Date: Tue, 7 Mar 2006 16:17:28 GMT From: john gladkih <john@kak-sam.to> To: freebsd-gnats-submit@FreeBSD.org Subject: threads/94176: KSE: sigwait doesn't recieve SIGWINCH sent by pthread_kill() or kill -WINCH Message-ID: <200603071617.k27GHSM5000487@www.freebsd.org> Resent-Message-ID: <200603071620.k27GK4pj039131@freefall.freebsd.org>
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>Number: 94176
>Category: threads
>Synopsis: KSE: sigwait doesn't recieve SIGWINCH sent by pthread_kill() or kill -WINCH
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-threads
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Mar 07 16:20:04 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator: john gladkih
>Release: 5.4-RELEASE, 5.3-RELEASE
>Organization:
>Environment:
FreeBSD freebsd54.i.drweb.ru 5.4-RELEASE FreeBSD 5.4-RELEASE #0: Sun May 8 10:21:06 UTC 2005 root@harlow.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC i386
>Description:
sigwait() doesn't recieve SIGWINCH (SIGIO and maybe some others signal) sent by pthread_kill() from another thread or even from kill -WINCH. there is no such issue on 5.2.1 and older with libc_r.
>How-To-Repeat:
[~]> cat t.cc
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
sigset_t blk;
void *thread( void* ) {
pthread_sigmask( SIG_BLOCK, &blk, NULL );
printf( "sigwait()\n" );
int sig, rc = sigwait( &blk, &sig );
printf( "got %d (rc=%d)\n", sig, rc );
printf( "no bug!\n" );
_exit( 0 );
}
int main() {
sigemptyset( &blk );
sigaddset( &blk, SIGWINCH );
sigprocmask( SIG_BLOCK, &blk, NULL );
pthread_sigmask( SIG_BLOCK, &blk, NULL );
pthread_attr_t attr;
pthread_t tid;
pthread_attr_init( &attr );
pthread_attr_setdetachstate( &attr, PTHREAD_CREATE_DETACHED );
pthread_attr_setscope( &attr, PTHREAD_SCOPE_SYSTEM );
printf( "pthread_create=%d\n", pthread_create( &tid, &attr, thread, 0 ) );
pthread_attr_destroy( &attr );
sleep( 5 );
printf( "pthread_kill=%d\n", pthread_kill( tid, SIGWINCH ) );
sleep( 5 );
printf( "bug!\n" );
return 1;
}
[~]> g++ -o t t.cc -lpthread
[~]> ./t
sigwait()
pthread_create=0
pthread_kill=0
bug!
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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