* 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>
- * -->
- *
- * \brief Simple realtime multitasking scheduler.
- * Context switching is only done cooperatively.
- *
- * \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()
-
-
-/*
- * The time sharing scheduler forces a task switch when the current
- * process has exhausted its quantum.
- */
-uint16_t Quantum;
-
-/**
- * Disable preemptive task switching.
+ * \note This file is deprecated and kept only for backward compatibility.
*
- * The scheduler maintains a per-process nesting counter. Task switching is
- * effectively re-enabled only when the number of calls to proc_permit()
- * matches the number of calls to proc_forbid().
- *
- * Calling functions that could sleep while task switching is disabled
- * is dangerous, although supported. Preemptive task switching is
- * resumed while the process is sleeping and disabled again as soon as
- * it wakes up again.
- *
- * \sa proc_permit()
- */
-void proc_forbid(void)
-{
- /* No need to protect against interrupts here. */
- ++CurrentProcess->forbid_cnt;
-}
-
-/**
- * Re-enable preemptive task switching.
- *
- * \sa proc_forbid()
+ * -->
*/
-void proc_permit(void)
-{
- /* 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(void)
-{
- // TODO: check Quantum
-
- alarm(1);
-
- if (CurrentProcess)
- {
- TRACEMSG("preempting %p:%s", CurrentProcess, CurrentProcess->monitor.name);
- ATOMIC(SCHED_ENQUEUE(CurrentProcess));
- proc_schedule();
- }
-}
-
-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 *old_process;
-
-// 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 */
-
-// if (CurrentProcess->leaving)
-// {
-// TRACEMSG("leaving to %p:%s", CurrentProcess, CurrentProcess->monitor.name);
-// return;
-// }
-
- old_process = CurrentProcess;
-
- irq_handlers[signum]();
-
- if (old_process != CurrentProcess)
- {
- TRACEMSG("switching from %p:%s to %p:%s",
- old_process, old_process->monitor.name,
- CurrentProcess, CurrentProcess->monitor.name);
- swapcontext(&old_process->context, &CurrentProcess->context);
-// TRACEMSG("launching %p:%s", CurrentProcess, CurrentProcess->monitor.name);
-// CurrentProcess->leaving = true;
-// setcontext(&CurrentProcess->context);
- /* not reached */
- }
-
- TRACEMSG("keeping %p:%s", CurrentProcess, CurrentProcess->monitor.name);
-}
-
-void preempt_init(void)
-{
- struct sigaction act;
- act.sa_handler = irq_entry;
- sigemptyset(&act.sa_mask);
- sigaddset(&act.sa_mask, SIGUSR1);
- sigaddset(&act.sa_mask, SIGALRM);
- 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);
-
- alarm(1); // FIXME
-}