Mercurial Mercurial > matiec / file revision
summary | shortlog | changelog | graph | tags | bookmarks | branches | files | changeset | file | latest | revisions | annotate | diff | comparison | raw | help
lib/sema.txt
author Mario de Sousa <msousa@fe.up.pt>
Wed, 26 Dec 2018 11:51:58 +0000
changeset 1081 d8ed548e2f9b
parent 251 5e7457efbb8f
permissions -rw-r--r--
return storage of task interval back to 1 ns resolution (when calculating least common multiple et. al. of task intervals). 
(*
 * (c) 2011 Edouard Tisserant
 *
 * Fake semaphore support, for non preemptive implementation.
 *
 *)


FUNCTION_BLOCK SEMA
  VAR_INPUT
    CLAIM : BOOL;
    RELEASE : BOOL;
  END_VAR
  VAR_OUTPUT
    BUSY : BOOL;
  END_VAR
  VAR
    Q_INTERNAL : BOOL;
  END_VAR

  Q_INTERNAL := CLAIM OR ( Q_INTERNAL AND (NOT RELEASE));
  BUSY := Q_INTERNAL;

END_FUNCTION_BLOCK
matiec