core/msg: re-enable IRQs before printing for highlevel_stdio

core/include/msg.h

@@ -411,8 +411,17 @@ unsigned msg_queue_capacity(kernel_pid_t pid);
  */
 void msg_init_queue(msg_t *array, int num);
 
+/**
+ * @brief Number of messages to be maximally printed through @ref msg_queue_print
+ */
+#ifndef CONFIG_MSG_QUEUE_PRINT_MAX
+#  define CONFIG_MSG_QUEUE_PRINT_MAX 16U
+#endif
+
 /**
  * @brief   Prints the message queue of the current thread.
+ *
+ * @note    Prints at most CONFIG_MSG_QUEUE_PRINT_MAX messages.
  */
 void msg_queue_print(void);
 

core/msg.c

@@ -21,8 +21,10 @@
  */
 
 #include <stddef.h>
+#include <string.h>
 #include <inttypes.h>
 #include <assert.h>
+#include "macros/utils.h"
 #include "sched.h"
 #include "msg.h"
 #include "msg_bus.h"
@@ -495,26 +497,50 @@ void msg_queue_print(void)
     unsigned state = irq_disable();
     thread_t *thread = thread_get_active();
 
-    unsigned msg_counter = msg_avail();
+    unsigned msg_count = msg_avail();
 
-    if (msg_counter < 1) {
+    if (msg_count < 1) {
         /* no msg queue */
         irq_restore(state);
         printf("No messages or no message queue\n");
         return;
     }
+
     cib_t *msg_queue = &thread->msg_queue;
-    msg_t *msg_array = thread->msg_array;
-    int first_msg = cib_peek(msg_queue);
+
+    /* copy message queue information to stack
+       before re-enabling IRQs (needed for highlevel_stdio) */
+    unsigned size = msg_queue->mask + 1;
+    unsigned msg_count_print = MIN(msg_count, CONFIG_MSG_QUEUE_PRINT_MAX);
+    int msg_idx_first = cib_peek(msg_queue);
+    int msg_idx_last = (msg_idx_first + msg_count) & msg_queue->mask;
+    unsigned msg_count_to_end = size - msg_idx_first;
+
+    static msg_t msg_array[CONFIG_MSG_QUEUE_PRINT_MAX];
+    if (msg_idx_last > msg_idx_first || msg_count_to_end > msg_count_print) {
+        memcpy(msg_array, &thread->msg_array[msg_idx_first],
+               sizeof(msg_t) * (msg_count_print));
+    }
+    else {
+        unsigned msg_count_from_start = MIN((unsigned)(msg_idx_last + 1),
+                                            msg_count_print - msg_count_to_end);
+        memcpy(&msg_array[0], &thread->msg_array[msg_idx_first],
+               sizeof(msg_t) * msg_count_to_end);
+        memcpy(&msg_array[msg_count_to_end], &thread->msg_array[0],
+               sizeof(msg_t) * msg_count_from_start);
+    }
+    irq_restore(state);
 
     printf("Message queue of thread %" PRIkernel_pid "\n", thread->pid);
-    printf("    size: %u (avail: %u)\n", msg_queue->mask + 1, msg_counter);
+    printf("    size: %u (avail: %u)\n", size, msg_count);
 
-    for (unsigned i = 0; i < msg_counter; i++) {
-        msg_t *m = &msg_array[(first_msg + i) & msg_queue->mask];
-        printf("    * %u: sender: %" PRIkernel_pid ", type: 0x%04" PRIu16
+    for (unsigned i = 0; i < msg_count_print; i++) {
+        msg_t *m = &msg_array[i];
+        printf("    * %u: sender: %" PRIkernel_pid ", type: 0x%04" PRIx16
                ", content: %" PRIu32 " (%p)\n", i, m->sender_pid, m->type,
                m->content.value, m->content.ptr);
     }
-    irq_restore(state);
+    if (msg_count > msg_count_print) {
+        puts("    ... (print more by changing CONFIG_MSG_QUEUE_PRINT_MAX)");
+    }
 }

tests/core/msg_queue_print/Makefile

@@ -1,3 +1,10 @@
 include ../Makefile.core_common
 
+CONFIG_MSG_QUEUE_PRINT_MAX ?= 6
+
+CFLAGS += -DCONFIG_MSG_QUEUE_PRINT_MAX=$(CONFIG_MSG_QUEUE_PRINT_MAX)
+
 include $(RIOTBASE)/Makefile.include
+
+# Make config available in Python test script via environment variables
+export CONFIG_MSG_QUEUE_PRINT_MAX

tests/core/msg_queue_print/main.c

@@ -1,5 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin,
+ * Copyright (C) 2021 Freie Universität Berlin
+ * Copyright (C) 2024 TU Dresden
  *
  * This file is subject to the terms and conditions of the GNU Lesser
  * General Public License v2.1. See the file LICENSE in the top level
@@ -15,6 +16,7 @@
  *
  *
  * @author      Julian Holzwarth <[email protected]>
+ * @author      Mikolai Gütschow <[email protected]>
  *
  */
 
