| Commit message (Collapse) | Author | Age | Files | Lines | |
|---|---|---|---|---|---|
| * | avoid setting FILE lock count when not using flockfile | Rich Felker | 2011-09-21 | 1 | -1/+1 |
| | | | | | | | | 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. | ||||
| * | add proper fuxed-based locking for stdio | Rich Felker | 2011-07-30 | 1 | -14/+12 |
| | | | | | | | | | | | | | | | | | | | | | | | 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. | ||||
| * | reduce some ridiculously large spin counts | Rich Felker | 2011-05-06 | 1 | -1/+1 |
| | | | | | | | 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... | ||||
| * | debloat: use __syscall instead of syscall where possible | Rich Felker | 2011-04-17 | 1 | -1/+1 |
| | | | | | | | 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. | ||||
| * | revert some more spin optimizations that turned out to be pessimizations | Rich Felker | 2011-03-28 | 1 | -1/+1 |
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| * | simplify and optimize FILE lock handling | Rich Felker | 2011-03-24 | 1 | -6/+7 |
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| * | global cleanup to use the new syscall interface | Rich Felker | 2011-03-20 | 1 | -1/+1 |
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| * | implement flockfile api, rework stdio locking | Rich Felker | 2011-03-12 | 1 | -0/+19 |
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