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139 lines
5.1 KiB
139 lines
5.1 KiB
/*
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* Copyright 2013 Samy Al Bahra.
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* Copyright 2013 Brendon Scheinman.
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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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#ifndef _CK_COHORT_RW_H
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#define _CK_COHORT_RW_H
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/*
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* This is an implementation of NUMA-aware reader-writer locks as described in:
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* Calciu, I.; Dice, D.; Lev, Y.; Luchangco, V.; Marathe, V.; and Shavit, N. 2013.
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* NUMA-Aware Reader-Writer Locks
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*/
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#include <ck_cc.h>
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#include <ck_pr.h>
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#include <stddef.h>
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#include <ck_cohort.h>
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#define CK_COHORT_RW_NAME(N) ck_cohort_rw_##N
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#define CK_COHORT_RW_INSTANCE(N) struct CK_COHORT_RW_NAME(N)
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#define CK_COHORT_RW_INIT(N, RW, WL) ck_cohort_rw_##N##_init(RW, WL)
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#define CK_COHORT_RW_READ_LOCK(N, RW, C, GC, LC) ck_cohort_rw_##N##_read_lock(RW, C, GC, LC)
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#define CK_COHORT_RW_READ_UNLOCK(N, RW) ck_cohort_rw_##N##_read_unlock(RW)
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#define CK_COHORT_RW_WRITE_LOCK(N, RW, C, GC, LC) ck_cohort_rw_##N##_write_lock(RW, C, GC, LC)
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#define CK_COHORT_RW_WRITE_UNLOCK(N, RW, C, GC, LC) ck_cohort_rw_##N##_write_unlock(RW, C, GC, LC)
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#define CK_COHORT_RW_DEFAULT_WAIT_LIMIT 1000
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#define CK_COHORT_RW_PROTOTYPE(N) \
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CK_COHORT_RW_INSTANCE(N) { \
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CK_COHORT_INSTANCE(N) *cohort; \
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unsigned int read_counter; \
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unsigned int write_barrier; \
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unsigned int wait_limit; \
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}; \
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\
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CK_CC_INLINE static void \
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ck_cohort_rw_##N##_init(CK_COHORT_RW_INSTANCE(N) *rw_cohort, \
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unsigned int wait_limit) \
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{ \
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rw_cohort->read_counter = 0; \
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rw_cohort->write_barrier = 0; \
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rw_cohort->wait_limit = wait_limit; \
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ck_pr_barrier(); \
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return; \
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} \
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\
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CK_CC_INLINE static void \
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ck_cohort_rw_##N##_write_lock(CK_COHORT_RW_INSTANCE(N) *rw_cohort, \
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CK_COHORT_INSTANCE(N) *cohort, void *global_context, \
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void *local_context) \
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{ \
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while (ck_pr_load_uint(&rw_cohort->write_barrier) > 0) { \
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ck_pr_stall(); \
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} \
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\
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CK_COHORT_LOCK(N, cohort, global_context, local_context); \
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\
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while (ck_pr_load_uint(&rw_cohort->read_counter) > 0) { \
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ck_pr_stall(); \
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} \
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\
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return; \
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} \
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\
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CK_CC_INLINE static void \
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ck_cohort_rw_##N##_write_unlock(CK_COHORT_RW_INSTANCE(N) *rw_cohort, \
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CK_COHORT_INSTANCE(N) *cohort, void *global_context, \
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void *local_context) \
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{ \
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(void)rw_cohort; \
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CK_COHORT_UNLOCK(N, cohort, global_context, local_context); \
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} \
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\
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CK_CC_INLINE static void \
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ck_cohort_rw_##N##_read_lock(CK_COHORT_RW_INSTANCE(N) *rw_cohort, \
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CK_COHORT_INSTANCE(N) *cohort, void *global_context, \
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void *local_context) \
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{ \
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unsigned int wait_count = 0; \
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bool raised = false; \
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start: \
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ck_pr_inc_uint(&rw_cohort->read_counter); \
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if (CK_COHORT_LOCKED(N, cohort, global_context, local_context) == true) { \
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ck_pr_dec_uint(&rw_cohort->read_counter); \
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while (CK_COHORT_LOCKED(N, cohort, global_context, local_context) == true) {\
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ck_pr_stall(); \
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if (++wait_count > rw_cohort->wait_limit && raised == false) { \
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ck_pr_inc_uint(&rw_cohort->write_barrier); \
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raised = true; \
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} \
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} \
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goto start; \
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} \
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\
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if (raised == true) { \
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ck_pr_dec_uint(&rw_cohort->write_barrier); \
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} \
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\
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return; \
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} \
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\
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CK_CC_INLINE static void \
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ck_cohort_rw_##N##_read_unlock(CK_COHORT_RW_INSTANCE(N) *cohort) \
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{ \
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ck_pr_dec_uint(&cohort->read_counter); \
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}
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#define CK_COHORT_RW_INITIALIZER { \
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.cohort = NULL, \
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.read_counter = 0, \
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.write_barrier = 0, \
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.wait_limit = 0 \
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}
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#endif /* _CK_COHORT_RW_H */
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