| Commit message (Expand) | Author | Age | Files | Lines |
|---|
| * | document self-synchronized destruction issue for stdio locking | Rich Felker | 2012-12-10 | 1 | -0/+10 |
| * | avoid setting FILE lock count when not using flockfile•••for now this is just a tiny optimization, but later if we support
cancellation from __stdio_read and __stdio_write, it will be necessary
for the recusrive lock count to be zero in order for these functions
to know they are responsible for unlocking the FILE on cancellation.
| Rich Felker | 2011-09-21 | 1 | -1/+1 |
| * | add proper fuxed-based locking for stdio•••previously, stdio used spinlocks, which would be unacceptable if we
ever add support for thread priorities, and which yielded
pathologically bad performance if an application attempted to use
flockfile on a key file as a major/primary locking mechanism.
i had held off on making this change for fear that it would hurt
performance in the non-threaded case, but actually support for
recursive locking had already inflicted that cost. by having the
internal locking functions store a flag indicating whether they need
to perform unlocking, rather than using the actual recursive lock
counter, i was able to combine the conditionals at unlock time,
eliminating any additional cost, and also avoid a nasty corner case
where a huge number of calls to ftrylockfile could cause deadlock
later at the point of internal locking.
this commit also fixes some issues with usage of pthread_self
conflicting with __attribute__((const)) which resulted in crashes with
some compiler versions/optimizations, mainly in flockfile prior to
pthread_create.
| Rich Felker | 2011-07-30 | 1 | -14/+12 |
| * | reduce some ridiculously large spin counts•••these should be tweaked according to testing. offhand i know 1000 is
too low and 5000 is likely to be sufficiently high. consider trying to
add futexes to file locking, too...
| Rich Felker | 2011-05-06 | 1 | -1/+1 |
| * | debloat: use __syscall instead of syscall where possible•••don't waste time (and significant code size due to function call
overhead!) setting errno when the result of a syscall does not matter
or when it can't fail.
| Rich Felker | 2011-04-17 | 1 | -1/+1 |
| * | revert some more spin optimizations that turned out to be pessimizations | Rich Felker | 2011-03-28 | 1 | -1/+1 |
| * | simplify and optimize FILE lock handling | Rich Felker | 2011-03-24 | 1 | -6/+7 |
| * | global cleanup to use the new syscall interface | Rich Felker | 2011-03-20 | 1 | -1/+1 |
| * | implement flockfile api, rework stdio locking | Rich Felker | 2011-03-12 | 1 | -0/+19 |
