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2011-03-17reorder mutex struct fields to make room for pointers (upcoming robust mutexes)Rich Felker1-1/+3
the layout has been chosen so that pointer slots 3 and 4 fit between the integer slots on 32-bit archs, and come after the integer slots on 64-bit archs.
2011-03-17unify lock and owner fields of mutex structureRich Felker4-8/+6
this change is necessary to free up one slot in the mutex structure so that we can use doubly-linked lists in the implementation of robust mutexes.
2011-03-17optimize contended normal mutex case; add int compare-and-swap atomicRich Felker1-1/+1
2011-03-16simplify logic, slightly optimize contended case for non-default mutex typesRich Felker1-4/+2
2011-03-16correct error returns for error-checking mutexesRich Felker2-2/+6
2011-03-16cut out a syscall on thread creation in the case where guard size is 0Rich Felker1-1/+1
2011-03-16don't expose EAGAIN, etc. from timed futex wait to callerRich Felker1-1/+4
2011-03-16optimize file locking: avoid cache-polluting writes to global storageRich Felker2-3/+5
2011-03-14partially-written draft of fmemopen, still in #if 0Rich Felker1-3/+48
2011-03-12misplaced & in times() made it fail to work, and clobber the stackRich Felker1-1/+1
2011-03-12implement flockfile api, rework stdio lockingRich Felker9-15/+66
2011-03-11implement dummy pthread_attr_[gs]etschedparam functionsRich Felker2-0/+14
for some reason these functions are not shaded by the PS/TPS option in POSIX, so presumably they are mandatory, even though the functionality they offer is optional. for now, provide them in case any programs depend on their existence, but disallow any priority except the default.
2011-03-11fix pthread_attr_* implementations to match corrected prototypesRich Felker4-4/+4
2011-03-10fix failure behavior of sem_open when sem does not existRich Felker1-1/+5
2011-03-10fix some semaphore wait semantics (race condition deadlock and error checking)Rich Felker2-1/+7
2011-03-10fix sem_open and sem_close to obey posix semanticsRich Felker3-38/+85
multiple opens of the same named semaphore must return the same pointer, and only the last close can unmap it. thus the ugly global state keeping track of mappings. the maximum number of distinct named semaphores that can be opened is limited sufficiently small that the linear searches take trivial time, especially compared to the syscall overhead of these functions.
2011-03-10optimize pthread termination in the non-detached caseRich Felker2-4/+16
we can avoid blocking signals by simply using a flag to mark that the thread has exited and prevent it from getting counted in the rsyscall signal-pingpong. this restores the original pthread create/join throughput from before the sigprocmask call was added.
2011-03-10fix errors in sigqueue (potential information leak, wrong behavior)Rich Felker1-5/+7
1. any padding in the siginfo struct was not necessarily zero-filled, so it might have contained private data off the caller's stack. 2. the uid and pid must be filled in from userspace. the previous rsyscall fix broke rsyscalls because the values were always incorrect.
2011-03-10security fix: check that cancel/rsyscall signal was sent by the process itselfRich Felker1-0/+3
2011-03-10more cancellation points: tcdrain, clock_nanosleepRich Felker2-2/+12
2011-03-10remove useless return value checks for functions that cannot failRich Felker1-3/+2
2011-03-10make sigsuspend a cancellation pointRich Felker1-1/+6
2011-03-10make sigtimedwait a cancellation pointRich Felker1-0/+3
2011-03-10don't fail with EINTR in sigtimedwaitRich Felker1-6/+6
POSIX allows either behavior, but sigwait is not allowed to fail with EINTR, so the retry loop would have to be in one or the other anyway.
2011-03-10fix sigsuspend syscallRich Felker1-1/+1
2011-03-10make sigaltstack work (missing macros in signal.h, error conditions)Rich Felker1-1/+11
2011-03-10fix errno behavior in clock_* functionsRich Felker3-3/+0
these functions are specified inconsistent in whether they're specified to return an error value, or return -1 and set errno. hopefully now they all match what POSIX requires.
2011-03-09fix error handling for pthread_sigmaskRich Felker2-1/+15
it must return errno, not -1, and should reject invalud values for how.
2011-03-09make fork properly initialize the main thread in the child processRich Felker1-0/+7
2011-03-09optimize pthread initializationRich Felker1-2/+2
the set_tid_address returns the tid (which is also the pid when called from the initial thread) so there is no need to make a separate syscall to get pid/tid.
2011-03-09fix race condition in raise - just mask signalsRich Felker1-9/+9
a signal handler could fork after the pid/tid were read, causing the wrong process to be signalled. i'm not sure if this is supposed to have UB or not, but raise is async-signal-safe, so it probably is allowed. the current solution is slightly expensive so this implementation is likely to be changed in the future.
2011-03-09fix raise semantics with threads.Rich Felker1-1/+12
2011-03-08simplify and optimize pthread_mutex_trylockRich Felker1-17/+16
2011-03-08rwlock trylock functions were wrongly returning EAGAIN instead of EBUSYRich Felker2-3/+3
2011-03-08fix major breakage in pthread_once (it was always deadlocking)Rich Felker1-8/+7
the issue was a break statement that was breaking only from the switch, not the enclosing for loop, and a failure to set the final success state.
2011-03-08fix and optimize non-default-type mutex behaviorRich Felker4-25/+19
problem 1: mutex type from the attribute was being ignored by pthread_mutex_init, so recursive/errorchecking mutexes were never being used at all. problem 2: ownership of recursive mutexes was not being enforced at unlock time.
2011-03-08implement pthread_mutexattr_[gs]etpshared functionsRich Felker2-0/+16
2011-03-08disallow cpu time clocks as condattr clock valuesRich Felker1-1/+1
2011-03-07fix off-by-one error in sem_(timed)wait (using old sem value instead of new)Rich Felker1-1/+1
2011-03-07use the selected clock from the condattr for pthread_cond_timedwaitRich Felker3-1/+3
2011-03-07implement pthread_rwlockattr_* (essentially no-ops)Rich Felker4-0/+28
2011-03-07implement pthread_condattr_* interfacesRich Felker6-0/+45
note that, while the attributes are stored, they are not used in pthread_cond_init yet.
2011-03-07reject invalid attribute settingsRich Felker2-0/+2
note that this is a pedantic conformance issue and waste of code. it only affects broken code or code that is probing for conformance.
2011-03-07implement barrier attribute functions (essentially no-ops)Rich Felker4-0/+27
2011-03-04enforce stack size min in pthread_attr_setstacksizeRich Felker1-1/+1
2011-03-04implement POSIX semaphoresRich Felker10-0/+201
2011-03-03optimize POSIX TSD for fast pthread_getspecificRich Felker4-9/+14
2011-03-03implement POSIX shared memoryRich Felker2-0/+42
2011-03-01depends on settimeofday which needs _GNU_SOURCE feature testRich Felker1-0/+1
2011-02-27implement futimens and utimensatRich Felker2-0/+13
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