6fd2a64656
ThreadBridge is used for communication between two SimObjects from different threads (EventQueue). Change-Id: I3e00df9184404599dfacef64b505cd0b64ee46aa Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/65071 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Reviewed-by: Yu-hsin Wang <yuhsingw@google.com> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>
61 lines
2.6 KiB
Python
61 lines
2.6 KiB
Python
# Copyright 2022 Google, LLC
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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: 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 the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders 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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from m5.SimObject import SimObject
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from m5.params import *
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class ThreadBridge(SimObject):
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"""Bridge for SimObjects from different threads (EventQueues)
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When two SimObjects running on two separate threads (EventQueues), an
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access from one side to the other side could easily cause event scheduled
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on the wrong event queue.
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ThreadBridge is used to migrate the EventQueue to the one used by
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ThreadBridge itself before sending transation to the other side to avoid
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the issue. The receiver side is expected to use the same EventQueue that
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the ThreadBridge is using.
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Given that this is only used for simulation speed accelerating, only the
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atomic and functional access are supported.
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Example:
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sys.initator = Initiator(eventq_index=0)
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sys.target = Target(eventq_index=1)
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sys.bridge = ThreadBridge(eventq_index=1)
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sys.initator.out_port = sys.bridge.in_port
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sys.bridge.out_port = sys.target.in_port
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"""
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type = "ThreadBridge"
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cxx_header = "mem/thread_bridge.hh"
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cxx_class = "gem5::ThreadBridge"
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in_port = ResponsePort("Incoming port")
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out_port = RequestPort("Outgoing port")
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