mirror of
https://github.com/alsa-project/alsa-utils
synced 2024-11-10 03:45:42 +01:00
fce16d9279
This commit adds support of waiter for select(2) system call. Below lines are examples to use this option: $ axfer transfer --waiter-type=select -M -P -d 2 -D hw:0,3 /dev/urandom -f dat -vvv $ axfer transfer --waiter-type=select -M -C -d 2 -D hw:1,0 /dev/null -r 48000 -vvv Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
//
|
|
// waiter.h - a header for I/O event waiter.
|
|
//
|
|
// Copyright (c) 2018 Takashi Sakamoto <o-takashi@sakamocchi.jp>
|
|
//
|
|
// Licensed under the terms of the GNU General Public License, version 2.
|
|
|
|
#ifndef __ALSA_UTILS_AXFER_WAITER__H_
|
|
#define __ALSA_UTILS_AXFER_WAITER__H_
|
|
|
|
#include <poll.h>
|
|
|
|
enum waiter_type {
|
|
WAITER_TYPE_DEFAULT = 0,
|
|
WAITER_TYPE_POLL,
|
|
WAITER_TYPE_SELECT,
|
|
WAITER_TYPE_COUNT,
|
|
};
|
|
|
|
struct waiter_ops;
|
|
|
|
struct waiter_context {
|
|
enum waiter_type type;
|
|
const struct waiter_ops *ops;
|
|
void *private_data;
|
|
|
|
struct pollfd *pfds;
|
|
unsigned int pfd_count;
|
|
};
|
|
|
|
enum waiter_type waiter_type_from_label(const char *label);
|
|
const char *waiter_label_from_type(enum waiter_type type);
|
|
|
|
int waiter_context_init(struct waiter_context *waiter,
|
|
enum waiter_type type, unsigned int pfd_count);
|
|
int waiter_context_prepare(struct waiter_context *waiter);
|
|
int waiter_context_wait_event(struct waiter_context *waiter,
|
|
int timeout_msec);
|
|
void waiter_context_release(struct waiter_context *waiter);
|
|
void waiter_context_destroy(struct waiter_context *waiter);
|
|
|
|
// For internal use in 'waiter' module.
|
|
|
|
struct waiter_ops {
|
|
int (*prepare)(struct waiter_context *waiter);
|
|
int (*wait_event)(struct waiter_context *waiter, int timeout_msec);
|
|
void (*release)(struct waiter_context *waiter);
|
|
};
|
|
|
|
struct waiter_data {
|
|
struct waiter_ops ops;
|
|
unsigned int private_size;
|
|
};
|
|
|
|
extern const struct waiter_data waiter_poll;
|
|
extern const struct waiter_data waiter_select;
|
|
|
|
#endif
|