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2011-04-06move rsyscall out of pthread_create moduleRich Felker10-109/+133
this is something of a tradeoff, as now set*id() functions, rather than pthread_create, are what pull in the code overhead for dealing with linux's refusal to implement proper POSIX thread-vs-process semantics. my motivations are: 1. it's cleaner this way, especially cleaner to optimize out the rsyscall locking overhead from pthread_create when it's not needed. 2. it's expected that only a tiny number of core system programs will ever use set*id() functions, whereas many programs may want to use threads, and making thread overhead tiny is an incentive for "light" programs to try threads.
2011-04-06pthread exit stuff: don't bother setting errno when we won't check it.Rich Felker1-2/+2
2011-04-06fix rsyscall handler: must not clobber errno from signal contextRich Felker1-2/+4
2011-04-06fix typo in sys/msg.hRich Felker1-1/+1
2011-04-06add startup abi functions, dummy for now. eventually needed for c++ support.Rich Felker2-0/+10