thread joinability

#include <pthread.h>

int check_thread_joinable(pthread_t thread) {
    pthread_attr_t attr;
    int detachstate;
    int result;

    // Get thread attributes
    result = pthread_getattr_np(thread, &attr);
    if (result != 0) {
        return -1; // Error getting attributes
    }

    // Get detach state
    result = pthread_attr_getdetachstate(&attr, &detachstate);
    if (result != 0) {
        pthread_attr_destroy(&attr);
        return -1; // Error getting detach state
    }

    // Clean up
    pthread_attr_destroy(&attr);

    // Return whether thread is joinable
    return (detachstate == PTHREAD_CREATE_JOINABLE);
}