should fail: result=%d & e=%d\n", result, errno);
return 0;
}
