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The sync option adds the POSIX O_SYNC flag to the open system call on
platforms that support the flag or its equivalent, e.g.,
FILE_FLAG_WRITE_THROUGH on Windows. For platforms that don't support it,
file:open/2 returns {error, enotsup} if the sync option is passed in.
The semantics of O_SYNC are platform-specific. For example, not all
platforms guarantee that all file metadata are written to the disk along
with the file data when the flag is in effect. This issue is noted in the
documentation this commit adds for the sync option.
Add a test for the sync option. Note however that the underlying OS
semantics for O_SYNC can't be tested automatically in any practical way, so
the test assumes the OS does the right thing with the flag when
present. For manual verification, dtruss on OS X and strace on Linux were
both run against beam processes to watch calls to open(), and file:open/2
was called in Erlang shells to open files for writing, both with and
without the sync option. Both the dtruss output and the strace output
showed that the O_SYNC flag was present in the open() calls when sync was
specified and was clear when sync was not specified.
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* sverk/valgrind-added-leak-check:
erts: Prevent valgrind from repeating same memory leaks reports
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* lukas/cerl_dump/OTP-11468:
erts: Add cerl -dump and dumping in z_SUITE
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* sverk/monitor-memory-leak/OTP-11410:
erts: Fix memory leak for distributed monitors
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by using the macro VALGRIND_DO_ADDED_LEAK_CHECK if it exists
for system_info({error_checker,memory})
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On some OSs posix_memalign exists, but it does not allow for alignment
greater than the current page size. So we have to do a runtime check for
alignment size and also add cross compile options.
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* egil/fix-crashdump-pointer-crash/OTP-11420:
erts: Fix segfaulting crashdump writing
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* mhssler/fix-doc-typos/OTP-11414:
Fix ssh doc typos
Fix gen_sctp doc typo
Fix erts erlang.xml doc typo
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Crashdumps initiated by out-of-memory on spawn could cause the beam
to segfault during crashdump writing due to invalid pointers.
The pointers are invalid since the process creation never finished.
This commit remedies this problem by removing the process from
crashdump printout.
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* sverk/time-consistency-test:
erts: Fix time_SUITE:consistency to work over turn of the month
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badargif -> badarg if
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* rickard-sverker/supercarrier/OTP-11149: (29 commits)
erts: Add test case for erts_mmap
erts: Add mutex to init_atoms in erts_mmap.c
erts: Fix lock violation for init_atoms in erl_mmap.c
erts: Fix misc minor bugs in supercarrier initialization
erts: Add erts_mmap stats
erts: Add erts_bld_tupleX macros
erts: Rename erts_bld_atom_uint_2tup_list to *_uword_*
erts: Fix bug in lookup_free_seg
erts: Fix race bug in erts_munmap
erts: Add HARD_DBG_MSEG
erts: Refactor rbt_insert in erl_mmap
erts: erts_mmap improved free seg desc management
erts: Add documentation for +MMsc* system flags
erts: Allow page aligned erts_munmap()
erts: Sort tree in super aligned sizes (SA_SZ_ADDR_ORDER)
erts: Fix ASSERT bug and void* arithmetics
erts: Add mmap argument to erts_debug:get_internal_state
erts: Improve erts_mmap out of free descriptor management
erts: Cleanup erl_mmap
erts: Add __func__ to ERTS_ASSERT macro
...
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* fenollp/treewide_remove_unexpected_0xff/OTP-11323:
Remove ^L characters hidden randomly in the code. Not those used in text files as delimiters.
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Fix bsr bug occurring when shifting a huge number a huge number of
bits to the right. The bug can occur if Sint is 64 bits and int is 32
bits, causing a truncation in the big.c:I_lshift function.
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Add test data demonstrating that bsr is broken when shifting a large
number a huge number of bits to the right.
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* nox/silent-rules-fixes/OTP-11351:
Fix two small silent rules omissions
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by not holding the mseg lock while reading version and option info
which is unnecessary anyway.
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As part of erlang:system_info({allocator,mseg_alloc})
and erl_crash.dump
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for compile time argument checking
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and change from Uint to UWord values
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that could return segments that are too small after being super aligned.
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Must keep mutex to serialize (un)reserve ops.
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by putting red/black color bit in 'parent' pointer
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* Coalescing and trimming of free segments in supercarrier
* Management of super aligned and super unaligned areas in
supercarrier
* Management of reservation of physical memory
* erts_mseg usage of erts_mmap
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Introduce unconditional ERTS_ASSERT
and use that for both ASSERT and ASSERT_EXPR.
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Conflicts:
erts/vsn.mk
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* msassak/empty-pattern-badarg/OTP-11350:
stdlib: extended binary_module_SUITE to assure badarg for OTP-11350
Check all pattern arguments passed to binary:matches/2
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