From 69aead513de2f646a186eaacc40fa7c5a3ef5db2 Mon Sep 17 00:00:00 2001 From: Cristian Maglie Date: Fri, 2 Nov 2012 18:12:21 +0100 Subject: Added general yield()-hook for cooperative scheduling development (part 2) --- cores/arduino/hooks.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 cores/arduino/hooks.c (limited to 'cores/arduino/hooks.c') diff --git a/cores/arduino/hooks.c b/cores/arduino/hooks.c new file mode 100644 index 0000000..641eabc --- /dev/null +++ b/cores/arduino/hooks.c @@ -0,0 +1,31 @@ +/* + Copyright (c) 2012 Arduino. All right reserved. + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + See the GNU Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +*/ + +/** + * Empty yield() hook. + * + * This function is intended to be used by library writers to build + * libraries or sketches that supports cooperative threads. + * + * Its defined as a weak symbol and it can be redefined to implement a + * real cooperative scheduler. + */ +static void __empty() { + // Empty +} +void yield(void) __attribute__ ((weak, alias("__empty"))); -- cgit v1.2.3-18-g5258