110 lines
3.5 KiB
C++
110 lines
3.5 KiB
C++
/* signal_node.h -*-C++-*-
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*
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*************************************************************************
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*
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* @copyright
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* Copyright (C) 2009-2013, Intel Corporation
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* All rights reserved.
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*
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* @copyright
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* @copyright
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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**************************************************************************/
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/**
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* @file signal_node.h
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*
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* @brief Signal nodes allow coordinated waking and sleeping of the runtime
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* without hammering on a single location in memory.
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*
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* The workers are logically arranged in a binary tree and propagate messages
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* leaf-ward. User workers notify the root about waking and sleeping, so only
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* that one node need share a cache line with a user worker.
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*/
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#ifndef INCLUDED_SIGNAL_NODE_DOT_H
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#define INCLUDED_SIGNAL_NODE_DOT_H
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#include "rts-common.h"
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#include <cilk/common.h>
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__CILKRTS_BEGIN_EXTERN_C
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/** Opaque type. */
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typedef struct signal_node_t signal_node_t;
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/**
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* Allocate and initialize a signal_node_t
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*
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* @return The initialized signal_node_t
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*/
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COMMON_SYSDEP
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signal_node_t *signal_node_create(void);
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/**
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* Free any resources and deallocate a signal_node_t
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*
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* @param node The node to be deallocated.
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*/
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COMMON_SYSDEP void signal_node_destroy(signal_node_t *node);
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/**
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* Test whether the node thinks the worker should go to sleep
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*
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* @param node The node to be tested.
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*
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* @return 1 If the worker should go to sleep
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* @return 0 If the worker should not go to sleep
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*/
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COMMON_SYSDEP
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unsigned int signal_node_should_wait(signal_node_t *node);
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/**
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* Specify whether the worker should go to sleep
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*
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* @param node The node to be set.
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* @param msg The value to be set. Valid values are:
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* - 0 - the worker should go to sleep
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* - 1 - the worker should stay active
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*/
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COMMON_SYSDEP
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void signal_node_msg(signal_node_t *node, unsigned int msg);
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/**
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* Wait for the node to be set
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*
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* @param node The node to wait on
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*/
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COMMON_SYSDEP
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void signal_node_wait(signal_node_t *node);
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__CILKRTS_END_EXTERN_C
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#endif // ! defined(INCLUDED_SIGNAL_NODE_DOT_H)
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