X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Fcfg%2Fos.h;h=2089cc4fc1e977b69333b09ce7214a9d1339d12f;hb=32d1445272120a254d77ce8d1af1f527da7a2c17;hp=4630377e9eae19774e99197689bd8d81d77ea7ba;hpb=fe0a14d1434098bfd0780d06a2a7e55f27940d27;p=bertos.git

diff --git a/bertos/cfg/os.h b/bertos/cfg/os.h
index 4630377e..2089cc4f 100644
--- a/bertos/cfg/os.h
+++ b/bertos/cfg/os.h
@@ -39,6 +39,8 @@
 #ifndef CFG_OS_H
 #define CFG_OS_H
 
+#include "cfg/cfg_proc.h"
+
 /*
  * OS autodetection (Some systems trigger multiple OS definitions)
  */
@@ -109,6 +111,40 @@
 		sigismember(&sigs__, SIGALRM) ? false : true; \
 	 })
 
+	#if 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