X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Fkern%2Fpreempt.c;h=078724b42a8e38095fb93e3c6e226d2e2b5e2d70;hb=e8b0472be10fba4ca6baa62d8d483db90e28c06e;hp=dfa343d7a9b702c769a590d8b76e0a409bdec9e2;hpb=0315f64ec2ee2c5eb10634360fb8874c52dbbabf;p=bertos.git

diff --git a/bertos/kern/preempt.c b/bertos/kern/preempt.c
index dfa343d7..078724b4 100644
--- a/bertos/kern/preempt.c
+++ b/bertos/kern/preempt.c
@@ -26,161 +26,7 @@
  * 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));
-
-	IRQ_DISABLE;
-	/* Poll on the ready queue for the first ready process */
-	while (!(CurrentProcess = (struct Process *)list_remHead(&ProcReadyList)))
-	{
-		/*
-		 * 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;
-		CPU_IDLE;
-		MEMORY_BARRIER;
-		IRQ_DISABLE;
-	}
-	IRQ_ENABLE;
-}
-
-void proc_preempt_timer(void)
-{
-	// TODO: check Quantum
-
-	alarm(1);
-	ATOMIC(SCHED_ENQUEUE(CurrentProcess));
-	proc_schedule();
-}
-
-void proc_schedule(void)
-{
-	kill(0, SIGUSR1);
-}
-
-void proc_yield(void)
-{
-	ATOMIC(SCHED_ENQUEUE(CurrentProcess));
-
-	proc_schedule();
-}
-
-/* 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("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
-}