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2011-09-25new futex-requeue-based pthread_cond_broadcast implementationRich Felker-7/+69
this avoids the "stampede effect" where pthread_cond_broadcast would result in all waiters waking up simultaneously, only to immediately contend for the mutex and go back to sleep.
2011-09-23fix ABA race in cond vars, improve them overallRich Felker-11/+12
previously, a waiter could miss the 1->0 transition of block if another thread set block to 1 again after the signal function set block to 0. we now use the caller's thread id as a unique token to store in block, which no other thread will ever write there. this ensures that if block still contains the tid, no signal has occurred. spurious wakeups will of course occur whenever there is a spurious return from the futex wait and another thread has begun waiting on the cond var. this should be a rare occurrence except perhaps in the presence of interrupting signal handlers. signal/bcast operations have been improved by noting that they need not avoid inspecting the cond var's memory after changing the futex value. because the standard allows spurious wakeups, there is no way for an application to distinguish between a spurious wakeup just before another thread called signal/bcast, and the deliberate wakeup resulting from the signal/bcast call. thus the woken thread must assume that the signalling thread may still be waiting to act on the cond var, and therefore it cannot destroy/unmap the cond var.
2011-09-23FD_ISSET must return an int. this is the easiest way.Rich Felker-1/+1
casting to int would not be correct because high bits could be lost. mapping the high bits down onto low bits would be costlier in the common case where the result is just used in a conditional. changing the type of the bit array elements to int would permute the order of the bit array on 64-bit big endian systems, so that's not an option either.
2011-09-23sys/user.h may need stdint.hRich Felker-0/+1
2011-09-22"optimize" arm __pthread_selfRich Felker-4/+1
actually this is just to avoid gcc being stupid and refusing to inline the function version, even when the size cost is essentially identical whether it's inlined or not.
2011-09-22fix deadlock in condition wait whenever there are multiple waitersRich Felker-5/+18
it's amazing none of the conformance tests i've run even bothered to check whether something so basic works...
2011-09-22fix x86_64 user.h (previously was just a copy of i386)Rich Felker-48/+13
2011-09-22cleanup/debloat i386 user.hRich Felker-43/+11
2011-09-22wrong __WORDSIZE in x86_64 headerRich Felker-1/+1
2011-09-21protect against/handle cancellation reading shadow passwordsRich Felker-1/+11
2011-09-21make dns lookups (and thus getaddrinfo) cancellableRich Felker-4/+11
2011-09-21use poll rather than select in dns lookups (also clock_gettime)Rich Felker-12/+10
if the file descriptor resource limit has been increased past FD_SETSIZE, this is actually a security issue; we could write past the end of the fd_set object. using poll makes it a non-issue, and simplifies the code at the same time. also, use clock_gettime instead of gettimeofday, for reduced bloat and better entropy.
2011-09-21fix missing SIG_DFL, SIG_IGN, SIG_ERR without posix in signal.hRich Felker-5/+6
2011-09-21avoid setting FILE lock count when not using flockfileRich Felker-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.
2011-09-21gnu search.h has struct qelem...Rich Felker-0/+7
2011-09-21release notes for 0.8.3v0.8.3Rich Felker-0/+13
2011-09-21update syscalls with off_t arguments to handle argument alignment, if neededRich Felker-11/+14
the arm syscall abi requires 64-bit arguments to be aligned on an even register boundary. these new macros facilitate meeting the abi requirement without imposing significant ugliness on the code.
2011-09-21new gcc wrapper now supports pre-4.4 gcc versions and is more robustRich Felker-17/+40
2011-09-21new installation guide with alternate and primary libc setupsRich Felker-37/+107
2011-09-20fix some header typosRich Felker-2/+2
2011-09-20make stdbool.h conform to c99Rich Felker-1/+2
2011-09-20fix incorrect include guard in mqueue.hRich Felker-2/+2
2011-09-20fix statvfs.c to match new fsid_t definitionRich Felker-1/+1
2011-09-20fix the fsid_t structure to match name of __valRich Felker-1/+1
this is a case of poorly written man pages not matching the actual implementation, and why i hate implementing nonstandard interfaces with no actual documentation of how they're intended to work.
2011-09-20fix broken siginfo_t with _GNU_SOURCE definedRich Felker-6/+5
this bug was introduced in a recent patch. the problem we're working around is that broken GNU software wants to use "struct siginfo" rather than "siginfo_t", but "siginfo" is not in the reserved namespace and thus not legal for the standard header to use.
