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The recv_mark/1 instruction will both save the current
position in the message queue and a mark (the address of the
loop_rec/2 instruction just following the recv_set/1
instruction). The recv_mark/1 instruction will only
use the saved position if the mark is correct.
The reason for saving and verifying the mark is that
the compiler does not need to guarantee that no other
receive instruction can be executed in between the
recv_mark/1 and recv_set/1 instructions (the mark will
be cleared by the remove_message/0 instruction when a message
is removed from the message queue). That means that arbitrary
function calls in between those instruction can be allowed.
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We don't attempt to run the generated code, but use beam_disasm
and check for the presence or absence (as appropriate) of the
recv_mark/1 and recv_set/1 instructions.
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If a gen_server process has many messages in its message queue and
calls another gen_server process, the selective receive in
gen_server:call() will have to go through the entire message queue.
Have the compiler generate the new mark_recv/1 and mark_recv/1
instructions that can avoid going through the entire message queue.
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Make the recv_mark/1 and recv_mark/1 instructions known to the
compiler and run-time system. For the moment, make the loader ignore
any occurrences of those instructions in BEAM files.
Also update hipe_beam_to_icode to ignore those instructions.
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R12 nodes cannot load code that use the optimized receive that
we are about to implement.
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It can be useful for other test suites.
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We are about to introduce a new optimization that requires
the creation of a monitor and the following receive statement
to be in the same function.
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* ks/syntax_tools:
Fix an erroneous spec
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* ms/epmd-error-checking:
Exit if an error occurs with the listening socket
OTP-8618 ms/epmd-error-checking
The empd program could loop and consume 100% CPU time if an unexpected
error ocurred in listen() or accept(). Now epmd will terminate if a
non-recoverable error occurs. (Thanks to Michael Santos.)
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While at it, take out redundant code.
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* sv/sasl-fix-get_status:
Prepare patch release
fix sys:get_status backward compatibility for sasl release_handler_1
OTP-8619 sv/sasl-fix-get_status
In R13B04 sys:get_status was modified to invoke format_status/2 in the
callback module if the module exports that function. This resulted in a
change to the term returned from calling sys:get_status on the supervisor
module, since supervisor is a gen_server and gen_server exports
format_status. The sasl release_handler_1 module had a dependency on the
pre-R13B04 term returned by sys:get_status when invoked on a supervisor, so
the R13B04 change broke that dependency.
This problem has been fixed by change release_handler_1 to handle both the
pre-R13B04 and R13B04 terms that sys:get_status can return from a
supervisor.
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* bg/file-del_dir:
Adjust test of file:del_dir("..") to accept {error,einval}
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OTP-8574: Option to allow invalid row OIDs
OTP-8594: Make snmp forward compatible with new crypto
OTP-8595: snmpc fails to compile BITS with "holes"
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On FreeBSD, file:del_dir("..") will return {error,einval} rather
than the expected {error,eexist}, and so will file:del_dir("../.."),
and so on.
It could be argued that we should change the implementation of
file:del_dir/1 to remap the error code (as some other error codes
are remapped to reduce the differences between different platforms),
but the consistency gained does not seem to be worth the effort.
Therefore, until we'll find a real-world use case where it is
essential to have consistent error codes for file:del_dir("..") on
all platforms, change the test case to accept both errors.
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In R13B04 sys:get_status was modified to invoke format_status/2 in the
callback module if the module exports that function. This resulted in
a change to the term returned from calling sys:get_status on the
supervisor module, since supervisor is a gen_server and gen_server
exports format_status. The sasl release_handler_1 module had a
dependency on the pre-R13B04 term returned by sys:get_status when
invoked on a supervisor, so the R13B04 change broke that dependency.
Change release_handler_1 to handle both the pre-R13B04 and R13B04
terms that sys:get_status can return from a supervisor.
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* rd/erlang-eunit:
erlang-eunit.el: Require cl, as it is used
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* ms/inet_gethost-safe-debug-output:
Truncate debug messages
OTP-8615 ms/inet_gethost-safe-debug-output
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* sv/env-with-equal-sign:
allow open_port to set env vars containing a trailing '=' character
OTP-8614 sv/env-with-equal-sign
The erlang:open_port spawn and spawn_executable directives can include an
{env,Env} directive to set up environment variables for the spawned
process. A bug prevented applications from using {env,Env} to set an
environment variable whose value ended with a '=' (equal sign) character;
the trailing equal sign was mistaken as an indication that an environment
variable was to be cleared from the environment of the spawned process.
(Thanks to Steve Vinoski.)
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When the undocumented ERL_INET_GETHOST_DEBUG environment variable
is set to 5, very long hostnames can overflow the buffer used to
construct the debug message. Truncate debug messages if they exceed
the size of the buffer.
export ERL_INET_GETHOST_DEBUG=5
inet:gethostbyname(lists:duplicate(5000,"x")).
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The erlang:open_port spawn and spawn_executable directives can include
an {env, Env} directive to set up environment variables for the
spawned process. A bug in ert/emulator/sys/unix/sys.c prevented
applications from using {env, Env} to set an environment variable
whose value ended with a '=' (equal sign) character; the code mistook
the trailing equal sign as an indication that an environment variable
was to be cleared from the environment of the spawned process.
For example, passing an {env, Env} of
{env, [{"foo", "bar="}]}
would result in the code in sys.c seeing a string of the form
"foo=bar="
The code would see the final '=' character and assume the directive
wanted to clear a variable named "foo=bar" from the environment of the
spawned process, rather than seeing it as a directive to set the
environment variable "foo" to the value "bar=".
Fix this problem and add a new regression test for it to the port test
suite.
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Check errno if either select() or accept() returns an error and exit.
This prevents epmd from looping and taking up 100% CPU.
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* bg/remove-stray-ose-support:
configure: Remove stray OSE/Delta support
Makefiles: Remove stray OSE/Delta support
kernel tests: Remove stray OSE/Delta support
system tests: Remove stray OSE/Delta support
erl_interface tests: Remove stray OSE/Delta support
epmd: Remove stray OSE/Delta support
epmd: #ifdef out start_epmd() for other platforms than VxWorks
emulator tests: Remove stray OSE/Delta support
emulator: Remove stray OSE/Delta support
emulator: Eliminate #ifdef for sys_tty_reset()
test_server: Remove stray support for OSE/Delta
OTP-8585 bg/remove-stray-ose-support
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There is no reason to define a function that is never used.
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In the erts/emulator/beam sources
#ifdef SOME_OPERATING_SYSTEM
should be avoided. Instead, call a function implemented in
sys/OPERATING_SYSTEM/sys.c.
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Remove code supporting testing on OSE/Delta.
Some cross-testing support only used by OSE/Delta is kept
(see the mention of OSE in test_server_internal.hrl), because
it could presumably be useful in the future if we are to test
some other embedded system.
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* ks/kernel:
kernel: Clean up as suggested by tidier
OTP-8606 ks/kernel
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Alert handling has been improved to better handle unexpected but valid
messages and the implementation is also changed to avoid timing related
issues that could cause different error messages depending on network
latency. Packet handling was sort of broken but would mostly work as
expected when socket was in binary mode. This has now been fixed.
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OTP-8607: https default port not handled
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crypto application changed to use NIFs instead of driver.
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Fix memory management bug causing crash of non-SMP emulator with async
threads enabled. The bug did first appear in R13B03.
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New NIF API function enif_make_new_binary
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