diff options
author | Martin Sustrik <sustrik@fastmq.commkdir> | 2009-07-29 12:07:54 +0200 |
---|---|---|
committer | Martin Sustrik <sustrik@fastmq.commkdir> | 2009-07-29 12:07:54 +0200 |
commit | 4ed70a930202b103e7e80b8dc925e0aaa4622595 (patch) | |
tree | aeed881ce17629f81b7c90f7d675aac8ecf69d4f /src/ypollset.hpp |
initial commit
Diffstat (limited to 'src/ypollset.hpp')
-rw-r--r-- | src/ypollset.hpp | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/src/ypollset.hpp b/src/ypollset.hpp new file mode 100644 index 0000000..7c71152 --- /dev/null +++ b/src/ypollset.hpp @@ -0,0 +1,74 @@ +/* + Copyright (c) 2007-2009 FastMQ Inc. + + This file is part of 0MQ. + + 0MQ is free software; you can redistribute it and/or modify it under + the terms of the Lesser GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + 0MQ 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 + Lesser GNU General Public License for more details. + + You should have received a copy of the Lesser GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#ifndef __ZS_YPOLLSET_HPP_INCLUDED__ +#define __ZS_YPOLLSET_HPP_INCLUDED__ + +#include "i_signaler.hpp" +#include "simple_semaphore.hpp" +#include "atomic_bitmap.hpp" + +namespace zs +{ + + // ypollset allows for rapid polling for up to constant number of + // different signals each produced by a different thread. The number of + // possible signals is platform-dependent. + + class ypollset_t : public i_signaler + { + public: + + typedef atomic_bitmap_t::bitmap_t signals_t; + + // Create the pollset. + ypollset_t (); + + // Send a signal to the pollset (i_singnaler implementation). + void signal (int signal_); + + // Wait for signal. Returns a set of signals in form of a bitmap. + // Signal with index 0 corresponds to value 1, index 1 to value 2, + // index 2 to value 3 etc. + signals_t poll (); + + // Same as poll, however, if there is no signal available, + // function returns zero immediately instead of waiting for a signal. + signals_t check (); + + private: + + // Wait signal is carried in the most significant bit of integer. + enum {wait_signal = sizeof (signals_t) * 8 - 1}; + + // The bits of the pollset. + atomic_bitmap_t bits; + + // Used by thread waiting for signals to sleep if there are no + // signals available. + simple_semaphore_t sem; + + // Disable copying of ypollset object. + ypollset_t (const ypollset_t&); + void operator = (const ypollset_t&); + }; + +} + +#endif |