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Age	Commit message (Collapse)	Author
2018-09-12	make internal declarations for flockfile tracking functions checkable	Rich Felker
	logically these belong to the intersection of the stdio and pthread subsystems, and either place the declarations could go (stdio_impl.h or pthread_impl.h) requires a forward declaration for one of the argument types.
2014-08-23	fix false ownership of stdio FILEs due to tid reuse	Rich Felker
	this is analogous commit fffc5cda10e0c5c910b40f7be0d4fa4e15bb3f48 which fixed the corresponding issue for mutexes. the robust list can't be used here because the locks do not share a common layout with mutexes. at some point it may make sense to simply incorporate a mutex object into the FILE structure and use it, but that would be a much more invasive change, and it doesn't mesh well with the current design that uses a simpler code path for internal locking and pulls in the recursive-mutex-like code when the flockfile API is used explicitly.
2011-07-30	add proper fuxed-based locking for stdio	Rich Felker
	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.
2011-03-12	implement flockfile api, rework stdio locking	Rich Felker