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1b39bcd883
If the socketpair used by signaler_t fills up, this can lead to deadlock. This patch provides partial resolution by attempting to resize SO_SNDBUF on the writer side, and if that fails we shall at least assert rather than hang. I've also refactored the signaler_t code to make the platform-dependent parts clearer and have tested both the MSG_DONTWAIT and standard POSIX path in recv. The Win32 implementation currently does not implement resizing as I'm not convinced that it's safe, but it will also assert like other platforms if signaler_t::send() cannot succeed. The OpenVMS implementation has been carried forward but is untested. Signed-off-by: Martin Lucina <mato@kotelna.sk>
91 lines
3.5 KiB
C++
91 lines
3.5 KiB
C++
/*
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Copyright (c) 2007-2010 iMatix Corporation
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This file is part of 0MQ.
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0MQ is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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0MQ is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ZMQ_CONFIG_HPP_INCLUDED__
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#define __ZMQ_CONFIG_HPP_INCLUDED__
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namespace zmq
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{
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// Compile-time settings.
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enum
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{
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// Maximum number of sockets that can be opened at the same time.
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max_sockets = 512,
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// Number of new messages in message pipe needed to trigger new memory
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// allocation. Setting this parameter to 256 decreases the impact of
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// memory allocation by approximately 99.6%
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message_pipe_granularity = 256,
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// Determines how often does socket poll for new commands when it
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// still has unprocessed messages to handle. Thus, if it is set to 100,
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// socket will process 100 inbound messages before doing the poll.
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// If there are no unprocessed messages available, poll is done
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// immediately. Decreasing the value trades overall latency for more
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// real-time behaviour (less latency peaks).
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inbound_poll_rate = 100,
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// Maximal batching size for engines with receiving functionality.
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// So, if there are 10 messages that fit into the batch size, all of
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// them may be read by a single 'recv' system call, thus avoiding
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// unnecessary network stack traversals.
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in_batch_size = 8192,
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// Maximal batching size for engines with sending functionality.
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// So, if there are 10 messages that fit into the batch size, all of
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// them may be written by a single 'send' system call, thus avoiding
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// unnecessary network stack traversals.
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out_batch_size = 8192,
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// Maximal delta between high and low watermark.
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max_wm_delta = 1024,
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// Swap inteligently batches data for writing to disk. The size of
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// the batch in bytes is specified by this option.
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swap_block_size = 8192,
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// Maximum number of events the I/O thread can process in one go.
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max_io_events = 256,
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// Should initial connection attempts be delayed?
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wait_before_connect = false,
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// Maximal delay to process command in API thread (in CPU ticks).
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// 3,000,000 ticks equals to 1 - 2 milliseconds on current CPUs.
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// Note that delay is only applied when there is continuous stream of
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// messages to process. If not so, commands are processed immediately.
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max_command_delay = 3000000,
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// Low-precision clock precision in CPU ticks. 1ms. Value of 1000000
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// should be OK for CPU frequencies above 1GHz. If should work
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// reasonably well for CPU frequencies above 500MHz. For lower CPU
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// frequencies you may consider lowering this value to get best
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// possible latencies.
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clock_precision = 1000000,
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// Maximum transport data unit size for PGM (TPDU).
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pgm_max_tpdu = 1500
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};
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}
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#endif
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