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Multiple I/O of the same type is not supported

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fix #1682
This commit is contained in:
Vinnie Falco
2019-08-29 10:55:47 -07:00
parent e681f9d212
commit c5d8c7b64c
2 changed files with 8 additions and 0 deletions
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1
CHANGELOG.md
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@ -5,6 +5,7 @@ Version 267:
* basic_stream dtor cannot throw * basic_stream dtor cannot throw
* cmake: check policy first * cmake: check policy first
* Add default dtors to satisfy -Wnon-virtual-dtor * Add default dtors to satisfy -Wnon-virtual-dtor
* Multiple I/O of the same type is not supported
-------------------------------------------------------------------------------- --------------------------------------------------------------------------------

7
include/boost/beast/core/detail/stream_base.hpp
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@ -70,6 +70,13 @@ struct stream_base
pending_guard(bool& b) pending_guard(bool& b)
: b_(b) : b_(b)
{ {
// If this assert goes off, it means you are attempting
// to issue two of the same asynchronous I/O operation
// at the same time, without waiting for the first one
// to complete. For example, attempting two simultaneous
// calls to async_read_some. Only one pending call of
// each I/O type (read and write) is permitted.
//
BOOST_ASSERT(! b_); BOOST_ASSERT(! b_);
b_ = true; b_ = true;
} }