X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Fcfg%2Fos.h;h=36e11eb5e9d4d85bbb5998955bf021f74d7ad6c6;hb=b9e1e52093d33494bf4a8ca27c14a56a25b6e0bc;hp=4630377e9eae19774e99197689bd8d81d77ea7ba;hpb=76c6d43c05630ad4b3a9c86f99a2b9e7c835272a;p=bertos.git

diff --git a/bertos/cfg/os.h b/bertos/cfg/os.h
index 4630377e..36e11eb5 100644
--- a/bertos/cfg/os.h
+++ b/bertos/cfg/os.h
@@ -32,13 +32,14 @@
  *
  * \brief OS-specific definitions
  *
- * \version $Id$
  * \author Bernie Innocenti <bernie@codewiz.org>
  */
 
 #ifndef CFG_OS_H
 #define CFG_OS_H
 
+#include "cfg/cfg_proc.h"
+
 /*
  * OS autodetection (Some systems trigger multiple OS definitions)
  */
@@ -109,6 +110,40 @@
 		sigismember(&sigs__, SIGALRM) ? false : true; \
 	 })
 
+	#if (CONFIG_KERN && CONFIG_KERN_PREEMPT)
+		#define DECLARE_ISR_CONTEXT_SWITCH(vect)	\
+			void vect(UNUSED_ARG(int, arg));	\
+			INLINE void __isr_##vect(void);		\
+			void vect(UNUSED_ARG(int, arg))		\
+			{					\
+				__isr_##vect();			\
+				IRQ_PREEMPT_HANDLER();		\
+			}					\
+			INLINE void __isr_##vect(void)
+		/**
+		 * With task priorities enabled each ISR is used a point to
+		 * check if we need to perform a context switch.
+		 *
+		 * Instead, without priorities a context switch can occur only
+		 * when the running task expires its time quantum. In this last
+		 * case, the context switch can only occur in the timer ISR,
+		 * that must be always declared with the
+		 * DECLARE_ISR_CONTEXT_SWITCH() macro.
+		 */
+		#if CONFIG_KERN_PRI
+			#define DECLARE_ISR(vect) \
+				DECLARE_ISR_CONTEXT_SWITCH(vect)
+		#endif /* CONFIG_KERN_PRI */
+	#endif
+	#ifndef DECLARE_ISR
+		#define DECLARE_ISR(vect) \
+				void vect(UNUSED_ARG(int, arg))
+	#endif
+	#ifndef DECLARE_ISR_CONTEXT_SWITCH
+		#define DECLARE_ISR_CONTEXT_SWITCH(vect) \
+				void vect(UNUSED_ARG(int, arg))
+	#endif
+
 #else
 	#define OS_UNIX   0
 	#define OS_POSIX  0