[PATCH] thread cancellation via C++ exception

[Alexander Terekhov]

http://www.redhat.com/archives/phil-list/2004-May/msg00016.html

<quote>

Cancellation, as the word already suggests, is final.  There mustn't 
be any catch without rethrow.  The thread library does, and will 
probably even more so in future, alter the state of the library once 
a thread is canceled and this is not reversible.

</quote>

This is utter crap. The only "state" affected by thread cancel 
request delivery is the cancellation state and mode. They must be 
set to PTHREAD_CANCEL_DISABLE and PTHREAD_CANCEL_DEFERRED 
respectively. There's no rational reason whatsoever for thread 
cancel (and even exit) exceptions [std::thread_cancel_request and 
std::thread_exit_request; both "is a" 
std::thread_termination_request) to NOT be finalizable by some
user's catch()-without-rethrow. 

regards,
alexander.