mirror of https://github.com/grpc/grpc.git
Direct translation of http://www.1024cores.net/home/lock-free-algorithms/queues/intrusive-mpsc-node-based-queue
Craig Tiller
9 years ago
parent
dfbb1c080a
commit
0bc11711b7
19 changed files with 182 additions and 17 deletions
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/*
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* |
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* Copyright 2016, Google Inc. |
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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 are |
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* 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 |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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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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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#include "src/core/lib/support/mpscq.h" |
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#include <grpc/support/log.h> |
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void gpr_mpscq_init(gpr_mpscq *q) { |
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gpr_atm_no_barrier_store(&q->head, (gpr_atm)&q->stub); |
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q->tail = &q->stub; |
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gpr_atm_no_barrier_store(&q->stub.next, 0); |
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} |
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void gpr_mpscq_destroy(gpr_mpscq *q) { |
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GPR_ASSERT(gpr_atm_no_barrier_load(&q->head) == (gpr_atm)&q->stub); |
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GPR_ASSERT(q->tail == &q->stub); |
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} |
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void gpr_mpscq_push(gpr_mpscq *q, gpr_mpscq_node *n) { |
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gpr_atm_no_barrier_store(&n->next, 0); |
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gpr_mpscq_node *prev = (gpr_mpscq_node*)gpr_atm_full_xchg(&q->head, (gpr_atm)n); |
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gpr_atm_rel_store(&prev->next, (gpr_atm)n); |
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} |
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gpr_mpscq_node *gpr_mpscq_pop(gpr_mpscq *q) { |
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gpr_mpscq_node *tail = q->tail; |
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gpr_mpscq_node *next = (gpr_mpscq_node*)gpr_atm_acq_load(&tail->next); |
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if (tail == &q->stub) { |
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if (next == NULL) return NULL; |
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q->tail = next; |
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tail = next; |
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next = (gpr_mpscq_node *)gpr_atm_acq_load(&tail->next); |
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} |
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if (next != NULL) { |
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q->tail = next; |
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return tail; |
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} |
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gpr_mpscq_node *head = (gpr_mpscq_node*)gpr_atm_acq_load(&q->head); |
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if (tail != head) { |
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return 0; |
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} |
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gpr_mpscq_push(q, &q->stub); |
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next = (gpr_mpscq_node *)gpr_atm_acq_load(&tail->next); |
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if (next != NULL) { |
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q->tail = next; |
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return tail; |
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} |
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return NULL; |
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} |
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@ -0,0 +1,55 @@ |
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/*
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* |
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* Copyright 2016, Google Inc. |
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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 are |
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* 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 |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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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 |
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
||||
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER 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, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#ifndef GRPC_CORE_LIB_SUPPORT_MPSCQ_H |
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#define GRPC_CORE_LIB_SUPPORT_MPSCQ_H |
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#include <stddef.h> |
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#include <grpc/support/atm.h> |
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typedef struct gpr_mpscq_node { |
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gpr_atm next; |
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} gpr_mpscq_node; |
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typedef struct gpr_mpscq { |
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gpr_atm head; |
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gpr_mpscq_node *tail; |
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gpr_mpscq_node stub; |
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} gpr_mpscq; |
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void gpr_mpscq_init(gpr_mpscq *q); |
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void gpr_mpscq_destroy(gpr_mpscq *q); |
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void gpr_mpscq_push(gpr_mpscq *q, gpr_mpscq_node *n); |
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gpr_mpscq_node *gpr_mpscq_pop(gpr_mpscq *q); |
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#endif /* GRPC_CORE_LIB_SUPPORT_MPSCQ_H */ |
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