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https://gitee.com/openharmony/third_party_alsa-utils
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63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// waiter.h - a header for I/O event waiter.
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//
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// Copyright (c) 2018 Takashi Sakamoto <o-takashi@sakamocchi.jp>
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//
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// Licensed under the terms of the GNU General Public License, version 2.
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#ifndef __ALSA_UTILS_AXFER_WAITER__H_
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#define __ALSA_UTILS_AXFER_WAITER__H_
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#include <alsa/global.h>
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#include <poll.h>
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enum waiter_type {
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WAITER_TYPE_DEFAULT = 0,
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WAITER_TYPE_POLL,
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WAITER_TYPE_SELECT,
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WAITER_TYPE_EPOLL,
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WAITER_TYPE_COUNT,
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};
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struct waiter_ops;
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struct waiter_context {
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enum waiter_type type;
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const struct waiter_ops *ops;
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void *private_data;
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struct pollfd *pfds;
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unsigned int pfd_count;
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};
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enum waiter_type waiter_type_from_label(const char *label);
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const char *waiter_label_from_type(enum waiter_type type);
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int waiter_context_init(struct waiter_context *waiter,
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enum waiter_type type, unsigned int pfd_count);
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int waiter_context_prepare(struct waiter_context *waiter);
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int waiter_context_wait_event(struct waiter_context *waiter,
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int timeout_msec);
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void waiter_context_release(struct waiter_context *waiter);
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void waiter_context_destroy(struct waiter_context *waiter);
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// For internal use in 'waiter' module.
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struct waiter_ops {
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int (*prepare)(struct waiter_context *waiter);
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int (*wait_event)(struct waiter_context *waiter, int timeout_msec);
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void (*release)(struct waiter_context *waiter);
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};
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struct waiter_data {
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struct waiter_ops ops;
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unsigned int private_size;
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};
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extern const struct waiter_data waiter_poll;
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extern const struct waiter_data waiter_select;
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extern const struct waiter_data waiter_epoll;
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#endif
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