mbed_error: Print thread names

As part of this, don't show empty current thread info in non-RTOS
build.

Author: kjbracey

platform/mbed_error.c

@@ -270,11 +270,16 @@ mbed_error_status_t mbed_clear_all_errors(void)
     return status;
 }
 
+static const char *name_or_unnamed(const char *name)
+{
+    return name ? name : "<unnamed>";
+}
+
 #if MBED_CONF_PLATFORM_ERROR_ALL_THREADS_INFO && defined(MBED_CONF_RTOS_PRESENT)
 /* Prints info of a thread(using osRtxThread_t struct)*/
 static void print_thread(const osRtxThread_t *thread)
 {
-    mbed_error_printf("\nState: 0x%08X Entry: 0x%08X Stack Size: 0x%08X Mem: 0x%08X SP: 0x%08X", thread->state, thread->thread_addr, thread->stack_size, (uint32_t)thread->stack_mem, thread->sp);
+    mbed_error_printf("\n%s  State: 0x%X Entry: 0x%08X Stack Size: 0x%08X Mem: 0x%08X SP: 0x%08X", name_or_unnamed(thread->name), thread->state, thread->thread_addr, thread->stack_size, (uint32_t)thread->stack_mem, thread->sp);
 }
 
 /* Prints thread info from a list */
@@ -348,8 +353,11 @@ static void print_error_report(mbed_error_ctx *ctx, const char *error_msg)
 #endif
 
     mbed_error_printf("\nError Value: 0x%X", ctx->error_value);
-    mbed_error_printf("\nCurrent Thread: Id: 0x%X Entry: 0x%X StackSize: 0x%X StackMem: 0x%X SP: 0x%X ",
+#ifdef MBED_CONF_RTOS_PRESENT
+    mbed_error_printf("\nCurrent Thread: %s  Id: 0x%X Entry: 0x%X StackSize: 0x%X StackMem: 0x%X SP: 0x%X ",
+                      name_or_unnamed(((osRtxThread_t *)ctx->thread_id)->name),
                       ctx->thread_id, ctx->thread_entry_address, ctx->thread_stack_size, ctx->thread_stack_mem, ctx->thread_current_sp);
+#endif
 
 #if MBED_CONF_PLATFORM_ERROR_ALL_THREADS_INFO && defined(MBED_CONF_RTOS_PRESENT)
     mbed_error_printf("\nNext:");