'Re: threads/75273: FBSD 5.3 libpthread (KSE) bug'

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List:       freebsd-threads
Subject:    Re: threads/75273: FBSD 5.3  libpthread (KSE) bug
From:       "Enoch W." <ixew () hotmail ! com>
Date:       2004-12-22 4:30:35
Message-ID: 200412220430.iBM4UZaY074828 () freefall ! freebsd ! org
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The following reply was made to PR threads/75273; it has been noted by GNATS.

From: "Enoch W." <ixew@hotmail.com>
To: <freebsd-gnats-submit@FreeBSD.org>, <ixew@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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 <DIV><FONT face=Arial size=2>Problem demo is attached, as requested.  TIA, 
 Enoch.</FONT></DIV></BODY></HTML>

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 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <signal.h>
 #include <errno.h>
 #include <pthread.h>

 #define ASSRET(cond) do { \
   if (!(cond)) { \
     fprintf(stderr,  "ASSRET ERROR @ %d -> %s\n", __LINE__, \
 	    strerror(ret == -1 ? errno : ret)); \
     exit(EXIT_FAILURE); \
   } \
 } while (0)

 int tock;

 void tick()
 {
   tock = 1;
 }

 void *pulse(void *arg)
 {
   int ret;
   struct itimerval it;
   sigset_t set;

   sigemptyset(&set);
   sigaddset(&set, SIGALRM);
   ret = sigprocmask(SIG_BLOCK, &set, NULL);
   ASSRET(ret == 0);
   sigemptyset(&set);

   it.it_interval.tv_sec = 1;
   it.it_interval.tv_usec = 0;
   it.it_value.tv_sec = 1;
   it.it_value.tv_usec = 0;
   ret = setitimer(ITIMER_REAL, &it, NULL);
   ASSRET(ret == 0);

   while (1) {
     while (!tock)
       sigsuspend(&set);
     tock = 0;
     putchar('*');
     fflush(stdout);
   }
 }

 int main()
 {
   int ret;
   pthread_attr_t attr;
   pthread_t thread;

   ret = pthread_attr_init(&attr);
   ASSRET(ret == 0);
   ret = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
   ASSRET(ret == 0);

   signal(SIGALRM, tick);

   ret = pthread_create(&thread, NULL, pulse, NULL);
   ASSRET(ret == 0);

   printf("Press Enter to cancel the pulse() thread\n");
   while (getchar() != '\n');

   ret = pthread_cancel(thread);
   ASSRET(ret == 0);
   ret = pthread_join(thread, NULL);
   ASSRET(ret == 0);

   printf("Press Enter to end\n");
   while (getchar() != '\n');
   return 0;
 }

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

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