core: make messaging optional

Author: kaspar030

Makefile.defaultmodules

@@ -1,3 +1,3 @@
-DEFAULT_MODULE += board cpu core sys
+DEFAULT_MODULE += board cpu core core_msg sys
 
 DEFAULT_MODULE += auto_init

Makefile.pseudomodules

@@ -2,6 +2,7 @@ PSEUDOMODULES += conn
 PSEUDOMODULES += conn_ip
 PSEUDOMODULES += conn_tcp
 PSEUDOMODULES += conn_udp
+PSEUDOMODULES += core_msg
 PSEUDOMODULES += core_thread_flags
 PSEUDOMODULES += gnrc_netdev_default
 PSEUDOMODULES += gnrc_ipv6_default

core/include/msg.h

@@ -375,6 +375,11 @@ int msg_avail(void);
  */
 int msg_init_queue(msg_t *array, int num);
 
+/**
+ * @brief   Prints the message queue of the current thread.
+ */
+void msg_queue_print(void);
+
 #ifdef __cplusplus
 }
 #endif

core/include/thread.h

@@ -85,11 +85,14 @@ struct _thread {
 
     clist_node_t rq_entry;          /**< run queue entry                */
 
-    void *wait_data;                /**< holding messages               */
+#if defined(MODULE_CORE_MSG) || defined(MODULE_CORE_THREAD_FLAGS)
+    void *wait_data;                /**< used by msg and thread flags   */
+#endif
+#if defined(MODULE_CORE_MSG)
     priority_queue_t msg_waiters;   /**< threads waiting on message     */
-
     cib_t msg_queue;                /**< message queue                  */
     msg_t *msg_array;               /**< memory holding messages        */
+#endif
 
 #if defined DEVELHELP || defined(SCHED_TEST_STACK)
     char *stack_start;              /**< thread's stack start address   */
@@ -321,11 +324,6 @@ static inline kernel_pid_t thread_getpid(void)
  */
 char *thread_stack_init(thread_task_func_t task_func, void *arg, void *stack_start, int stack_size);
 
-/**
- * @brief   Prints the message queue of the current thread.
- */
-void thread_print_msg_queue(void);
-
 /**
  * @brief Add thread to list, sorted by priority (internal)
  *

core/msg.c

@@ -34,6 +34,8 @@
 #include "debug.h"
 #include "thread.h"
 
+#ifdef MODULE_CORE_MSG
+
 static int _msg_receive(msg_t *m, int block);
 static int _msg_send(msg_t *m, kernel_pid_t target_pid, bool block, unsigned state);
 
@@ -389,3 +391,29 @@ int msg_init_queue(msg_t *array, int num)
 
     return -1;
 }
+
+void msg_queue_print(void)
+{
+    unsigned state = irq_disable();
+
+    thread_t *thread =(thread_t *)sched_active_thread;
+    cib_t *msg_queue = &thread->msg_queue;
+    msg_t *msg_array = thread->msg_array;
+    unsigned int i = msg_queue->read_count & msg_queue->mask;
+
+    printf("Message queue of thread %" PRIkernel_pid "\n", thread->pid);
+    printf("    size: %u (avail: %d)\n", msg_queue->mask + 1,
+           cib_avail((cib_t *)msg_queue));
+
+    for (; i != (msg_queue->write_count & msg_queue->mask);
+         i = (i + 1) & msg_queue->mask) {
+        msg_t *m = &msg_array[i];
+        printf("    * %u: sender: %" PRIkernel_pid ", type: 0x%04" PRIu16
+               ", content: %" PRIu32 " (%p)\n", i, m->sender_pid, m->type,
+               m->content.value, (void *)m->content.ptr);
+    }
+
+    irq_restore(state);
+}
+
+#endif /* MODULE_CORE_MSG */

core/thread.c

@@ -225,12 +225,12 @@ kernel_pid_t thread_create(char *stack, int stacksize, char priority, int flags,
 
     cb->rq_entry.next = NULL;
 
+#ifdef MODULE_CORE_MSG
     cb->wait_data = NULL;
-
     cb->msg_waiters.first = NULL;
-
     cib_init(&(cb->msg_queue), 0);
     cb->msg_array = NULL;
+#endif
 
     sched_num_threads++;
 

core/thread_print_msg_queue.c

@@ -36,6 +36,11 @@ QUIET ?= 1
 #USEMODULE += posix
 #USEMODULE += xtimer
 
+# If your application is very simple and doesn't use modules that use
+# messaging, it can be disabled to save some memory:
+
+#DISABLE_MODULE += core_msg
+
 #export INCLUDES += -Iapplication_include
 
 # Specify custom dependencies for your application here ...

dist/Makefile

@@ -1,7 +1,12 @@
 APPLICATION = sizeof_tcb
 include ../Makefile.tests_common
 
-# optional thread_t modifying modules:
+# othread_t modifying modules:
+#
+# disabled by default:
 # USEMODULE += core_thread_flags
+#
+# enabled by defaule:
+# DISABLE_MODULE += core_msg
 
 include $(RIOTBASE)/Makefile.include

tests/sizeof_tcb/Makefile

@@ -39,10 +39,12 @@ int main(void)
     P(flags);
 #endif
     P(rq_entry);
+#ifdef MODULE_CORE_MSG
     P(wait_data);
     P(msg_waiters);
     P(msg_queue);
     P(msg_array);
+#endif
 #ifdef DEVELHELP
     P(name);
 #endif