bertos/mware/observer.c \
bertos/mware/resource.c \
bertos/mware/sprintf.c \
+ bertos/kern/coop.c \
bertos/kern/proc.c \
bertos/kern/proc_test.c \
bertos/kern/sem.c \
--- /dev/null
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction. Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License. This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2001, 2004, 2008 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 1999, 2000, 2001 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"
+
+// Log settings for cfg/log.h.
+#define LOG_LEVEL KERN_LOG_LEVEL
+#define LOG_FORMAT KERN_LOG_FORMAT
+#include <cfg/log.h>
+
+#include <cpu/irq.h>
+#include <cpu/types.h>
+#include <cpu/attr.h>
+#include <cpu/frame.h>
+
+/**
+ * CPU dependent context switching routines.
+ *
+ * Saving and restoring the context on the stack is done by a CPU-dependent
+ * support routine which usually needs to be written in assembly.
+ */
+EXTERN_C void asm_switch_context(cpustack_t **new_sp, cpustack_t **save_sp);
+
+
+/**
+ * System scheduler: pass CPU control to the next process in
+ * the ready queue.
+ */
+void proc_schedule(void)
+{
+ struct Process *old_process;
+ cpuflags_t flags;
+
+ ATOMIC(LIST_ASSERT_VALID(&ProcReadyList));
+ ASSERT_USER_CONTEXT();
+ ASSERT_IRQ_ENABLED();
+
+ /* Remember old process to save its context later */
+ old_process = CurrentProcess;
+
+ /* Poll on the ready queue for the first ready process */
+ IRQ_SAVE_DISABLE(flags);
+ 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.
+ * \todo If there was a way to write sig_wait() so that it does not
+ * disable interrupts while waiting, there would not be any
+ * reason to do this.
+ */
+ IRQ_ENABLE;
+ CPU_IDLE;
+ MEMORY_BARRIER;
+ IRQ_DISABLE;
+ }
+ IRQ_RESTORE(flags);
+
+ /*
+ * Optimization: don't switch contexts when the active
+ * process has not changed.
+ */
+ if (CurrentProcess != old_process)
+ {
+ cpustack_t *dummy;
+
+ #if CONFIG_KERN_MONITOR
+ LOG_INFO("Switch from %p(%s) to %p(%s)\n",
+ old_process, old_process ? old_process->monitor.name : "NONE",
+ CurrentProcess, CurrentProcess->monitor.name);
+ #endif
+
+ /* Save context of old process and switch to new process. If there is no
+ * old process, we save the old stack pointer into a dummy variable that
+ * we ignore. In fact, this happens only when the old process has just
+ * exited.
+ * TODO: Instead of physically clearing the process at exit time, a zombie
+ * list should be created.
+ */
+ asm_switch_context(&CurrentProcess->stack, old_process ? &old_process->stack : &dummy);
+ }
+
+ /* This RET resumes the execution on the new process */
+}
+
+
+/**
+ * Co-operative context switch
+ */
+void proc_switch(void)
+{
+ ATOMIC(SCHED_ENQUEUE(CurrentProcess));
+
+ proc_schedule();
+}
--- /dev/null
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction. Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License. This exception does not however
+ * 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"
+
+
+/*
+ * The time sharing scheduler forces a task switch when the current
+ * process has exhausted its quantum.
+ */
+uint16_t Quantum;
+
+/**
+ * Disable preemptive task switching.
+ *
+ * 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;
+}
#include "proc.h"
#include "cfg/cfg_arch.h" /* ARCH_EMUL */
-#include <cfg/debug.h>
#include <cfg/module.h>
-// Log settings for cfg/log.h.
-#define LOG_LEVEL KERN_LOG_LEVEL
-#define LOG_FORMAT KERN_LOG_FORMAT
-#include <cfg/log.h>
-
#include <cpu/irq.h>
#include <cpu/types.h>
#include <cpu/attr.h>
#include <cpu/frame.h>
-#include <mware/event.h>
-
#include <string.h> /* memset() */
-/**
- * CPU dependent context switching routines.
