Date: 28 Aug 2002 12:06:10 -0400 From: Joe Marcus Clarke <marcus@marcuscom.com> To: "Henning, Brian" <brian.henning@navitaire.com> Cc: "(E-mail)" <questions@FreeBSD.ORG> Subject: Re: pthreads compiler warnings Message-ID: <1030550771.329.1.camel@gyros.marcuscom.com> In-Reply-To: <E1846117A30764468D2192D5A48541CC03894D09@exchange.Navitaire.com> References: <E1846117A30764468D2192D5A48541CC03894D09@exchange.Navitaire.com>
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On Wed, 2002-08-28 at 09:40, Henning, Brian wrote:
> Hello-
> i am trying to run the following code but, when i do i get these errors.
> Am i linking to the wrong library or doing something wrong? I read the man
> pages and it said to use libc_r
> for a threaded user program.
Don't explicitly link libc into your application. For example, on
-stable, you should compile this like:
> cc -o xxx -pthread xxx.c
On -current:
> cc -o xxx -lc_r xxx.c
Joe
> thanks,
> brian
>
> > gcc thread_example.c -lc_r
> /usr/lib/libc.so: WARNING! setkey(3) not present in the system!
> /usr/lib/libc.so: warning: this program uses gets(), which is unsafe.
> /usr/lib/libc.so: warning: mktemp() possibly used unsafely; consider using
> mkstemp()
> /usr/lib/libc.so: WARNING! des_setkey(3) not present in the system!
> /usr/lib/libc.so: WARNING! encrypt(3) not present in the system!
> /usr/lib/libc.so: warning: tmpnam() possibly used unsafely; consider using
> mkstemp()
> /usr/lib/libc.so: warning: this program uses f_prealloc(), which is not
> recommended.
> /usr/lib/libc.so: WARNING! des_cipher(3) not present in the system!
> /usr/lib/libc.so: warning: tempnam() possibly used unsafely; consider using
> mkstemp()
>
>
>
>
> #include <stdio.h>
> #include <pthread.h>
>
> #define NUM_THREADS 3
>
> void *BusyWork(void *null) {
> int i;
> double result = 0.0;
> for( i = 0; i < 1000000; i++ ) {
> result = result + (double)random();
> }
> printf("result = %d\n",result);
> pthread_exit((void *) 0);
> }
>
> int main( int argc, char *argv[] ) {
> pthread_t thread[NUM_THREADS];
> pthread_attr_t attr;
> int rc, t, status;
>
> /* Initialize and set thread detached attribute */
> pthread_attr_init(&attr);
> pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
>
> for( t = 0; t < NUM_THREADS; t++ ) {
> printf("Creating thread %d\n", t);
> rc = pthread_create(&thread[t], &attr, BusyWork, NULL);
> if (rc) {
> printf("ERROR; return code from pthread_create() is %d\n", rc);
> exit(-1);
> }
> }
>
> /* Free attribute and wait for the other threads */
> pthread_attr_destroy(&attr);
> for( t = 0; t < NUM_THREADS; t++ ) {
> rc = pthread_join(thread[t], (void **)&status);
> if (rc) {
> printf("ERROR; return code from pthread_join() is %d\n", rc);
> exit(-1);
> }
> printf("Completed join with thread %d status= %d\n",t, status);
> }
>
> pthread_exit(NULL);
> return 0;
> }
>
>
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