* invalidate any other reasons why the executable file might be covered by
* the GNU General Public License.
*
- * Copyright 2001, 2004 Develer S.r.l. (http://www.develer.com/)
- * Copyright 1999, 2000, 2001, 2008 Bernie Innocenti <bernie@codewiz.org>
+ * Copyright 2008 Bernie Innocenti <bernie@codewiz.org>
* -->
*
* \brief Simple realtime multitasking scheduler.
*
* \version $Id: proc.c 1616 2008-08-10 19:41:26Z bernie $
* \author Bernie Innocenti <bernie@codewiz.org>
- * \author Stefano Fedrigo <aleph@develer.com>
*/
#include "proc_p.h"
#include "proc.h"
#include <cpu/frame.h> // CPU_IDLE
-
-#include <unistd.h> // XXX alarm()
+#include <drv/timer.h>
/*
*/
uint16_t Quantum;
+Timer preempt_timer;
+
/**
* Disable preemptive task switching.
*
ATOMIC(LIST_ASSERT_VALID(&ProcReadyList));
+ TRACEMSG("hello1");
IRQ_DISABLE;
/* Poll on the ready queue for the first ready process */
while (!(CurrentProcess = (struct Process *)list_remHead(&ProcReadyList)))
{
+ //TRACEMSG("hello2");
/*
* Make sure we physically reenable interrupts here, no matter what
* the current task status is. This is important because if we
* are reloaded.
*/
IRQ_ENABLE;
- CPU_IDLE;
+ //FIXME: calls Qt stuff from sighandler! CPU_IDLE;
MEMORY_BARRIER;
IRQ_DISABLE;
+ //TRACEMSG("hello3");
}
IRQ_ENABLE;
+ TRACEMSG("hello4");
}
-void proc_preempt_timer(void)
+void proc_preempt_timer(UNUSED_ARG(void *, param))
{
- // TODO: check Quantum
+ IRQ_DISABLE;
+ if (CurrentProcess)
+ {
+ TRACEMSG("preempting %p:%s", CurrentProcess, CurrentProcess->monitor.name);
+ SCHED_ENQUEUE(CurrentProcess);
+ IRQ_ENABLE;
+ proc_preempt();
+ }
+ IRQ_ENABLE;
- alarm(1);
- ATOMIC(SCHED_ENQUEUE(CurrentProcess));
- proc_schedule();
+ timer_setDelay(&preempt_timer, CONFIG_KERN_QUANTUM);
+ timer_add(&preempt_timer);
}
void proc_schedule(void)
{
+ TRACE;
+
+ // Will invoke proc_preempt() in interrupt context
kill(0, SIGUSR1);
}
proc_schedule();
}
+void proc_entry(void (*user_entry)(void))
+{
+ user_entry();
+ proc_exit();
+}
+
/* signal handler */
void irq_entry(int signum)
{
- Process *old_process;
+ Process * const old_process = CurrentProcess;
- TRACEMSG("storing %p:%s", CurrentProcess, CurrentProcess->monitor.name);
- CurrentProcess->leaving = false;
- getcontext(&CurrentProcess->context);
- /* We get here in two ways: directly, and after setcontext() below */
+ irq_handlers[signum]();
- if (CurrentProcess->leaving)
+ if (!CurrentProcess)
{
- TRACEMSG("leaving to %p:%s", CurrentProcess, CurrentProcess->monitor.name);
- return;
+ TRACEMSG("no runnable processes!");
+ IRQ_ENABLE;
+ pause();
}
-
- old_process = CurrentProcess;
-
- irq_handlers[signum]();
-
- if (old_process != CurrentProcess)
+ else
{
- TRACEMSG("launching %p:%s", CurrentProcess, CurrentProcess->monitor.name);
- CurrentProcess->leaving = true;
- setcontext(&CurrentProcess->context);
- /* not reached */
+ if (old_process != CurrentProcess)
+ {
+ TRACEMSG("switching from %p:%s to %p:%s",
+ old_process, old_process ? old_process->monitor.name : "-",
+ CurrentProcess, CurrentProcess->monitor.name);
+
+ if (old_process)
+ swapcontext(&old_process->context, &CurrentProcess->context);
+ else
+ setcontext(&CurrentProcess->context);
+
+ /* not reached */
+ }
+ TRACEMSG("keeping %p:%s", CurrentProcess, CurrentProcess->monitor.name);
}
+}
- TRACEMSG("keeping %p:%s", CurrentProcess, CurrentProcess->monitor.name);
+void irq_register(int irq, void (*callback)(void))
+{
+ irq_handlers[irq] = callback;
}
-void preempt_init(void)
+void irq_init(void)
{
struct sigaction act;
act.sa_handler = irq_entry;
sigemptyset(&act.sa_mask);
- sigaddset(&act.sa_mask, SIGUSR1);
- sigaddset(&act.sa_mask, SIGALRM);
+ //sigaddset(&act.sa_mask, irq);
act.sa_flags = SA_RESTART; /* | SA_SIGINFO; */
- irq_handlers[SIGUSR1] = proc_preempt;
- irq_handlers[SIGALRM] = proc_preempt_timer;
sigaction(SIGUSR1, &act, NULL);
- sigaction(SIGALRM, &act, NULL);
+ #if !(ARCH & ARCH_QT)
+ sigaction(SIGALRM, &act, NULL);
+ #endif
+}
+
+void preempt_init(void)
+{
+ irq_init(); // FIXME: move before
+ irq_register(SIGUSR1, proc_preempt);
- alarm(1);
+ timer_setSoftInt(&preempt_timer, proc_preempt_timer, NULL);
+ timer_setDelay(&preempt_timer, CONFIG_KERN_QUANTUM);
+ timer_add(&preempt_timer);
}