Jason Evans 0a3fa43c7e Implement continuations to correctly handle [sig|_]longjmp() inside of a ... signal handler. Explicitly check for jumps to anywhere other than the current stack, since such jumps are undefined according to POSIX. While we're at it, convert thread cancellation to use continuations, since it's cleaner than the original cancellation code. Avoid delivering a signal to a thread twice. This was a pre-existing bug, but was likely unexposed until these other changes were made. Defer signals generated by pthread_kill() so that they can be delivered on the appropriate stack. deischen claims that this is unnecessary, which is likely true, but without this change, pthread_kill() can cause undefined priority queue states and/or PANICs in [sig|_]longjmp(), so I'm leaving this in for now. To compile this code out and exercise the bug, define the _NO_UNDISPATCH cpp macro. Defining _PTHREADS_INVARIANTS as well will cause earlier crashes. PR: kern/14685 Collaboration with: deischen		2000-01-19 07:04:50 +00:00
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arch	$Id$ -> $FreeBSD$	1999-08-28 00:22:10 +00:00
man	Fixed bitrot in synopsis. The change from "int *pshared" to "int pshared"	1999-12-23 16:51:27 +00:00
sys	$Id$ -> $FreeBSD$	1999-08-28 00:22:10 +00:00
test	Change to work with recent signal changes. The signal being handled is	1999-12-17 11:46:55 +00:00
uthread	Implement continuations to correctly handle [sig|_]longjmp() inside of a	2000-01-19 07:04:50 +00:00
Makefile	Fix some minor POSIX/SUSv2 compliance nits.	1999-12-18 01:00:42 +00:00