threads/75273: FBSD 5.3 libpthread (KSE) bug

Tue Dec 21 20:30:35 PST 2004

The following reply was made to PR threads/75273; it has been noted by GNATS.

From: "Enoch W." <ixew at hotmail.com>
To: <freebsd-gnats-submit at FreeBSD.org>, <ixew at hotmail.com>
Cc:  
Subject: Re: threads/75273: FBSD 5.3  libpthread (KSE) bug
Date: Tue, 21 Dec 2004 23:26:28 -0500

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 Problem demo is attached, as requested. TIA, Enoch.
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 Enoch.</FONT></DIV></BODY></HTML>

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 #include <stdio.h>=0A=
 #include <stdlib.h>=0A=
 #include <string.h>=0A=
 #include <signal.h>=0A=
 #include <errno.h>=0A=
 #include <pthread.h>=0A=
 =0A=
 #define ASSRET(cond) do { \=0A=
   if (!(cond)) { \=0A=
     fprintf(stderr,  "ASSRET ERROR @ %d -> %s\n", __LINE__, \=0A=
 	    strerror(ret =3D=3D -1 ? errno : ret)); \=0A=
     exit(EXIT_FAILURE); \=0A=
   } \=0A=
 } while (0)=0A=
 =0A=
 int tock;=0A=
 =0A=
 void tick()=0A=
 {=0A=
   tock =3D 1;=0A=
 }=0A=
 =0A=
 void *pulse(void *arg)=0A=
 {=0A=
   int ret;=0A=
   struct itimerval it;=0A=
   sigset_t set;=0A=
 =0A=
   sigemptyset(&set);=0A=
   sigaddset(&set, SIGALRM);=0A=
   ret =3D sigprocmask(SIG_BLOCK, &set, NULL);=0A=
   ASSRET(ret =3D=3D 0);=0A=
   sigemptyset(&set);=0A=
 =0A=
   it.it_interval.tv_sec =3D 1;=0A=
   it.it_interval.tv_usec =3D 0;=0A=
   it.it_value.tv_sec =3D 1;=0A=
   it.it_value.tv_usec =3D 0;=0A=
   ret =3D setitimer(ITIMER_REAL, &it, NULL);=0A=
   ASSRET(ret =3D=3D 0);=0A=
 =0A=
   while (1) {=0A=
     while (!tock)=0A=
       sigsuspend(&set);=0A=
     tock =3D 0;=0A=
     putchar('*');=0A=
     fflush(stdout);=0A=
   }=0A=
 }=0A=
 =0A=
 int main()=0A=
 {=0A=
   int ret;=0A=
   pthread_attr_t attr;=0A=
   pthread_t thread;=0A=
 =0A=
   ret =3D pthread_attr_init(&attr);=0A=
   ASSRET(ret =3D=3D 0);=0A=
   ret =3D pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);=0A=
   ASSRET(ret =3D=3D 0);=0A=
 =0A=
   signal(SIGALRM, tick);=0A=
 =0A=
   ret =3D pthread_create(&thread, NULL, pulse, NULL);=0A=
   ASSRET(ret =3D=3D 0);=0A=
 =0A=
   printf("Press Enter to cancel the pulse() thread\n");=0A=
   while (getchar() !=3D '\n');=0A=
 =0A=
   ret =3D pthread_cancel(thread);=0A=
   ASSRET(ret =3D=3D 0);=0A=
   ret =3D pthread_join(thread, NULL);=0A=
   ASSRET(ret =3D=3D 0);=0A=
 =0A=
   printf("Press Enter to end\n");=0A=
   while (getchar() !=3D '\n');=0A=
   return 0;=0A=
 }=0A=

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 demo: demo.c=0A=
 	$(CC) -Wall -g -odemo -pthread demo.c=0A=

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