05-30-2012
I see. Thanks. I will.
One other thing, if I cancel a thread, I have to consider the possibility that there could be an unanticipated scenario in which the thread no longer exists at the instant when I cancel it, even if thought I was doing appropriate checking for existence. In a test I did, cancelling a non-existent thread caused a segfault which caused the parent to exit. I tried to trap signals to prevent the parent from abending using SIG_IGN, but it abended anyway. Do you know if such a thing is possible. I did work up a scheme which should prevent ever cancelling a non-existent thread, but I would feel more comfortable if that situation were covered.
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LEARN ABOUT SUNOS
thr_kill
thr_kill(3C) thr_kill(3C)
NAME
thr_kill - send a signal to a thread
SYNOPSIS
cc -mt [ flag... ] file... [ library... ]
#include <signal.h>
#include <thread.h>
int thr_kill(thread_t thread, int sig);
The thr_kill() function sends the sig signal to the thread designated by thread. The thread argument must be a member of the same process
as the calling thread. The sig argument must be one of the signals listed in signal.h(3HEAD), with the exception of SIGCANCEL being
reserved and off limits to thr_kill(). If sig is 0, a validity check is done for the existence of the target thread; no signal is sent.
Upon successful completion, thr_kill() returns 0. Otherwise, an error number is returned. In the event of failure, no signal is sent.
The thr_kill() function will fail if:
EINVAL The sig argument value is not zero and is an invalid or an unsupported signal number.
ESRCH No thread was found that corresponded to the thread designated by thread ID.
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|MT-Level |Async-Signal-Safe |
+-----------------------------+-----------------------------+
kill(2), sigaction(2), raise(3C), signal.h(3HEAD), thr_self(3C), attributes(5), standards(5)
23 Mar 2005 thr_kill(3C)