eventfd.h

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/*
 * Copyright (c) 2020 Tobias Svehagen
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_POSIX_SYS_EVENTFD_H_
#define ZEPHYR_INCLUDE_POSIX_SYS_EVENTFD_H_
 
#include <zephyr/kernel.h>
#include <zephyr/sys/fdtable.h>
#include <sys/types.h>
 
#include <zephyr/posix/fcntl.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define EFD_IN_USE    0x1
#define EFD_SEMAPHORE 0x2
#define EFD_NONBLOCK  O_NONBLOCK
#define EFD_FLAGS_SET (EFD_SEMAPHORE | EFD_NONBLOCK)
 
typedef uint64_t eventfd_t;
 
int eventfd(unsigned int initval, int flags);
 
static inline int eventfd_read(int fd, eventfd_t *value)
{
        const struct fd_op_vtable *efd_vtable;
        struct k_mutex *lock;
        ssize_t ret;
        void *obj;
 
        obj = z_get_fd_obj_and_vtable(fd, &efd_vtable, &lock);
 
        (void)k_mutex_lock(lock, K_FOREVER);
 
        ret = efd_vtable->read(obj, value, sizeof(*value));
 
        k_mutex_unlock(lock);
 
        return ret == sizeof(eventfd_t) ? 0 : -1;
}
 
static inline int eventfd_write(int fd, eventfd_t value)
{
        const struct fd_op_vtable *efd_vtable;
        struct k_mutex *lock;
        ssize_t ret;
        void *obj;
 
        obj = z_get_fd_obj_and_vtable(fd, &efd_vtable, &lock);
 
        (void)k_mutex_lock(lock, K_FOREVER);
 
        ret = efd_vtable->write(obj, &value, sizeof(value));
 
        k_mutex_unlock(lock);
 
        return ret == sizeof(eventfd_t) ? 0 : -1;
}
 
#ifdef __cplusplus
}
#endif
 
#endif /* ZEPHYR_INCLUDE_POSIX_SYS_EVENTFD_H_ */