Backported customer CR.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/stable_2.2.x@2962 35acf78f-673a-0410-8e92-d51de3d6d3f4

demos/ARM7-AT91SAM7S-FATFS-GCC/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/ARM7-AT91SAM7S-GCC/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/ARM7-AT91SAM7X-FATFS-GCC/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/ARM7-AT91SAM7X-GCC/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/ARM7-AT91SAM7X-LWIP-GCC/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/ARM7-AT91SAM7X-UIP-GCC/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/ARM7-LPC214x-FATFS-GCC/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/ARM7-LPC214x-G++/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/ARM7-LPC214x-GCC/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/ARMCM0-LPC1114-LPCXPRESSO/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/ARMCM3-LPC1343-LPCXPRESSO/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/ARMCM3-STM32F100-DISCOVERY/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/ARMCM3-STM32F103-FATFS-GCC/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/ARMCM3-STM32F103/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/ARMCM3-STM32F107-GCC/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/AVR-AT90CANx-GCC/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 128
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/AVR-ATmega128-GCC/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 128
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/MSP430-MSP430x1611-GCC/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 512
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/PPC-SPC563-GCC/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/Posix-GCC/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0x20000
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/STM8L-STM8L152-DISCOVERY-STVD/demo/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 128
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/STM8S-STM8S105-DISCOVERY-STVD/demo/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 128
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/STM8S-STM8S208-RC/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 128
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

demos/Win32-MinGW/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0x20000
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

os/kernel/include/chsys.h

@@ -35,8 +35,11 @@
 #ifndef _CHSYS_H_
 #define _CHSYS_H_
 
+#if !CH_NO_IDLE_THREAD || defined(__DOXYGEN__)
 /**
  * @brief   Returns a pointer to the idle thread.
+ * @pre     In order to use this function the option @p CH_NO_IDLE_THREAD
+ *          must be disabled.
  * @note    The reference counter of the idle thread is not incremented but
  *          it is not strictly required being the idle thread a static
  *          object.
@@ -46,6 +49,7 @@
  * @api
  */
 #define chSysGetIdleThread() ((Thread *)_idle_thread_wa)
+#endif
 
 /**
  * @brief   Halts the system.

os/kernel/src/chsys.c

@@ -41,6 +41,7 @@
 
 #include "ch.h"
 
+#if !CH_NO_IDLE_THREAD || defined(__DOXYGEN__)
 /**
  * @brief   Idle thread working area.
  * @see     IDLE_THREAD_STACK_SIZE
@@ -65,6 +66,7 @@ void _idle_thread(void *p) {
     IDLE_LOOP_HOOK();
   }
 }
+#endif /* CH_NO_IDLE_THREAD */
 
 /**
  * @brief   ChibiOS/RT initialization.
@@ -99,11 +101,13 @@ void chSysInit(void) {
   currp->p_state = THD_STATE_CURRENT;
   chSysEnable();
 
+#if !CH_NO_IDLE_THREAD
   /* This thread has the lowest priority in the system, its role is just to
      serve interrupts in its context while keeping the lowest energy saving
      mode compatible with the system status.*/
   chThdCreateStatic(_idle_thread_wa, sizeof(_idle_thread_wa), IDLEPRIO,
                     (tfunc_t)_idle_thread, NULL);
+#endif
 }
 
 /**

os/kernel/src/chthreads.c

@@ -212,8 +212,7 @@ Thread *chThdCreateStatic(void *wsp, size_t size,
 tprio_t chThdSetPriority(tprio_t newprio) {
   tprio_t oldprio;
 
-  chDbgCheck((newprio >= LOWPRIO) && (newprio <= HIGHPRIO),
+  chDbgCheck(newprio <= HIGHPRIO, "chThdSetPriority");
-              "chThdSetPriority");
 
   chSysLock();
 #if CH_USE_MUTEXES

os/kernel/templates/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

readme.txt

@@ -78,6 +78,9 @@
   applied the same fix to the STM8S SPI driver (bug 3288758).
 - FIX: Fixed missing state transition in ADC driver (bug 3288149).
 - FIX: Fixed missing state transition in SPI driver (bug 3288112).
+- NEW: Added an option to the kernel to not spawn the Idle Thread from within
+  chSysInit(), this way the application can spawn a custom idle thread or
+  even use the main() thread as idle thread.
 
 *** 2.2.3 ***
 - FIX: Fixed insufficient idle thread stack in Cortex-M0-GCC port

test/coverage/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0x20000
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

testhal/STM32/ADC/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

testhal/STM32/CAN/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

testhal/STM32/PWM/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

testhal/STM32/SPI/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

testhal/STM32/UART/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 0
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/

testhal/STM8S/SPI/demo/chconf.h

@@ -96,6 +96,23 @@
 #define CH_MEMCORE_SIZE                 128
 #endif
 
+/**
+ * @brief   Idle thread automatic spawn suppression.
+ * @details When this option is activated the function @p chSysInit()
+ *          does not spawn the idle thread automatically. The application has
+ *          then the responsibility to do one of the following:
+ *          - Spawn a custom idle thread at priority @p IDLEPRIO.
+ *          - Change the main() thread priority to @p IDLEPRIO then enter
+ *            an endless loop. In this scenario the @p main() thread acts as
+ *            the idle thread.
+ *          .
+ * @note    Unless an idle thread is spawned the @p main() thread must not
+ *          enter a sleep state.
+ */
+#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
+#define CH_NO_IDLE_THREAD               FALSE
+#endif
+
 /*===========================================================================*/
 /* Performance options.                                                      */
 /*===========================================================================*/