Add priority inheritance implementation for Semaphores.

[bertos.git] / bertos / kern / proc_p.h

diff --git a/bertos/kern/proc_p.h b/bertos/kern/proc_p.h
index 56c810819b56964d2d16c83fe29075fbde8f3e5b..2b6855497da888086d113da6569ff19a7c61b0af 100644 (file)
--- a/bertos/kern/proc_p.h
+++ b/bertos/kern/proc_p.h
@@ -33,7 +33,6 @@
  *
  * \brief Internal scheduler structures and definitions for processes.
  *
- * \version $Id$
  * \author Bernie Innocenti <bernie@codewiz.org>
  */
 
@@ -50,19 +49,6 @@
 
 #include <kern/proc.h>   // struct Process
 
-/*
- * Check if the process context switch can be performed directly by the
- * architecture-dependent asm_switch_context() or if it must be delayed
- * because we're in the middle of an ISR.
- *
- * Return true if asm_switch_context() can be executed, false
- * otherwise.
- *
- * NOTE: if an architecture does not implement IRQ_RUNNING() this function
- * always returns true.
- */
-#define CONTEXT_SWITCH_FROM_ISR()      (!IRQ_RUNNING())
-
 #ifndef asm_switch_context
 /**
  * CPU dependent context switching routines.
@@ -73,23 +59,6 @@
 EXTERN_C void asm_switch_context(cpu_stack_t **new_sp, cpu_stack_t **save_sp);
 #endif
 
-/*
- * Save context of old process and switch to new process.
-  */
-INLINE void proc_switchTo(Process *next, Process *prev)
-{
-       cpu_stack_t *dummy;
-
-       if (UNLIKELY(next == prev))
-               return;
-       /*
-        * 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.
-        */
-       asm_switch_context(&next->stack, prev ? &prev->stack : &dummy);
-}
-
 /**
  * \name Flags for Process.flags.
  * \{
@@ -109,6 +78,13 @@ extern REGISTER Process     *current_process;
 extern REGISTER List     proc_ready_list;
 
 #if CONFIG_KERN_PRI
+# if CONFIG_KERN_PRI_INHERIT
+       #define __prio_orig(proc) (proc->orig_pri)
+       #define __prio_inh(proc) (LIST_EMPTY(&(proc)->inh_list) ? INT_MIN : \
+                                       ((PriNode *)LIST_HEAD(&proc->inh_list))->pri)
+       #define __prio_proc(proc) (__prio_inh(proc) > __prio_orig(proc) ? \
+                                       __prio_inh(proc) : __prio_orig(proc))
+# endif
        #define prio_next()     (LIST_EMPTY(&proc_ready_list) ? INT_MIN : \
                                        ((PriNode *)LIST_HEAD(&proc_ready_list))->pri)
        #define prio_proc(proc) (proc->link.pri)
@@ -191,11 +167,8 @@ void proc_entry(void);
 /* Schedule another process *without* adding the current one to the ready list. */
 void proc_switch(void);
 
-/* Low level scheduling routine. */
-void proc_schedule(void);
-
-/* Low level context switch routine. */
-void proc_switchTo(Process *next, Process *prev);
+/* Immediately schedule a particular process bypassing the scheduler. */
+void proc_wakeup(Process *proc);
 
 /* Initialize a scheduler class. */
 void proc_schedInit(void);
@@ -214,4 +187,43 @@ void proc_schedInit(void);
        void monitor_rename(Process *proc, const char *name);
 #endif /* CONFIG_KERN_MONITOR */
 
+/*
+ * Quantum related macros are used in the
+ * timer module and must be empty when
+ * kernel is disabled.
+ */
+#if (CONFIG_KERN && CONFIG_KERN_PREEMPT)
+INLINE int preempt_quantum(void)
+{
+       extern int _proc_quantum;
+       return _proc_quantum;
+}
+
+INLINE void proc_decQuantum(void)
+{
+       extern int _proc_quantum;
+       if (_proc_quantum > 0)
+               _proc_quantum--;
+}
+
+INLINE void preempt_reset_quantum(void)
+{
+       extern int _proc_quantum;
+       _proc_quantum = CONFIG_KERN_QUANTUM;
+}
+#else /* !(CONFIG_KERN && CONFIG_KERN_PREEMPT) */
+INLINE int preempt_quantum(void)
+{
+       return 0;
+}
+
+INLINE void proc_decQuantum(void)
+{
+}
+
+INLINE void preempt_reset_quantum(void)
+{
+}
+#endif /* (CONFIG_KERN && CONFIG_KERN_PREEMPT) */
+
 #endif /* KERN_PROC_P_H */