int main() {
int i;
syscall_lock_create(&barber_lock);
syscall_lock_acquire(&barber_lock);
syscall_condition_create(&barber_cond);
syscall_condition_create(&standing_cond);
syscall_condition_create(&sitting_cond);
for(i=0; i<(BARBERS); i++) {
barber[i].id = i;
syscall_condition_create(&barber[i].cond);
syscall_fork((void (*)(int))(&barber_function), (int)&barber[i]);
}
for(i=0; i<(CUSTOMERS); i++) {
customers[i].id = i;
syscall_condition_create(&customers[i].cond);
syscall_fork((void (*)(int))(&customer_function), (int)&customers[i]);
}
syscall_lock_release(&barber_lock);
syscall_exit(0);
return 0;
}
int main() {
syscall_lock_create(&baton_lock);
syscall_lock_acquire(&baton_lock);
// Setup data for threads
thread_data data[THREADS];
int i;
for(i=0; i<(THREADS); i++) {
data[i].id = i;
data[i].baton = 0;
data[i].countdown = 0;
syscall_condition_create(&data[i].cond);
data[i].next = &data[(i+1)%THREADS];
syscall_fork((void (*)(int))(&thread_function), (int)&data[i]);
}
// Setup special data for the first thread
data[0].countdown = ROUNDS;
data[0].baton = 1;
// Start first thread
syscall_condition_signal(&data[0].cond, &baton_lock);
syscall_lock_release(&baton_lock);
syscall_exit(0);
return 0;
}
/*-----------------------------------------------------------------------------------*/
static struct sys_sem *
sys_sem_new_(u8_t count)
{
struct sys_sem *sem;
sem = malloc(sizeof(struct sys_sem));
if (sem != NULL) {
sem->c = count;
if (M_OK != syscall_condition_create(&sem->cond)) {
fprintf(stderr, "%s:%d %s faild\n", __FILE__, __LINE__, __func__);
exit(-1);
}
if (M_OK != syscall_mutex_create(&(sem->mutex))) {
fprintf(stderr, "%s:%d %s faild\n", __FILE__, __LINE__, __func__);
exit(-1);
}
}
return sem;
}
/**
* Handle system calls. Interrupts are enabled when this function is
* called.
*
* @param user_context The userland context (CPU registers as they
* where when system call instruction was called in userland)
*/
void syscall_handle(context_t *user_context)
{
/* When a syscall is executed in userland, register a0 contains
* the number of the syscall. Registers a1, a2 and a3 contain the
* arguments of the syscall. The userland code expects that after
* returning from the syscall instruction the return value of the
* syscall is found in register v0. Before entering this function
* the userland context has been saved to user_context and after
* returning from this function the userland context will be
* restored from user_context.
*/
switch(user_context->cpu_regs[MIPS_REGISTER_A0]) {
case SYSCALL_HALT:
halt_kernel();
break;
case SYSCALL_EXIT:
syscall_exit(user_context->cpu_regs[MIPS_REGISTER_A1]);
break;
case SYSCALL_WRITE:
user_context->cpu_regs[MIPS_REGISTER_V0] =
syscall_write(user_context->cpu_regs[MIPS_REGISTER_A1],
(char*)user_context->cpu_regs[MIPS_REGISTER_A2],
(user_context->cpu_regs[MIPS_REGISTER_A3]));
break;
case SYSCALL_READ:
user_context->cpu_regs[MIPS_REGISTER_V0] =
syscall_read(user_context->cpu_regs[MIPS_REGISTER_A1],
(char*)user_context->cpu_regs[MIPS_REGISTER_A2],
(user_context->cpu_regs[MIPS_REGISTER_A3]));
break;
case SYSCALL_JOIN:
user_context->cpu_regs[MIPS_REGISTER_V0] =
syscall_join(user_context->cpu_regs[MIPS_REGISTER_A1]);
break;
case SYSCALL_EXEC:
user_context->cpu_regs[MIPS_REGISTER_V0] =
syscall_exec((char*)user_context->cpu_regs[MIPS_REGISTER_A1]);
break;
case SYSCALL_FORK:
user_context->cpu_regs[MIPS_REGISTER_V0] =
syscall_fork((void (*)(int))user_context->cpu_regs[MIPS_REGISTER_A1],
user_context->cpu_regs[MIPS_REGISTER_A2]);
break;
case SYSCALL_LOCK_CREATE:
user_context->cpu_regs[MIPS_REGISTER_V0] =
syscall_lock_create((lock_t*) user_context->cpu_regs[MIPS_REGISTER_A1]);
break;
case SYSCALL_LOCK_ACQUIRE:
syscall_lock_acquire((lock_t*) user_context->cpu_regs[MIPS_REGISTER_A1]);
break;
case SYSCALL_LOCK_RELEASE:
syscall_lock_release((lock_t*) user_context->cpu_regs[MIPS_REGISTER_A1]);
break;
case SYSCALL_CONDITION_CREATE:
user_context->cpu_regs[MIPS_REGISTER_V0] =
syscall_condition_create((cond_t*) user_context->cpu_regs[MIPS_REGISTER_A1]);
break;
case SYSCALL_CONDITION_WAIT:
syscall_condition_wait((cond_t*) user_context->cpu_regs[MIPS_REGISTER_A1],
(lock_t*) user_context->cpu_regs[MIPS_REGISTER_A2]);
break;
case SYSCALL_CONDITION_SIGNAL:
syscall_condition_signal((cond_t*) user_context->cpu_regs[MIPS_REGISTER_A1],
(lock_t*) user_context->cpu_regs[MIPS_REGISTER_A2]);
break;
case SYSCALL_CONDITION_BROADCAST:
syscall_condition_broadcast((cond_t*) user_context->cpu_regs[MIPS_REGISTER_A1],
(lock_t*) user_context->cpu_regs[MIPS_REGISTER_A2]);
break;
default:
KERNEL_PANIC("Unhandled system call\n");
}
/* Move to next instruction after system call */
user_context->pc += 4;
}
