From owner-freebsd-bugs  Sun Feb  3  0:20: 8 2002
Delivered-To: freebsd-bugs@freebsd.org
Received: from relay1.macomnet.ru (relay1.macomnet.ru [195.128.64.10])
	by hub.freebsd.org (Postfix) with ESMTP
	id 34EB137B417; Sun,  3 Feb 2002 00:19:46 -0800 (PST)
Received: from news1.macomnet.ru (news1.macomnet.ru [195.128.64.14])
	by relay1.macomnet.ru (8.11.3/8.11.3) with ESMTP id g138JeO6485267;
	Sun, 3 Feb 2002 11:19:40 +0300 (MSK)
Date: Sun, 3 Feb 2002 11:19:39 +0300 (MSK)
From: Maxim Konovalov <maxim@macomnet.ru>
To: David Malone <dwmalone@maths.tcd.ie>
Cc: roam@FreeBSD.ORG, <yxpan@yahoo.com>, <freebsd-bugs@FreeBSD.ORG>
Subject: Re: i386/34536: accept() blocks other threads
In-Reply-To: <20020203011345.G59736-100000@news1.macomnet.ru>
Message-ID: <20020203110107.P50975-100000@news1.macomnet.ru>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: owner-freebsd-bugs@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-bugs.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-bugs>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-bugs>
X-Loop: FreeBSD.org


By the way, I cannot reproduce the problem. I tried on -current and
old 4.3 a code below, it works as expected:

/* This is just a test program
 * Compile:
 *	cc -o thread thread.c -pthread
 * Test:
 *	./thread 90
 *	telnet localhost 90
 */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#include <netdb.h>
#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

void *
bg(void *a)
{
	for (;;) {
		printf("+"); fflush(NULL);
		sleep(1);
	}
}

void *
srv(void *arg)
{
	char buff[100];

	printf("Begin to read\n");
	count=read((int)arg, buff, 10);
	close((int)arg);
	printf("Begin to exit\n");
}

main(int argc, char *argv[]){
    int sock, newsock, length, port,pid, i;
    struct sockaddr_in addr, daddr;
    pthread_t ptid;
    pthread_attr_t tattr;

    if(argc==1) {
	printf("Usage:\n	%s Port\n", argv[0]);
	exit(1);
    }

    port=atoi(argv[1]);
    if(port==0){
	printf("Illegal Port:%s\n", argv[1]);
	exit(1);
    }

    sock=socket(AF_INET, SOCK_STREAM,0);
    if(sock < 0){
		perror("Opening stream socket");
		exit(1);
    }

    bzero(&addr, sizeof(addr));
    addr.sin_family=AF_INET;
    addr.sin_addr.s_addr = htonl(INADDR_ANY);
    addr.sin_port = htons(port);
    if(bind(sock, (struct sockaddr *)&addr, sizeof addr) == -1){
		perror("Binding stream socket");
		exit(1);
    };

    bzero(&addr, sizeof(addr));
    i = sizeof(addr);
    if(getsockname(sock, (struct sockaddr *)&addr, &i) < 0){
	perror("getsockname");
	exit(1);
    }

    if(listen(sock, 5) == -1){
	perror("Listening stream socket");
	exit(1);
    };

    pthread_attr_init(&tattr);
    pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED);
    pthread_attr_setscope(&tattr, PTHREAD_SCOPE_SYSTEM);

    pthread_create(&ptid, NULL, bg, NULL);

    while((newsock=accept(sock, (struct sockaddr *)&daddr, (length=sizeof daddr, &length))) != -1){
	printf("Main Thread is going to start a new thread\n");
	if(pthread_create(&ptid, &tattr, srv, (void *)newsock)){
	    printf("pthread_create() failed\n");
	    close(newsock);
	}
    }

    /* never reached */
    close(sock);
}

Here is an output:

[maxim@try maxim]$ ./thread 2000
+++++Main Thread is going to start a new thread
Begin to read
+++Main Thread is going to start a new thread
Begin to read
+++Begin to exit
+++Begin to exit
+^C
[maxim@try maxim]$

So all four threads are sheduled. I guess there may by libc/libc_r
interoperability somewhere.

-- 
Maxim Konovalov, MAcomnet, Internet-Intranet Dept., system engineer
phone: +7 (095) 796-9079, mailto: maxim@macomnet.ru


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-bugs" in the body of the message