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* clean up sloppy nested inclusion from pthread_impl.hRich Felker2012-11-081-0/+1
| | | | | | | | | | | | | | this mirrors the stdio_impl.h cleanup. one header which is not strictly needed, errno.h, is left in pthread_impl.h, because since pthread functions return their error codes rather than using errno, nearly every single pthread function needs the errno constants. in a few places, rather than bringing in string.h to use memset, the memset was replaced by direct assignment. this seems to generate much better code anyway, and makes many functions which were previously non-leaf functions into leaf functions (possibly eliminating a great deal of bloat on some platforms where non-leaf functions require ugly prologue and/or epilogue).
* use restrict everywhere it's required by c99 and/or posix 2008Rich Felker2012-09-061-1/+1
| | | | | | | | 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.
* fix (hopefully) all hard-coded 8's for kernel sigset_t sizeRich Felker2012-08-091-1/+2
| | | | | | | | | | some minor changes to how hard-coded sets for thread-related purposes are handled were also needed, since the old object sizes were not necessarily sufficient. things have gotten a bit ugly in this area, and i think a cleanup is in order at some point, but for now the goal is just to get the code working on all supported archs including mips, which was badly broken by linux rejecting syscalls with the wrong sigset_t size.
* more efficient signal blocking for timer threadsRich Felker2011-08-121-4/+4
| | | | | due to the barrier, it's safe just to block signals in the new thread, rather than blocking and unblocking in the parent thread.
* normal exit from timer thread should run dtors, restore cancel stateRich Felker2011-08-111-1/+1
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* block signals in timer threadsRich Felker2011-08-111-0/+4
| | | | | | | if a timer thread leaves signals unblocked, any future attempt by the main thread to prevent the process from being terminated by blocking signals will fail, since the signal can still be delivered to the timer thread.
* optimize compound-literal sigset_t's not to contain useless hurd bitsRich Felker2011-05-071-1/+1
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* overhaul implementation-internal signal protectionsRich Felker2011-05-071-2/+1
| | | | | | | | | | | | | | | | | | | the new approach relies on the fact that the only ways to create sigset_t objects without invoking UB are to use the sig*set() functions, or from the masks returned by sigprocmask, sigaction, etc. or in the ucontext_t argument to a signal handler. thus, as long as sigfillset and sigaddset avoid adding the "protected" signals, there is no way the application will ever obtain a sigset_t including these bits, and thus no need to add the overhead of checking/clearing them when sigprocmask or sigaction is called. note that the old code actually *failed* to remove the bits from sa_mask when sigaction was called. the new implementations are also significantly smaller, simpler, and faster due to ignoring the useless "GNU HURD signals" 65-1024, which are not used and, if there's any sanity in the world, never will be used.
* use a separate signal from SIGCANCEL for SIGEV_THREAD timersRich Felker2011-04-141-7/+25
| | | | | | otherwise we cannot support an application's desire to use asynchronous cancellation within the callback function. this change also slightly debloats pthread_create.c.
* run pthread tsd destructors when a timer thread pretends to exitRich Felker2011-04-091-0/+6
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* greatly improve SIGEV_THREAD timersRich Felker2011-04-091-14/+14
| | | | | calling pthread_exit from, or pthread_cancel on, the timer callback thread will no longer destroy the timer.
* fix signal-based timers with null sigevent argumentRich Felker2011-04-061-19/+14
| | | | | | | | | | | | | since timer_create is no longer allocating a structure for the timer_t and simply using the kernel timer id, it was impossible to specify the timer_t as the argument to the signal handler. the solution is to pass the null sigevent pointer on to the kernel, rather than filling it in userspace, so that the kernel does the right thing. however, that precludes the clever timerid-versus-threadid encoding we were doing. instead, just assume timerids are below 1M and thread pointers are above 1M. (in perspective: timerids are sequentially allocated and seem limited to 32k, and thread pointers are at roughly 3G.)
* timer threads should sleep and stay asleep... a long timeRich Felker2011-04-031-1/+1
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* revert to deleting kernel-level timer from cancellation handlerRich Felker2011-04-031-0/+8
| | | | | this is necessary in order to avoid breaking timer_getoverrun in the last run of the timer event handler, if it has not yet finished.
* simplify calling of timer signal handlerRich Felker2011-04-031-3/+1
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* avoid all malloc/free in timer creation/destructionRich Felker2011-03-301-20/+4
| | | | | | | | | | instead of allocating a userspace structure for signal-based timers, simply use the kernel timer id. we use the fact that thread pointers will always be zero in the low bit (actually more) to encode integer timerid values as pointers. also, this change ensures that the timer_destroy syscall has completed before the library timer_destroy function returns, in case it matters.
* optimize timer creation and possibly protect against some minor racesRich Felker2011-03-301-14/+19
| | | | | | | | | the major idea of this patch is not to depend on having the timer pointer delivered to the signal handler, and instead use the thread pointer to get the callback function address and argument. this way, the parent thread can make the timer_create syscall while the child thread is starting, and it should never have to block waiting for the barrier.
* reorder timer initialization so that timer_create does not depend on freeRich Felker2011-03-291-8/+16
| | | | | this allows small programs which only create times, but never delete them, to use simple_malloc instead of the full malloc.
* implement POSIX timersRich Felker2011-03-291-0/+110
this implementation is superior to the glibc/nptl implementation, in that it gives true realtime behavior. there is no risk of timer expiration events being lost due to failed thread creation or failed malloc, because the thread is created as time creation time, and reused until the timer is deleted.