evq_t evq_create(int nevents);
void evq_destroy(evq_t evq);
int evq_add_read(evq_t evq, int fd, void *data);
int evq_add_write(evq_t evq, int fd, void *data);
int evq_set_read(evq_t evq, int fd, void *data);
int evq_set_write(evq_t evq, int fd, void *data);
int evq_del(evq_t evq, int fd, void *data);
int evq_wait(evq_t evq, int msec);
void *evq_next(evq_t evq);The evq_create() call creates an event queue instance and it is used as a
first argument to other calls. The nevents argument determines how much
memory will be allocated internally. Default value is used if zero or negative
value is provided. evq_destroy() should be called to release resources.
The evq_add_read() and evq_add_write() calls register file descriptor fd
for read or write events respectively.
The evq_wait() call will wait for new events at least msec milliseconds.
It returns positive value if one or more events are triggered. The data
asssociated with the event is returned by evq_next() call.