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timer_create / POSIX non conformance ?
- From: claude dot roblez at free dot fr
- To: cygwin at cygwin dot com
- Date: Thu, 6 Jan 2005 14:50:42 +0100
- Subject: timer_create / POSIX non conformance ?
The problem appears with the [timer_create] function called with a [sigevent]
structure having its [sigev_notify] member set to [SIGEV_THREAD].
In this case, the function pointed to by the [sigev_notify_function] member is
prototyped [void(*)(union sigval)] and should receive the [sigev_value] member.
(according to "The Open Group Base Specifications Issue 6 IEEE Std 1003.1, 2004
Edition")
On various Linux systems (Debian, Fedora...), the behaviour is appropriate.
Under Cygwin, in order to perform correctly, I have to declare my function :
static void SignalTimer(union sigval *sig)
instead of : static void SignalTimer(union sigval sig).
Actually, the function receives a pointer to the sigev_value member rather than
the union itself.
I had a glance at the cygwin source code (file: timer.cc)
case SIGEV_THREAD:
{
pthread_t notify_thread;
debug_printf ("%p starting thread", x);
int rc = pthread_create (¬ify_thread,
tt.evp.sigev_notify_attributes,(void * (*) (void *))
tt.evp.sigev_notify_function,&tt.evp.sigev_value);
The last argument: [&tt.evp.sigev_value] is probably wrong (passing an address)
FYI: installed cygwin 1.5.12-1 on XP SP2
Any comments and/or a fix in an upcoming snapshot or release will be
appreciated.
Claude Roblez
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