- *
- * Saving and restoring the context on the stack is done by a CPU-dependent
- * support routine which usually needs to be written in assembly.
- */
-EXTERN_C void asm_switch_context(cpustack_t **new_sp, cpustack_t **save_sp);
-
/*
* The scheduer tracks ready processes by enqueuing them in the
* ready list.
*/
REGISTER Process *CurrentProcess;
-#if CONFIG_KERN_PREEMPTIVE
-/*
- * The time sharing scheduler forces a task switch when the current
- * process has exhausted its quantum.
- */
-uint16_t Quantum;
-#endif
-
-
#if (ARCH & ARCH_EMUL)
/*
* In hosted environments, we must emulate the stack on the real process stack.
}
-/**
- * System scheduler: pass CPU control to the next process in
- * the ready queue.
- */
-void proc_schedule(void)
-{
- struct Process *old_process;
- cpuflags_t flags;
-
- ATOMIC(LIST_ASSERT_VALID(&ProcReadyList));
- ASSERT_USER_CONTEXT();
- ASSERT_IRQ_ENABLED();
-
- /* Remember old process to save its context later */
- old_process = CurrentProcess;
-
- /* Poll on the ready queue for the first ready process */
- IRQ_SAVE_DISABLE(flags);
- 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.
- * \todo If there was a way to write sig_wait() so that it does not
- * disable interrupts while waiting, there would not be any
- * reason to do this.
- */
- IRQ_ENABLE;
- CPU_IDLE;
- MEMORY_BARRIER;
- IRQ_DISABLE;
- }
- IRQ_RESTORE(flags);
-
- /*
- * Optimization: don't switch contexts when the active
- * process has not changed.
- */
- if (CurrentProcess != old_process)
- {
- cpustack_t *dummy;
-
- #if CONFIG_KERN_MONITOR
- LOG_INFO("Switch from %p(%s) to %p(%s)\n",
- old_process, old_process ? old_process->monitor.name : "NONE",
- CurrentProcess, CurrentProcess->monitor.name);
- #endif
-
- #if CONFIG_KERN_PREEMPTIVE
- /* Reset quantum for this process */
- Quantum = CONFIG_KERN_QUANTUM;
- #endif
-
- /* Save context of old process and switch to new process. If there is no
- * old process, we save the old stack pointer into a dummy variable that
- * we ignore. In fact, this happens only when the old process has just
- * exited.
- * TODO: Instead of physically clearing the process at exit time, a zombie
- * list should be created.
- */
- asm_switch_context(&CurrentProcess->stack, old_process ? &old_process->stack : &dummy);
- }
-
- /* This RET resumes the execution on the new process */
-}
-
-
/**
* Terminate the current process
*/
}
-/**
- * Co-operative context switch
- */
-void proc_switch(void)
-{
- ATOMIC(SCHED_ENQUEUE(CurrentProcess));
-
- proc_schedule();
-}
-
-
/**
* Get the pointer to the current process
*/
{
return CurrentProcess->user_data;
}
-
-
-#if CONFIG_KERN_PREEMPTIVE
-
-/**
- * Disable preemptive task switching.
- *
- * 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;
-}
-
-#endif /* CONFIG_KERN_PREEMPTIVE */
* \brief Internal scheduler structures and definitions for processes.
*
* \version $Id$
- *
* \author Bernie Innocenti <bernie@codewiz.org>
*/
#endif /* CONFIG_KERN_MONITOR */
#endif /* KERN_PROC_P_H */
-
* How can we fix this?
*/
#include TEST_ONLY(drv/kdebug.c)
+#include TEST_ONLY(kern/coop.c)
#include TEST_ONLY(kern/proc.c)
#include TEST_ONLY(drv/timer.c)
#include TEST_ONLY(mware/formatwr.c)
projects / bertos.git / commitdiff