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2011-03-17implement robust mutexesRich Felker-0/+5
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.
2011-03-17reorder mutex struct fields to make room for pointers (upcoming robust mutexes)Rich Felker-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 Felker-1/+0
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.
2011-03-12implement flockfile api, rework stdio lockingRich Felker-12/+11
2011-03-10optimize pthread termination in the non-detached caseRich Felker-0/+1
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.
2011-03-08fix and optimize non-default-type mutex behaviorRich Felker-0/+1
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.
2011-03-07use the selected clock from the condattr for pthread_cond_timedwaitRich Felker-0/+1
2011-02-24various changes in preparation for dynamic linking supportRich Felker-5/+13
prefer using visibility=hidden for __libc internal data, rather than an accessor function, if the compiler has visibility. optimize with -O3 for PIC targets (shared library). without heavy inlining, reloading the GOT register in small functions kills performance. 20-30% size increase for a single libc.so is not a big deal, compared to comparaible size increase in every static binaries. use -Bsymbolic-functions, not -Bsymbolic. global variables are subject to COPY relocations, and thus binding their addresses in the library at link time will cause library functions to read the wrong (original) copies instead of the copies made in the main program's bss section. add entry point, _start, for dynamic linker.
2011-02-20use an accessor function for __libc data pointer when compiled as PICRich Felker-4/+19
prior to this change, a large portion of libc was unusable prior to relocation by the dynamic linker, due to dependence on the global data in the __libc structure and the need to obtain its address through the GOT. with this patch, the accessor function __libc_loc is now able to obtain the address of __libc via PC-relative addressing without using the GOT. this means the majority of libc functionality is now accessible right away. naturally, the above statements all depend on having an architecture where PC-relative addressing and jumps/calls are feasible, and a compiler that generates the appropriate code.
2011-02-18add pthread_atfork interfaceRich Felker-0/+1
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-0/+19
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.
2011-02-15move arch-specific internal headers into placeRich Felker-637/+0
2011-02-15finish unifying thread register handling in preparation for portingRich Felker-8/+2
2011-02-15begin unifying clone/thread management interface in preparation for portingRich Felker-5/+3
2011-02-13cleaning up syscalls in preparation for x86_64 portRich Felker-9/+40
- hide all the legacy xxxxxx32 name cruft in syscall.h so the actual source files can be clean and uniform across all archs. - cleanup llseek/lseek and mmap2/mmap handling for 32/64 bit systems - alternate implementation for nice if the target lacks nice syscall
2011-02-12ensure that the compiler doesn't try to reorder around atomic opsRich Felker-13/+13
2011-02-12initial check-in, version 0.5.0v0.5.0Rich Felker-0/+852