User:Kr/exit race.c

A race between threads and the "exit" call ...

[cpp] /*Solaris:

 > cc exit_race.c -o exit_race.bin
 > ./exit_race.bin
 main - tid: 1
 foo - tid: 2
 bar - tid: 2
 main - ad: 1

 Linux:
 > gcc -g exit_race.c -lpthread
 > ./exit_race.bin 
 main - tid: b7ddbac0
 foo - tid: b7ddab90
 bar - tid: b7ddab90
 main - ad: 1

• /

1. include <pthread.h>
2. include <stdio.h>
3. include <stdlib.h>
4. include <unistd.h>

1. ifdef __PRETTY_FUNCTION__
2. define PFUN __PRETTY_FUNCTION__
3. else
4. define PFUN __func__
5. endif

static void * foo(void * gr) {

   fprintf(stderr, "%s - tid: %x\n", PFUN, pthread_self());

   sleep(5);

   exit(0);

}

static volatile int ad = 0;

1. ifdef __GNUC__

static void bar(void) __attribute__((destructor));

1. endif

static void bar(void) {

   fprintf(stderr, "%s - tid: %x\n", PFUN, pthread_self());

   ad = 1;

   sleep(5); // this just stands for some slow de-initialization

}

1. ifdef __SUNPRO_C
2. pragma fini(bar)
3. endif

static pthread_t bt;

static void main_cleanup(void * gr) {

   fprintf(stderr, "%s - tid: %x\n", PFUN, pthread_self());

}

int main() {

   fprintf(stderr, "%s - tid: %x\n", PFUN, pthread_self());

   pthread_create(&bt, NULL, foo, NULL);

   while (!ad) ; // Busy wait for ad to change!

   fprintf(stderr, "%s - ad: %i\n", PFUN, ad);

   pthread_exit(NULL);

}