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annotate DPF-Prymula-audioplugins/dpf/distrho/src/clap/ext/thread-check.h @ 3:84e66ea83026

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DPF-Prymula-audioplugins-0.231015-2
author prymula <prymula76@outlook.com>
date Mon, 16 Oct 2023 21:53:34 +0200
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1 #pragma once
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2
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3 #include "../plugin.h"
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5 static CLAP_CONSTEXPR const char CLAP_EXT_THREAD_CHECK[] = "clap.thread-check";
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6
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7 #ifdef __cplusplus
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8 extern "C" {
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9 #endif
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11 /// @page thread-check
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12 ///
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13 /// CLAP defines two symbolic threads:
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14 ///
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15 /// main-thread:
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16 /// This is the thread in which most of the interaction between the plugin and host happens.
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17 /// It is usually the thread on which the GUI receives its events.
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18 /// It isn't a realtime thread, yet this thread needs to respond fast enough to user interaction,
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19 /// so it is recommended to run long and expensive tasks such as preset indexing or asset loading
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20 /// in dedicated background threads.
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21 ///
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22 /// audio-thread:
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23 /// This thread is used for realtime audio processing. Its execution should be as deterministic
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24 /// as possible to meet the audio interface's deadline (can be <1ms). In other words, there is a
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25 /// known set of operations that should be avoided: malloc() and free(), mutexes (spin mutexes
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26 /// are worse), I/O, waiting, ...
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27 /// The audio-thread is something symbolic, there isn't one OS thread that remains the
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28 /// audio-thread for the plugin lifetime. As you may guess, the host is likely to have a
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29 /// thread pool and the plugin.process() call may be scheduled on different OS threads over time.
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30 /// The most important thing is that there can't be two audio-threads at the same time. All the
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31 /// functions marked with [audio-thread] **ARE NOT CONCURRENT**. The host may mark any OS thread,
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32 /// including the main-thread as the audio-thread, as long as it can guarentee that only one OS
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33 /// thread is the audio-thread at a time. The audio-thread can be seen as a concurrency guard for
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34 /// all functions marked with [audio-thread].
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35
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36 // This interface is useful to do runtime checks and make
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37 // sure that the functions are called on the correct threads.
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38 // It is highly recommended that hosts implement this extension.
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39 typedef struct clap_host_thread_check {
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40 // Returns true if "this" thread is the main thread.
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41 // [thread-safe]
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42 bool(CLAP_ABI *is_main_thread)(const clap_host_t *host);
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43
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44 // Returns true if "this" thread is one of the audio threads.
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45 // [thread-safe]
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46 bool(CLAP_ABI *is_audio_thread)(const clap_host_t *host);
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47 } clap_host_thread_check_t;
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48
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49 #ifdef __cplusplus
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50 }
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51 #endif