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Instead of forking from the beam process, we create a separate
process in which all forks are done. This has several advantages:
1) performance:
* don't have to close all fd's in the world
* fork only has to copy stuff from a small process
* work is done in a completely seperate process
* a 3x performance increase has been measured,
can be made even greater (10x) if we cache the
environment in child setup
2) stability
* the exec is done in another process than beam, which means that
if the file that we exec to is on an nfs that is not available
right now we will not block a scheduler until the nfs returns.
3) simplicity
* don't have to deal with SIGCHLD in the erts
Unfortunately, this solution also implies some badness.
1) There will always be a seperate process running together with
beam on unix. This could be confusing and undesirable.
2) We have to transfer the entire environment to child_setup
for each command.
OTP-13088
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OTP-13147
* sverk/cpool_fetch-dc_list-fix:
erts: Reduce alloc_SUITE:rbtree runtime for valgrind
erts: Remove double free in efile_drv
erts: Improve alloc_SUITE:migration test
erts: Pass free mem and build type to alloc_SUITE tests
erts: Fix snprintf in alloc_SUITE for windows
erts: Workaround for strange crash on win64 in alloc_SUITE test code
erts: Refactor alloc_SUITE to use NIFs instead of drivers
erts: Add enif_getenv
erts: Make key argument constant for erl_drv_{get|put}env
erts: Add alloc_SUITE:migration
erts: Add TEST allocator
erts: Fix confusion of callbacks destroying_mbc() vs remove_mbc()
erts: Fix resurrection of carriers from dc_list
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This should be a harmless and compatible API change.
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The presence of this symbol is libc-specific. In particular, it is
absent from musl. The correct solution is to use uint32_t.
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And remove old case of using only page alignment (12 bits).
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Conflicts:
OTP_VERSION
erts/vsn.mk
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Several users on erlang-questions have reported problems with recent
releases where output to standard_error causes standard_error_sup to
die from receiving an unexpected eagain error. In the fd_driver,
change the fd_async() function to handle EINTR, and change
fd_ready_async() to handle ERRNO_BLOCK. Add a new test to
standard_error_SUITE to generate output to standard_error and ensure
that standard_error_sup does not die. Thanks to Kota Uenishi for
contributing the test case.
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The OSE port is no longer supported and this commit removed it
and any changes related to it. The things that were general
improvements have been left in the code.
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* egil/remove-halfword/OTP-12883: (21 commits)
erts: Remove halfword etp-commands
erts: Remove halfword MemKind mseg
erts: Remove halfword bases in ETS
erts: Remove halfword CHECK_POINTER_MASK
erts: Remove halfword relative printf
erts: Remove halfword valgrind suppress file
erts: Remove halfword specific tests
erts: Remove halfword specific allocator types
erts: Remove halfword BINARY RELs
erts: Remove halfword is_same bases macro
erts: Reinstate copy_object over-allocation optimization
erts: Remove halfword copy_object_rel
erts: Remove halfword object manipulation
erts: Remove halfword heap relative comparisions
erts: Remove halfword pointer compression
erts: Remove halfword basic relative heap operations
erts: Remove halfword from configure
erts: Remove halfword in lib_src
erts: Remove halfword in erl_nif.h
erts: Remove halfword in erl_driver.h
...
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* sverk/poll-lost-wakeup/OTP-12859:
erts: Fix race in poller thread wake up
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Conflicts:
OTP_VERSION
erts/doc/src/notes.xml
erts/vsn.mk
otp_versions.table
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* sverk/poll-lost-wakeup/OTP-12859:
erts: Fix race in poller thread wake up
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OTP-12845
* bruce/change-license:
fix errors caused by changed line numbers
Change license text to APLv2
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* sverk/poll-grow:
erts: Refactor growth of fd tables
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to have one common implementation for both _kp and _nkp.
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* mikpe/erl_child_setup-android-breakage:
erl_child_setup.c: fix Android breakage
OTP-12751
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* egil/erts/high_accuracy_sleep/OTP-12236:
erts: Add high accuracy poll timeouts
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* sverk/erts-fp-exception-fixes/OTP-12717:
erts: Disable float exceptions for clang/llvm
erts: Increase buffer in erts_fp_check_init_error
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* rickard/timer-optimization/OTP-12650:
Optimized timer implementation
Reusable red-black tree implementation
Conflicts:
erts/emulator/beam/erl_bif_timer.c
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* rickard/time-improvement/OTP-11997:
Allow execution of estone suite on pre OTP-18 systems
Add parallel time monotonicity test-case
Replace usage of erlang:now() in line-tracing
Replace erlang:now() usage in emulator suite
Replace erlang:now() usage in system suite
Misc time improvements
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- Possibility to chose different clock sources
- Improved mach clock usage
- Improved linux clock_gettime() usage
- ...
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The current size is too small for 64-bit machines,
causing messages to be truncated and making debugging
more difficult.
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The Android support in erl_child_setup.c is broken:
1. The close fd loop compares an fd (integer i) with the address of the function
__system_properties_fd rather than the value of calling that function.
2. This function is locally defined, but its name starts with two underscores
which is reserved for the implementation.
3. This function is not used outside of this file, so should be static.
4. This function performs a fair amount of work (calls getenv and atoi), which
would be repeated for each and every fd in the [from,to] range.
5. This function contains an unsed local variable 's'.
Fixed by dropping the __ prefix, making the function static, dropping the unused
local variable, and rewriting the close fd loop to call the function at most once.
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* sverk/pr632/prevent-illegal-nif-terms/OTP-12655:
erts: Reject non-finite float terms in erl_drv_output_term
erts: Remove old docs about experimental NIF versions.
erts: Add enif_has_pending_exception
erts: Clearify erl_nif documentation about badarg exception
erts: Fix compile warning in enif_make_double
erts: Fix divide by zero compile error in nif_SUITE.c
erts: Fix isfinite for windows
Ensure NIF term creation disallows illegal values
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Add macro erts_isfinite as an OS independent way to check
if a float is finite.
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Different poll/select implementations have different ways
to handle timeouts of < ms accuracy. Most have extended
API like pselect or such, while others rely on using
timerfds (epoll_wait). If no high accuracy timeout is
available, we simply round up to nearest ms. If we do not
roundup we will spin the last ms when waiting for a timeout
which is not desirable.
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* rickard/time_api/OTP-11997:
Misc fixes
Conflicts:
erts/preloaded/ebin/erlang.beam
erts/preloaded/ebin/erts_internal.beam
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* rickard/time_api/OTP-11997:
Fix erts_sys_hrtime() fallback
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* rickard/time_api/OTP-11997:
Skip not updated test-cases
Fixes and cleanup
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* rickard/time_api/OTP-11997:
Better OS system time implementation
Documentation adjustments
Fix zero timout timers
erts_sys_hrtime() for lcnt
Better support for poor os monotonic sources
Conflicts:
erts/preloaded/ebin/erlang.beam
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