[848] in Pthreads mailing list archive
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daemon@ATHENA.MIT.EDU (teng_mt@188.net)
Tue Aug 10 22:53:06 1999
Date: 11 Aug 1999 02:31:58 -0000
Reply-To: teng_mt@188.net
From: teng_mt@188.net
To: pthreads@MIT.EDU
Dear Sr.
How can I send signal between threads in a process?
My developing platform is DEC Unix 4.0, I use pthread_kill(pthread_t id,int sig_id) to send signal to a thread, but a message "Hangup" will emerge when call the function above and all program will exit, why?
My program is:
#include <pthread.h>
pthread_t timer_id;
pthread_t scanner_id;
pthread_t runner_id;
pthread_attr_t attr;
sigset_t new;
void *timer_func(void *vp);
void *scanner_func(void *vp);
void *runner_func(void *vp);
main()
{
sigemptyset(&new);
sigaddset(&new,SIGUSR1);
pthread_sigmask(SIG_BLOCK, &new,NULL);*/
if(pthread_create(&timer_id,attr,timer_func,NULL) != 0)
perror("Create timer");
if(pthread_create(&scanner_id,attr,scanner_func,NULL) != 0)
perror("Create scanner");
if(pthread_create(&runner_id,attr,runner_func,NULL) != 0)
perror("Create runner");
while(1)
sleep(10);
} /* end main */
void* timer_func(void *vp)
{
printf("in timer_func\n");
while(1)
{
if(pthread_kill(scanner_id,SIGUSR1) != 0)
perror("timer");
sleep(8);
}
}
void *scanner_func(void *vp)
{
int sig_id;
printf("in scanner_func\n");
while(1)
{
sigwait(&new,&sig_id);
printf("scanner wait for %d\n",sig_id);
pthread_kill(runner_id,SIGUSR1);
}
}
void *runner_func(void *vp)
{
int sig_id;
printf("in runner_func\n");
while(1)
{
sigwait(&new,&sig_id);
printf("runner wait for %d\n",sig_id);
}
}
My another question is about "pthread_attr_t attr" in program above.
pthread_attr_t attr variable must be declared in global and can not be initialized(call "pthread_attr_init()"), otherwise pthread_create will abort(error message "Invalid parameters").
Compiler will report errors if call pthread_create as
pthread_create(&thread_id, NULL, timer_func, NULL), compiler's error is
""0" is of type "long", and may not be converted to "struct CMA_T_HANDLE". pthread_create(&t, NULL, sigint, NULL);".
Thanks lot!
My e-mail: teng_mt@188.net
Teng mintang, from Hangzhou P.R.China
1999/08/11
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