Date: Wed, 26 Jan 2005 12:20:24 GMT From: =?koi8-r?B?7MXPztTYxdcg88XSx8XKIOXGyc3P18ne?= <lse@cryptopro.ru> To: freebsd-threads@FreeBSD.org Subject: Re: threads/76690: fork hang in child for (-lc_r & -lthr) Message-ID: <200501261220.j0QCKOBc059484@freefall.freebsd.org>
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The following reply was made to PR threads/76690; it has been noted by GNATS.
From: =?koi8-r?B?7MXPztTYxdcg88XSx8XKIOXGyc3P18ne?= <lse@cryptopro.ru>
To: <freebsd-gnats-submit@FreeBSD.org>,
=?koi8-r?B?7MXPztTYxdcg88XSx8XKIOXGyc3P18ne?= <lse@cryptopro.ru>
Cc:
Subject: Re: threads/76690: fork hang in child for (-lc_r & -lthr)
Date: Wed, 26 Jan 2005 15:18:38 +0300
Hi,
Sorry, program in section "How-To-Repeat" hang only on "-lc_r" library.
Hang for library -lthr cause by malloc()/free() in child, not fork() =
internally.
"Correct" version "How-To-Repeat" program:
# This is a shell archive. Save it in a file, remove anything before
# this line, and then unpack it by entering "sh file". Note, it may
# create directories; files and directories will be owned by you and
# have default permissions.
#
# This archive contains:
#
# fork-malloc-free.c
#
echo x - fork-malloc-free.c
sed 's/^X//' >fork-malloc-free.c << 'END-of-fork-malloc-free.c'
X#include <errno.h>
X#include <pthread.h>
X#include <signal.h>
X#include <stdlib.h>
X#include <stdio.h>
X#include <sys/wait.h>
X#include <unistd.h>
X
Xconst int INFL =3D 1000000000;
Xconst int PTHR =3D 4;
Xconst int NATR =3D 2;
X
X#ifndef SEMI_OK // if SEMI_OK not defined - >95% hang on =
my syst
em
Xconst int FRKL =3D 100;
Xconst int CHLD =3D 100;
X#else // if SEMI_OK defined - 50% hang on my system
Xconst int FRKL =3D 3;
Xconst int CHLD =3D 3;
X#endif
X
Xvoid *malloc_free(void *pvcnt)
X{
X volatile sig_atomic_t *pscnt =3D (volatile sig_atomic_t *)pvcnt;
X int n =3D *pscnt;
X int i;
X void *m;
X
X for(i =3D 0; i < n; i++){
X m =3D malloc(10);
X *pscnt =3D i;
X free(m);
X }
X return NULL;
X}
X
Xint main (void)
X{
X pthread_attr_t attrs[NATR];
X pthread_t thread_id;
X volatile sig_atomic_t cnt[PTHR];
X int i;
X int cntr;
X pid_t pid, savedpid;
X int pstat;
X
X pthread_attr_init(&attrs[0]);
X pthread_attr_setdetachstate(&attrs[0], PTHREAD_CREATE_DETACHED);
X pthread_attr_setscope(&attrs[0], PTHREAD_SCOPE_PROCESS);
X pthread_attr_init(&attrs[1]);
X pthread_attr_setdetachstate(&attrs[1], PTHREAD_CREATE_DETACHED);
X pthread_attr_setscope(&attrs[1], PTHREAD_SCOPE_SYSTEM);
X for(i =3D 0; i < PTHR; i++) {
X cnt[i] =3D INFL;
X if(pthread_create(&thread_id, &attrs[i%NATR],
X &malloc_free, (void *)&cnt[i])){
X perror("pthread_create:");
X return 1;
X }
X }
X fprintf(stderr, "Threads created.\n");
X
X for (i =3D 0; i < FRKL; i++) {
X fprintf(stderr, "forking\n");
X switch(pid =3D fork()) {
X case -1: /* error */
X perror("fork fail:");
X return 2;
X case 0: /* child */
X // -lc_r:
X // Child don't anything to work - simple exit
X // When child hang, this hang in fork code
X //
X // -lthr:
X // Child hang by malloc()/free();
X cntr =3D CHLD;
X malloc_free(&cntr);
X _exit(0);
X default: /* parent */
X savedpid =3D pid;
X do{
X pid =3D waitpid(savedpid, &pstat, 0);
X }while(pid =3D=3D -1 && errno =3D=3D EINTR);
X break;
X }
X }
X fprintf(stderr, "Threads OK:");
X for(i =3D 0; i < PTHR; i++){
X fprintf(stderr, " %d", (int)cnt[i]);
X }
X fprintf(stderr, "\n");
X _exit(0);
X return 0;
X}
END-of-fork-malloc-free.c
exit
--
Sorry for my bests English.
Serguei E. Leontiev w:+7(095)289-4367 USSR, Moscow, 127018, Obraztsova =
38
Crypto-Pro=9A=9A=9A=9A=9A=9A=9A=9A=9A w:+7(095)933-1168
<http://CryptoPro.ru>; m:+7(916)686-1081 SMS: <http://www.mts.ru/sms>;
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p:+7(095)231-3838 for abonent +7(916)686-1081
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=9A=9A=9A=9A=9A=9A=9A=9A=9A=9A=9A=9A<http://lnfm1.sai.msu.ru/~leo>;
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