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* implement robust mutexesRich Felker2011-03-178-10/+78
| | | | | | 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.
* avoid function call to pthread_self in mutex unlockRich Felker2011-03-171-1/+1
| | | | | | if the mutex was previously locked, we can assume pthread_self was already called at the time of locking, and thus that the thread pointer is initialized.
* unify lock and owner fields of mutex structureRich Felker2011-03-173-7/+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.
* optimize contended normal mutex case; add int compare-and-swap atomicRich Felker2011-03-171-1/+1
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* simplify logic, slightly optimize contended case for non-default mutex typesRich Felker2011-03-161-4/+2
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* correct error returns for error-checking mutexesRich Felker2011-03-162-2/+6
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* cut out a syscall on thread creation in the case where guard size is 0Rich Felker2011-03-161-1/+1
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* don't expose EAGAIN, etc. from timed futex wait to callerRich Felker2011-03-161-1/+4
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* implement flockfile api, rework stdio lockingRich Felker2011-03-121-0/+1
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* implement dummy pthread_attr_[gs]etschedparam functionsRich Felker2011-03-112-0/+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.
* fix pthread_attr_* implementations to match corrected prototypesRich Felker2011-03-114-4/+4
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* fix failure behavior of sem_open when sem does not existRich Felker2011-03-101-1/+5
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* fix some semaphore wait semantics (race condition deadlock and error checking)Rich Felker2011-03-102-1/+7
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* fix sem_open and sem_close to obey posix semanticsRich Felker2011-03-102-33/+80
| | | | | | | | | 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.
* optimize pthread termination in the non-detached caseRich Felker2011-03-101-4/+15
| | | | | | | 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.
* security fix: check that cancel/rsyscall signal was sent by the process itselfRich Felker2011-03-101-0/+3
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* fix error handling for pthread_sigmaskRich Felker2011-03-091-0/+10
| | | | it must return errno, not -1, and should reject invalud values for how.
* optimize pthread initializationRich Felker2011-03-091-2/+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.
* simplify and optimize pthread_mutex_trylockRich Felker2011-03-081-17/+16
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* rwlock trylock functions were wrongly returning EAGAIN instead of EBUSYRich Felker2011-03-082-3/+3
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* fix major breakage in pthread_once (it was always deadlocking)Rich Felker2011-03-081-8/+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.
* fix and optimize non-default-type mutex behaviorRich Felker2011-03-083-25/+18
| | | | | | | | | 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.
* implement pthread_mutexattr_[gs]etpshared functionsRich Felker2011-03-082-0/+16
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* disallow cpu time clocks as condattr clock valuesRich Felker2011-03-081-1/+1
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* fix off-by-one error in sem_(timed)wait (using old sem value instead of new)Rich Felker2011-03-071-1/+1
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* use the selected clock from the condattr for pthread_cond_timedwaitRich Felker2011-03-072-1/+2
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* implement pthread_rwlockattr_* (essentially no-ops)Rich Felker2011-03-074-0/+28
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* implement pthread_condattr_* interfacesRich Felker2011-03-076-0/+45
| | | | | note that, while the attributes are stored, they are not used in pthread_cond_init yet.
* reject invalid attribute settingsRich Felker2011-03-072-0/+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.
* implement barrier attribute functions (essentially no-ops)Rich Felker2011-03-074-0/+27
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* enforce stack size min in pthread_attr_setstacksizeRich Felker2011-03-041-1/+1
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* implement POSIX semaphoresRich Felker2011-03-0410-0/+201
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* optimize POSIX TSD for fast pthread_getspecificRich Felker2011-03-034-9/+14
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* use rt_sigprocmask, not legacy sigprocmask, syscall in pthread exit codeRich Felker2011-02-191-1/+1
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* race condition fix: block all signals before decrementing thread countRich Felker2011-02-193-22/+2
| | | | | | | | | | | | the existence of a (kernelspace) thread must never have observable effects after the thread count is decremented. if signals are not blocked, it could end up handling the signal for rsyscall and contributing towards the count of threads which have changed ids, causing a thread to be missed. this could lead to one thread retaining unwanted privilege level. this change may also address other subtle race conditions in application code that uses signals.
* make pthread_exit run dtors for last thread, wait to decrement thread countRich Felker2011-02-191-3/+3
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* add pthread_atfork interfaceRich Felker2011-02-181-0/+48
| | | | | | | | | 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.
* reorganize pthread data structures and move the definitions to alltypes.hRich Felker2011-02-1723-83/+83
| | | | | | | | 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.
* patch by njk, simplifies thread register initialization for x86_64Rich Felker2011-02-161-4/+0
| | | | | It's not necessary to save any registers on the stack across syscall in x86_64 __set_thread_area. Don't waste cycles or bytes on it.
* patch from njk: make x86_64 __uniclone branchless.Rich Felker2011-02-161-6/+6
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* Port musl to x86-64. One giant commit!Nicholas J. Kain2011-02-153-0/+61
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* finish unifying thread register handling in preparation for portingRich Felker2011-02-154-44/+25
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* begin unifying clone/thread management interface in preparation for portingRich Felker2011-02-152-29/+19
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* make pthread_create return EAGAIN on resource failure, as required by POSIXRich Felker2011-02-151-1/+1
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* reorganize thread exit code, make pthread_exit call cancellation handlers (pt2)Rich Felker2011-02-132-22/+51
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* reorganize thread exit code, make pthread_exit call cancellation handlersRich Felker2011-02-131-25/+0
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* initial check-in, version 0.5.0 v0.5.0Rich Felker2011-02-1270-0/+1030
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