path: root/src/aio/aio_suspend.c
AgeCommit message (Collapse)AuthorLines
2020-10-14move aio implementation details to a proper internal headerRich Felker-0/+1
also fix the lack of declaration (and thus hidden visibility) in __stdio_close's use of __aio_close.
2019-10-28disable lfs64 aliases for remapped time64 functionsRich Felker-0/+2
these functions cannot provide the glibc lfs64-ABI-compatible symbols when time_t differs from what it was in that ABI. instead, the aliases need to be provided by the time32 compat shims or through some other mechanism.
2018-09-12remove spurious inclusion of libc.h for LFS64 ABI aliasesRich Felker-1/+1
the LFS64 macro was not self-documenting and barely saved any characters. simply use weak_alias directly so that it's clear what's being done, and doesn't depend on a header to provide a strange macro.
2018-09-12reduce spurious inclusion of libc.hRich Felker-1/+0
libc.h was intended to be a header for access to global libc state and related interfaces, but ended up included all over the place because it was the way to get the weak_alias macro. most of the inclusions removed here are places where weak_alias was needed. a few were recently introduced for hidden. some go all the way back to when libc.h defined CANCELPT_BEGIN and _END, and all (wrongly implemented) cancellation points had to include it. remaining spurious users are mostly callers of the LOCK/UNLOCK macros and files that use the LFS64 macro to define the awful *64 aliases. in a few places, new inclusion of libc.h is added because several internal headers no longer implicitly include libc.h. declarations for __lockfile and __unlockfile are moved from libc.h to stdio_impl.h so that the latter does not need libc.h. putting them in libc.h made no sense at all, since the macros in stdio_impl.h are needed to use them correctly anyway.
2018-09-12move additional pthread internal declarations to pthread_impl.h, hideRich Felker-2/+0
these were overlooked for various reasons in earlier stages.
2015-03-02make aio_suspend a cancellation point and properly handle cancellationRich Felker-3/+9
2015-03-02factor cancellation cleanup push/pop out of futex __timedwait functionRich Felker-1/+1
previously, the __timedwait function was optionally a cancellation point depending on whether it was passed a pointer to a cleaup function and context to register. as of now, only one caller actually used such a cleanup function (and it may face removal soon); most callers either passed a null pointer to disable cancellation or a dummy cleanup function. now, __timedwait is never a cancellation point, and __timedwait_cp is the cancellable version. this makes the intent of the calling code more obvious and avoids ugly dummy functions and long argument lists.
2015-02-13overhaul aio implementation for correctnessRich Felker-33/+46
previously, aio operations were not tracked by file descriptor; each operation was completely independent. this resulted in non-conforming behavior for non-seekable/append-mode writes (which are required to be ordered) and made it impossible to implement aio_cancel, which in turn made closing file descriptors with outstanding aio operations unsafe. the new implementation is significantly heavier (roughly twice the size, and seems to be slightly slower) and presently aims mainly at correctness, not performance. most of the public interfaces have been moved into a single file, aio.c, because there is little benefit to be had from splitting them. whenever any aio functions are used, aio_cancel and the internal queue lifetime management and fd-to-queue mapping code must be linked, and these functions make up the bulk of the code size. the close function's interaction with aio is implemented with weak alias magic, to avoid pulling in heavy aio cancellation code in programs that don't use aio, and the expensive cancellation path (which includes signal blocking) is optimized out when there are no active aio queues.
2014-09-05add missing legacy LFS *64 symbol aliasesSzabolcs Nagy-0/+3
versionsort64, aio*64 and lio*64 symbols were missing, they are only needed for glibc ABI compatibility, on the source level dirent.h and aio.h already redirect them.
2011-09-13fix various errors in function signatures/prototypes found by nszRich Felker-1/+1
2011-09-09implement POSIX asynchronous ioRich Felker-0/+57
some features are not yet supported, and only minimal testing has been performed. should be considered experimental at this point.