cond_dynamic.c

/*
 * cond_dynamic.c
 *
 * Demonstrate dynamic initialization of a condition variable.
 */
#include <pthread.h>
#include "errors.h"

/*
 * Define a structure, with a mutex and condition variable.
 */
typedef struct my_struct_tag {
    pthread_mutex_t     mutex;  /* Protects access to value */
    pthread_cond_t      cond;   /* Signals change to value */
    int                 value;  /* Access protected by mutex */
} my_struct_t;

int main (int argc, char *argv[])
{
    my_struct_t *data;
    int status;

    data = malloc (sizeof (my_struct_t));
    if (data == NULL)
        errno_abort ("Allocate structure");
    status = pthread_mutex_init (&data->mutex, NULL);
    if (status != 0)
        err_abort (status, "Init mutex");
    status = pthread_cond_init (&data->cond, NULL);
    if (status != 0)
        err_abort (status, "Init condition");
    status = pthread_cond_destroy (&data->cond);
    if (status != 0)
        err_abort (status, "Destroy condition");
    status = pthread_mutex_destroy (&data->mutex);
    if (status != 0)
        err_abort (status, "Destroy mutex");
    (void)free (data);
    return status;
}