gcc/libcilkrts/runtime/signal_node.h

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