2011-09-19fix the definition of struct statvfs to match lsb abiRich Felker-70/+88
at the same time, make struct statfs match the traditional definition and make it more useful, especially the fsid_t stuff.
2011-09-19add some more siginfo aliases broken software expects...Rich Felker-0/+2
2011-09-19cleanup redundancy in bits/signal.h versionsRich Felker-376/+139
2011-09-19fix the type of wchar_t on arm; support wchar_t varying with archRich Felker-21/+20
really wchar_t should never vary, but the ARM EABI defines it as an unsigned 32-bit int instead of a signed one, and gcc follows this nonsense. thus, to give a conformant environment, we have to follow (otherwise L""[0] and L'\0' would be 0U rather than 0, but the application would be unaware due to a mismatched definition for WCHAR_MIN and WCHAR_MAX, and Bad Things could happen with respect to signed/unsigned comparisons, promotions, etc.). fortunately no rules are imposed by the C standard on the relationship between wchar_t and wint_t, and WEOF has type wint_t, so we can still make wint_t always-signed and use -1 for WEOF.
2011-09-19fix incorrect long double parameters on arm (and other future ports)Rich Felker-10/+22
this was the cause of crashes in printf when attempting to print floating point values.
2011-09-19fix broken multi-inclusion guard in sys/reg.hRich Felker-2/+2
2011-09-18initial commit of the arm portRich Felker-0/+2225
this port assumes eabi calling conventions, eabi linux syscall convention, and presence of the kernel helpers at 0xffff0f?0 needed for threads support. otherwise it makes very few assumptions, and the code should work even on armv4 without thumb support, as well as on systems with thumb interworking. the bits headers declare this a little endian system, but as far as i can tell the code should work equally well on big endian. some small details are probably broken; so far, testing has been limited to qemu/aboriginal linux.
2011-09-18disable dynamic linking/loading code in static libc builds, for nowRich Felker-0/+2
it does not work, but some configure scripts will falsely detect support then generate programs that crash when they call dlopen.
2011-09-18cleanup more bits cruft (sysmacros and socket)Rich Felker-414/+199
2011-09-18more bits junk (tcp.h)Rich Felker-3/+1
2011-09-18move invariant netinet/in.h stuff out of bits/in.hRich Felker-292/+147
2011-09-18overhaul clone syscall wrappingRich Felker-62/+135
several things are changed. first, i have removed the old __uniclone function signature and replaced it with the "standard" linux __clone/clone signature. this was necessary to expose clone to applications anyway, and it makes it easier to port __clone to new archs, since it's now testable independently of pthread_create. secondly, i have removed all references to the ugly ldt descriptor structure (i386 only) from the c code and pthread structure. in places where it is needed, it is now created on the stack just when it's needed, in assembly code. thus, the i386 __clone function takes the desired thread pointer as its argument, rather than an ldt descriptor pointer, just like on all other sane archs. this should not affect applications since there is really no way an application can use clone with threads/tls in a way that doesn't horribly conflict with and clobber the underlying implementation's use. applications are expected to use clone only for creating actual processes, possibly with new namespace features and whatnot.
2011-09-17release notes for 0.8.2v0.8.2Rich Felker-0/+11
2011-09-17dummy implementation of set_thread_areaRich Felker-0/+6
eventually we may have a working "generic" implementation for archs that don't need anything special. in any case, the goal of having stubs like this is to allow early testing of new ports before all the details needed for threads have been filled in. more functions like this will follow.
2011-09-16fix assumptions that char is signedRich Felker-2/+2
2011-09-16fix more instances of old a_xchg (use new a_swap name)Rich Felker-3/+3
2011-09-16use a_swap rather than old name a_xchgRich Felker-1/+1
2011-09-16fix generic sigsetjmp (unused anyway) pointer signedness errorRich Felker-1/+1
2011-09-16fix idiotic const-correctness error in lio_listioRich Felker-1/+1
i blame this one on posix for using hideous const-qualified double pointers which are unusable without hideous casts.
2011-09-16fix ptrace (maybe)Rich Felker-1/+8
2011-09-15implement ptrace syscall wrapper (untested)Rich Felker-1/+19
2011-09-140.8.1 release notesv0.8.1Rich Felker-0/+9
2011-09-14remove incorrectly-made-visible internal dst offset variableRich Felker-1/+0
2011-09-14fix inconsistent signature for aio_errorRich Felker-1/+1
2011-09-13fix return types for aio_read and aio_write againRich Felker-4/+4
previous fix was backwards and propagated the wrong type rather than the right one...