Date: Thu, 25 May 2006 11:58:34 -0400 From: Kurt Miller <lists@intricatesoftware.com> To: freebsd-threads@freebsd.org Subject: close() socket deadlocks blocked threads Message-ID: <200605251158.34553.lists@intricatesoftware.com>
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Here's the other deadlock I mentioned. When a thread
is blocked waiting for data on a socket and another
thread closes the socket, the blocked thread remains
blocked indefinitely. Both kse and thr have this
issue. c_r returns with -1 errno==EBADF. Solaris
returns with -1 errno==0.
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <sys/param.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <pthread.h>
static void *
start_routine(void *arg)
{
int sock1 = (int)arg;
struct sockaddr remote_addr;
char readBuf;
int n, remote_addr_len = sizeof(struct sockaddr);
n = recvfrom(sock1, &readBuf, 1, 0, &remote_addr, &remote_addr_len);
if (n == -1) {
printf("unblocked with errno = %d\n", errno);
}
return (0);
}
void
buildAddr4(struct sockaddr_in *addr4, int address, short port) {
memset((char *) addr4, 0, sizeof(struct sockaddr_in));
addr4->sin_port = htons(port);
addr4->sin_addr.s_addr = (uint32_t) htonl(address);
addr4->sin_family = AF_INET;
}
int
main() {
int sock1;
struct sockaddr addr;
pthread_t thread1;
void *value_ptr;
buildAddr4((struct sockaddr_in *)&addr, 0, 0);
if ((sock1 = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
exit(1);
if (bind(sock1, (struct sockaddr *)&addr, sizeof(struct sockaddr_in)) != 0)
exit(1);
pthread_create(&thread1, NULL, start_routine, (void *)sock1);
sleep(1);
close(sock1);
pthread_join(thread1, &value_ptr);
return (0);
}
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