hobbielektronika
Example of mutex usage to protect shared access to stdio (printf). Note that this kind of protection is needed in case of Cortex-M0 MCU-s which use C microlib. Larger MCUs (like Cortex M3), however, use the C stdlib which already provides a mutex to protect access to stdio.
Diff: main.cpp
- Revision:
- 0:6d2b4755a904
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Feb 10 13:03:43 2016 +0000
@@ -0,0 +1,30 @@
+/** 10_rtos_mutex
+ * Example of mutex usage to protect shared access to stdio (printf).
+ * Note that this kind of protection is needed in case of Cortex-M0 MCU-s
+ * which use C microlib. Larger MCUs (like Cortex M3), however, use
+ * the C stdlib which already provides a mutex to protect access to stdio.
+ */
+
+#include "mbed.h"
+#include "rtos.h"
+
+Mutex stdio_mutex;
+
+void notify(const char* name, int state) {
+ stdio_mutex.lock();
+ printf("%s: %d\n\r", name, state);
+ stdio_mutex.unlock();
+}
+
+void test_thread(void const *args) {
+ while (true) {
+ notify((const char*)args, 0); Thread::wait(1000);
+ notify((const char*)args, 1); Thread::wait(1000);
+ }
+}
+
+int main() {
+ Thread t2(test_thread, (void *)"Th 2");
+ Thread t3(test_thread, (void *)"Th 3");
+ test_thread((void *)"Th 1");
+}