* 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 <drv/timer.h>
+
/*
* The time sharing scheduler forces a task switch when the current
*/
uint16_t Quantum;
+Timer preempt_timer;
+
/**
* Disable preemptive task switching.
*
/* No need to protect against interrupts here. */
--CurrentProcess->forbid_cnt;
}
+
+static void (*irq_handlers[100])(void); // FIXME
+
+
+void proc_preempt(void)
+{
+ TRACE;
+
+ 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 idle-spinning, we must allow interrupts, otherwise no
+ * process will ever wake up.
+ *
+ * During idle-spinning, an interrupt can occur and it may
+ * modify \p ProcReadyList. To ensure that compiler reload this
+ * variable every while cycle we call CPU_MEMORY_BARRIER.
+ * The memory barrier ensure that all variables used in this context
+ * are reloaded.
+ */
+ IRQ_ENABLE;
+ //FIXME: calls Qt stuff from sighandler! CPU_IDLE;
+ MEMORY_BARRIER;
+ IRQ_DISABLE;
+ //TRACEMSG("hello3");
+ }
+ IRQ_ENABLE;
+ TRACEMSG("hello4");
+}
+
+void proc_preempt_timer(UNUSED_ARG(void *, param))
+{
+ IRQ_DISABLE;
+ if (CurrentProcess)
+ {
+ TRACEMSG("preempting %p:%s", CurrentProcess, CurrentProcess->monitor.name);
+ SCHED_ENQUEUE(CurrentProcess);
+ IRQ_ENABLE;
+ proc_preempt();
+ }
+ IRQ_ENABLE;
+
+ 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);
+}
+
+void proc_yield(void)
+{
+ ATOMIC(SCHED_ENQUEUE(CurrentProcess));
+
+ proc_schedule();
+}
+
+void proc_entry(void (*user_entry)(void))
+{
+ user_entry();
+ proc_exit();
+}
+
+/* signal handler */
+void irq_entry(int signum)
+{
+ Process * const old_process = CurrentProcess;
+
+ irq_handlers[signum]();
+
+ if (!CurrentProcess)
+ {
+ TRACEMSG("no runnable processes!");
+ IRQ_ENABLE;
+ pause();
+ }
+ else
+ {
+ 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);
+ }
+}
+
+void irq_register(int irq, void (*callback)(void))
+{
+ irq_handlers[irq] = callback;
+}
+
+void irq_init(void)
+{
+ struct sigaction act;
+ act.sa_handler = irq_entry;
+ sigemptyset(&act.sa_mask);
+ //sigaddset(&act.sa_mask, irq);
+ act.sa_flags = SA_RESTART; /* | SA_SIGINFO; */
+
+ sigaction(SIGUSR1, &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);
+
+ timer_setSoftInt(&preempt_timer, proc_preempt_timer, NULL);
+ timer_setDelay(&preempt_timer, CONFIG_KERN_QUANTUM);
+ timer_add(&preempt_timer);
+}