Date: Tue, 22 Feb 2005 20:00:40 GMT From: Dong Xuezhang-A19583 <xdong@motorola.com> To: freebsd-threads@FreeBSD.org Subject: Re: threads/72953: fork() unblocks blocked signals w/o PTHREAD_SC OPE_SYSTEM Message-ID: <200502222000.j1MK0e46033113@freefall.freebsd.org>
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The following reply was made to PR threads/72953; it has been noted by GNATS.
From: Dong Xuezhang-A19583 <xdong@motorola.com>
To: freebsd-gnats-submit@FreeBSD.org, marka@daemon.lab.isc.org
Cc:
Subject: Re: threads/72953: fork() unblocks blocked signals w/o PTHREAD_SC
OPE_SYSTEM
Date: Tue, 22 Feb 2005 12:57:15 -0700
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This is not a bug. If you insert a sleep call before the line of kill singal, you will get consistent behavior of "singal 15".
Actually fork() donot copy the properties of singal mask, so it never been a case of singal 15 been blocked. The reason of sometime the singal donot get print out is because of race condition in two thread. The reason it "works" at Linux is because of a BUG in Linux which donot deliver the singal to all threads.
I modify the code to demostrate two thread case and two process case. You will notice that twothread.c will have different behavior in Linux vs. Freebsd.
======= twothread.c==============
#include <pthread.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <stdlib.h>
sigset_t signal_mask;
static void *
waiter(void *arg) {
int result;
int sig;
result = sigwait(&signal_mask, &sig);
if (result != 0)
fprintf(stdout, "child thread sigwait: %\n", strerror(result));
else
fprintf(stdout, "child thread signal %d\n", sig);
fflush(stdout);
return (NULL);
}
int
main(int argc, char **argv) {
pthread_t id;
pthread_attr_t attr;
int result;
int scope = 0;
if (argc > 1) {
if (strcmp(argv[1], "system") == 0)
scope = 1;
}
sigemptyset (&signal_mask);
sigaddset (&signal_mask, SIGTERM);
result = sigprocmask(SIG_BLOCK, &signal_mask, NULL);
if (result != 0)
fprintf(stdout, "pthread_sigmask: %\n", strerror(result));
else
fprintf(stdout, "pthread_sigmask: OK\n");
fflush(stdout);
result = pthread_attr_init(&attr);
if (result != 0)
fprintf(stdout, "pthread_attr_init: %\n", strerror(result));
else
fprintf(stdout, "pthread_attr_init: OK\n");
fflush(stdout);
if (scope) {
result = pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
if (result != 0)
fprintf(stdout, "pthread_attr_setscope: %\n",
strerror(result));
else
fprintf(stdout, "pthread_attr_setscope: OK\n");
} else
fprintf(stdout, "default scope\n");
fflush(stdout);
result = pthread_create (&id, &attr, waiter, NULL);
if (result != 0)
fprintf(stdout, "pthread_create: %\n", strerror(result));
else
fprintf(stdout, "pthread_create: OK\n");
fflush(stdout);
sleep(1);
if (kill(getpid(), SIGTERM) == -1)
perror("kill");
else
fprintf(stdout, "kill: OK\n");
fflush(stdout);
result = pthread_join(id, NULL);
if (result != 0)
fprintf(stdout, "pthread_join: %\n", strerror(result));
else
fprintf(stdout, "pthread_join: OK\n");
fflush(stdout);
sleep(1);
return(0);
}
======= twoprocess.c==============
#include <pthread.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <stdlib.h>
sigset_t signal_mask;
int childpid;
void
dofork() {
int result;
int sig;
childpid = fork();
switch (childpid) {
case 0:
result = sigwait(&signal_mask, &sig);
if (result != 0)
fprintf(stdout, "sigwait: %\n", strerror(result));
else
fprintf(stdout, "signal %d\n", sig);
fflush(stdout);
_exit(0);
case -1:
// some error
_exit(1);
default:
// parent process
fprintf(stdout, "fork, in parent process\n");
fflush(stdout);
break;
}
}
int
main(int argc, char **argv) {
pthread_t id;
pthread_attr_t attr;
int result;
sigemptyset (&signal_mask);
sigaddset (&signal_mask, SIGTERM);
result = sigprocmask(SIG_BLOCK, &signal_mask, NULL);
if (result != 0)
fprintf(stdout, "pthread_sigmask: %\n", strerror(result));
else
fprintf(stdout, "pthread_sigmask: OK\n");
fflush(stdout);
dofork();
sleep(1);
if (kill(childpid, SIGTERM) == -1)
perror("kill");
else
fprintf(stdout, "kill: OK\n");
fflush(stdout);
return(0);
}
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