tree c8a9d3da21cde79392f261b032a1cd2924673e35
parent bcc44e25499d03b9d85b5fd5f07f8323934a75b8
author Igor Sysoev <igor@sysoev.ru> 1257363668 +0000
committer Igor Sysoev <igor@sysoev.ru> 1257363668 +0000

Fix a bug introduced in r2032: After a child process has read a terminate
message from a channel, the process tries to read the channel again.
The kernel (at least FreeBSD) may preempt the process and sends a SIGIO
signal to a master process. The master process sends a new terminate message,
the kernel switches again to the the child process, and the child process
reads the messages instead of an EAGAIN error. And this may repeat over
and over. Being that the child process can not exit the cycle and test
the termination flag set by the message handler.

The fix disallow the master process to send a new terminate message on
SIGIO signal reception. It may send the message only on SIGALARM signal.