@@ -29,19 +31,37 @@ msg_t msg_queue[QUEUE_SIZE];
 
 int main(void)
 {
-    msg_t messages[QUEUE_SIZE];
+    msg_t msg;
 
     msg_queue_print();
     msg_init_queue(msg_queue, QUEUE_SIZE);
     msg_queue_print();
 
+    /* fill message queue */
     for (uintptr_t i = 0; i < QUEUE_SIZE; i++) {
-        messages[i].type = i;
-        messages[i].content.ptr = (void *) i;
-        msg_send_to_self(&messages[i]);
+        msg.type = i;
+        msg.content.ptr = (void *) i;
+        msg_send_to_self(&msg);
     }
 
     msg_queue_print();
+
+    /* drain half of message queue */
+    for (uintptr_t i = 0; i < QUEUE_SIZE/2; i++) {
+        msg_receive(&msg);
+    }
+
+    msg_queue_print();
+
+    /* fill up message queue again */
+    for (uintptr_t i = QUEUE_SIZE; i < QUEUE_SIZE + QUEUE_SIZE/2; i++) {
+        msg.type = i;
+        msg.content.ptr = (void *) i;
+        msg_send_to_self(&msg);
+    }
+
+    msg_queue_print();
+
     puts("DONE");
     return 0;
 }

tests/core/msg_queue_print/tests/01-run.py

@@ -1,34 +1,60 @@
 #!/usr/bin/env python3
 
-#  Copyright (C) 2021 Freie Universität Berlin,
+#  Copyright (C) 2021 Freie Universität Berlin
+#  Copyright (C) 2024 TU Dresden
 #
 # This file is subject to the terms and conditions of the GNU Lesser
 # General Public License v2.1. See the file LICENSE in the top level
 # directory for more details.
 
 # @author      Julian Holzwarth <[email protected]>
+# @author      Mikolai Gütschow <[email protected]>
 
 import os
 import sys
 from testrunner import run
 
+PRINT_MAX = int(os.getenv('CONFIG_MSG_QUEUE_PRINT_MAX'))
 
-def testfunc(child):
-    child.expect("No messages or no message queue")
+
+def expect_none(child):
     child.expect("No messages or no message queue")
+
+
+def expect_some(child, size, avail, range_start):
     child.expect(r"Message queue of thread \d+\r\n")
-    child.expect_exact('size: 8 (avail: 8)')
-    if os.environ.get('BOARD') in ['native', 'native64']:
-        child.expect_exact('type: 0x0000, content: 0 ((nil))')
+    child.expect_exact(f'size: {size} (avail: {avail})')
+
+    expect_less = avail > PRINT_MAX
+
+    if expect_less:
+        range_end = range_start + PRINT_MAX
     else:
-        child.expect(r'type: 0x0000, content: 0 \((0x)?0+\)')
-    child.expect_exact('type: 0x0001, content: 1 (0x1)')
-    child.expect_exact('type: 0x0002, content: 2 (0x2)')
-    child.expect_exact('type: 0x0003, content: 3 (0x3)')
-    child.expect_exact('type: 0x0004, content: 4 (0x4)')
-    child.expect_exact('type: 0x0005, content: 5 (0x5)')
-    child.expect_exact('type: 0x0006, content: 6 (0x6)')
-    child.expect_exact('type: 0x0007, content: 7 (0x7)')
+        range_end = range_start + avail
+
+    for counter in range(range_start, range_end):
+        expect_content(child, counter)
+
+    if expect_less:
+        child.expect('...')
+
+
+def expect_content(child, counter):
+    if counter == 0:
+        if os.environ.get('BOARD') in ['native', 'native64']:
+            child.expect_exact('type: 0x0000, content: 0 ((nil))')
+        else:
+            child.expect(r'type: 0x0000, content: 0 \((0x)?0+\)')
+    else:
+        child.expect_exact(f'type: 0x{counter:04x}, content: {counter} (0x{counter:x})')
+
+
+def testfunc(child):
+    expect_none(child)
+    expect_none(child)
+    expect_some(child, 8, 8, 0)
+    expect_some(child, 8, 4, 4)
+    expect_some(child, 8, 8, 4)
     child.expect_exact('DONE')