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61 lines
2.1 KiB
61 lines
2.1 KiB
/*
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* Copyright 2011-2014 Samy Al Bahra.
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* Copyright 2011 David Joseph.
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* All rights reserved.
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*
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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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <ck_barrier.h>
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#include <ck_pr.h>
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void
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ck_barrier_centralized(struct ck_barrier_centralized *barrier,
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struct ck_barrier_centralized_state *state,
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unsigned int n_threads)
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{
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unsigned int sense, value;
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/*
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* Every execution context has a sense associated with it.
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* This sense is reversed when the barrier is entered. Every
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* thread will spin on the global sense until the last thread
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* reverses it.
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*/
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sense = state->sense = ~state->sense;
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value = ck_pr_faa_uint(&barrier->value, 1);
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if (value == n_threads - 1) {
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ck_pr_store_uint(&barrier->value, 0);
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ck_pr_fence_memory();
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ck_pr_store_uint(&barrier->sense, sense);
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return;
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}
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ck_pr_fence_load();
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while (sense != ck_pr_load_uint(&barrier->sense))
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ck_pr_stall();
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ck_pr_fence_memory();
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return;
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}
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