David Xu 9b778a1611 Make sigaltstack as per-threaded, because per-process sigaltstack state
is useless for threaded programs, multiple threads can not share same
stack.
The alternative signal stack is private for thread, no lock is needed,
the orignal P_ALTSTACK is now moved into td_pflags and renamed to
TDP_ALTSTACK.
For single thread or Linux clone() based threaded program, there is no
semantic changed, because those programs only have one kernel thread
in every process.
2004-01-03 23:31:29 +00:00
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2003-06-02 16:56:40 +00:00
2003-06-02 16:56:40 +00:00
2003-06-02 16:56:40 +00:00