Re: Signal mask restore anomaly

On Wed, 16 Aug 2000, Frank Jas wrote:

Under certain circumstances, a signal blocked while a
signal handler is executing will not be restored.

Hmm... I think I may be seeing something similar to this as well.  It
could explain some very strange behaviour I'm seeing in my alarm handler.

The following execution sequence leads to the anomalous behavior.


Trigger the SIGTSTP handler with a ^Z
While executing the handler, deliver a ^Z and ^C
Hit return to return from the handler.
Another instance of the SIGTSTP handler should execute.
Hit return to return from that instance of the handler.
Notice that the SIGINT handler does not execute and should have.
Any subsequent SIGINT are apparently blocked.

I'm almost sure I'm seeing this.  Except for me, it's a 10/sec. alarm
handler and a SIGUSR2 that only occurs occasionally.  Major hair rippage.
Let me know if anybody sees what's up.  Until then, I may stop blocking
SIGUSR2 and see if that helps one of my two problems.  :-)


Later,
David

---------------------------------------------------------------------
A brief Haiku:

Microsoft is bad.
It seems secure at first glance.
Then you read your mail.


** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/