Third-party libraries

Third-party libraries

Posted Aug 27, 2009 23:10 UTC (Thu) by quotemstr (subscriber, #45331)
In reply to: Third-party libraries by giraffedata
Parent article: In brief

Or you just do this (error checks omitted):

#include <pthread.h>

static int fd = -1;
static pthread_mutex_t fd_lock = PTHREAD_MUTEX_INITIALIZER;

static void mylib_beforefork() {
    pthread_mutex_lock(&fd_lock);
}

static void mylib_afterfork() {
    pthread_mutex_unlock(&fd_lock);
}

void mylib_dosomething() {
    pthread_mutex_lock(&fd_lock);
    if(fd == -1) {
        pthread_atfork(mylib_beforefork, 
                       mylib_afterfork, 
                       mylib_afterfork);
        fd = open(...);
        fcntl(fd, F_SETFD, O_CLOEXEC);
    }
    pthread_mutex_unlock(&fd_lock);

    do_something(fd);
}

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