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2012-09-06further use of _Noreturn, for non-plain-C functionsRich Felker-1/+8
note that POSIX does not specify these functions as _Noreturn, because POSIX is aligned with C99, not the new C11 standard. when POSIX is eventually updated to C11, it will almost surely give these functions the _Noreturn attribute. for now, the actual _Noreturn keyword is not used anyway when compiling with a c99 compiler, which is what POSIX requires; the GCC __attribute__ is used instead if it's available, however. in a few places, I've added infinite for loops at the end of _Noreturn functions to silence compiler warnings. presumably __buildin_unreachable could achieve the same thing, but it would only work on newer GCCs and would not be portable. the loops should have near-zero code size cost anyway. like the previous _Noreturn commit, this one is based on patches contributed by philomath.
2012-09-06use restrict everywhere it's required by c99 and/or posix 2008Rich Felker-27/+33
to deal with the fact that the public headers may be used with pre-c99 compilers, __restrict is used in place of restrict, and defined appropriately for any supported compiler. we also avoid the form [restrict] since older versions of gcc rejected it due to a bug in the original c99 standard, and instead use the form *restrict.
2012-02-29use c++-friendly initializers for pthread initializer definitionsRich Felker-3/+3
these will also avoid obnoxious warnings with gcc -Wbraces.
2012-02-09replace bad cancellation cleanup abi with a sane oneRich Felker-16/+9
the old abi was intended to duplicate glibc's abi at the expense of being ugly and slow, but it turns out glib was not even using that abi except on non-gcc-compatible compilers (which it doesn't even support) and was instead using an exceptions-in-c/unwind-based approach whose abi we could not duplicate anyway without nasty dwarf2/unwind integration. the new abi is copied from a very old glibc abi, which seems to still be supported/present in current glibc. it avoids all unwinding, whether by sjlj or exceptions, and merely maintains a linked list of cleanup functions to be called from the context of pthread_exit. i've made some care to ensure that longjmp out of a cleanup function should work, even though it is not required to. this change breaks abi compatibility with programs which were using pthread cancellation, which is unfortunate, but that's why i'm making the change now rather than later. considering that most pthread features have not been usable until recently anyway, i don't see it as a major issue at this point.
2011-08-14macro for pthread_equalRich Felker-0/+2
no sense bloating apps with a function call for an equality comparison...
2011-06-06use __attribute__((const)) for errno and pthread_self if __GNUC__ is definedRich Felker-0/+3
this is not too ugly and should result in significant code size and performance improvements for many programs.
2011-05-30implement pthread_[sg]etconcurrency.Rich Felker-0/+3
there is a resource limit of 0 bits to store the concurrency level requested. thus any positive level exceeds a resource limit, resulting in EAGAIN. :-)
2011-04-01fix misspelled PTHREAD_CANCELED constantRich Felker-1/+1
2011-03-25match glibc/lsb cancellation abi on i386Rich Felker-0/+2
glibc made the ridiculous choice to use pass-by-register calling convention for these functions, which is impossible to duplicate directly on non-gcc compilers. instead, we use ugly asm to wrap and convert the calling convention. presumably this works with every compiler anyone could potentially want to use.
2011-03-17implement robust mutexesRich Felker-0/+1
some of this code should be cleaned up, e.g. using macros for some of the bit flags, masks, etc. nonetheless, the code is believed to be working and correct at this point.
2011-03-12pthread.h needs clockid_tRich Felker-0/+1
actually it gets this from time.h if _POSIX_C_SOURCE or any other feature test macros are defined, but it breaks if they're not.
2011-03-11missing const in some pthread_attr_* prototypesRich Felker-8/+8
2011-03-07add prototypes for pthread_condattr_* and pthread_rwlockattr_*Rich Felker-0/+12
2011-02-18add pthread_atfork interfaceRich Felker-0/+2
note that this presently does not handle consistency of the libc's own global state during forking. as per POSIX 2008, if the parent process was threaded, the child process may only call async-signal-safe functions until one of the exec-family functions is called, so the current behavior is believed to be conformant even if non-ideal. it may be improved at some later time.
2011-02-17reorganize pthread data structures and move the definitions to alltypes.hRich Felker-45/+12
this allows sys/types.h to provide the pthread types, as required by POSIX. this design also facilitates forcing ABI-compatible sizes in the arch-specific alltypes.h, while eliminating the need for developers changing the internals of the pthread types to poke around with arch-specific headers they may not be able to test.
2011-02-16add to pthread.h: pthread_mutex_timedlock and sched.h, time.hRich Felker-1/+3
2011-02-12initial check-in, version 0.5.0v0.5.0Rich Felker-0/+216