RTEMS | pthread_cancel behavior inconsistency with POSIX (#5181)

[yang zhang (@yang.zhang)]

yang zhang created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5181



## Summary
I use a sample code in  man pthread_cancel to test pthread_cancle it rtems, but it  can't work.

## Steps to reproduce
1. I reusing posix testcases -- psxcancel
2. Modify in by sample code in man pthread_cancel
3. Check the output log, it should be as below:
thread_func(): started; cancellation disabled
main(): sending cancellation request
thread_func(): about to enable cancellation
main(): thread was canceled

But actually, it's as below:
thread_func(): started; cancellation disabled
main(): sending cancellation request
thread_func(): about to enable cancellation
//sleep 100s
thread_func(): not canceled!
main(): thread wasn't canceled (shouldn't happen!)

## Information
As man pthread_cancel say
"If  a thread has disabled cancellation, then a cancellation request remains queued until the thread enables  cancellation."
" Deferred  cancelability means  that  cancellation will be delayed until the thread next calls a function that is a cancellation point. "
"  Cancellation points
       POSIX.1  specifies  that  certain  functions  must, and certain
       other functions may, be cancellation points.  If  a  thread  is
       cancelable, its cancelability type is deferred, and a cancella‐
       tion request is pending for the thread, then the thread is can‐
       celed when it calls a function that is a cancellation point."

//the test case for rtems
[pthread_cancel.diff](/uploads/3802221a7da3d2e8b85d35e8477158dc/pthread_cancel.diff)
//the sample code in man pthread_cancel
[test_cancel_posix.c](/uploads/96a574a3d50ddd4d06e4b809ef3a4237/test_cancel_posix.c)

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5181
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