* invalidate any other reasons why the executable file might be covered by
* the GNU General Public License.
*
- * Copyright 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>
- */
-
-#include "proc_p.h"
-#include "proc.h"
-
-#include <kern/irq.h>
-#include <cpu/frame.h> // CPU_IDLE
-#include <drv/timer.h>
-#include <cfg/module.h>
-
-
-/*
- * The time sharing scheduler forces a task switch when the current
- * process has exhausted its quantum.
- */
-uint16_t Quantum;
-
-Timer preempt_timer;
-
-/**
- * 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;
-}
-
-
-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();
-}
-
-void preempt_init(void)
-{
- MOD_CHECK(irq);
- MOD_CHECK(timer);
-
- irq_register(SIGUSR1, proc_preempt);
-
- timer_setSoftint(&preempt_timer, proc_preempt_timer, NULL);
- timer_setDelay(&preempt_timer, CONFIG_KERN_QUANTUM);
- timer_add(&preempt_timer);
-}