test/testerror.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 07 Jul 2019 09:10:56 -0700
changeset 12928 3c4a4b1077cd
parent 12503 806492103856
permissions -rw-r--r--
Fixed bug 4710 - audio/alsa: avoid configuring hardware parameters with only a single period

Anthony Pesch

The previous code first configured the period size using snd_pcm_hw_par-
ams_set_period_size_near. Then, it further narrowed the configuration
space by calling snd_pcm_hw_params_set_buffer_size_near using a buffer
size of 2 times the _requested_ period size in order to try and get a
configuration with only 2 periods. If the configured period size was
larger than the requested size, the second call could inadvertently
narrow the configuration space to contain only a single period.

Rather than fixing the call to snd_pcm_hw_params_set_buffer_size_near
to use a size of 2 times the configured period size, the code has been
changed to use snd_pcm_hw_params_set_periods_min in order to more
clearly explain the intent.
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/*
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  Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely.
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*/
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/* Simple test of the SDL threading code and error handling */
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#include <stdio.h>
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#include <stdlib.h>
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#include "SDL.h"
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static int alive = 0;
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/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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static void
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quit(int rc)
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{
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    SDL_Quit();
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    exit(rc);
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}
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int SDLCALL
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ThreadFunc(void *data)
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{
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    /* Set the child thread error string */
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    SDL_SetError("Thread %s (%lu) had a problem: %s",
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                 (char *) data, SDL_ThreadID(), "nevermind");
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    while (alive) {
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        SDL_Log("Thread '%s' is alive!\n", (char *) data);
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        SDL_Delay(1 * 1000);
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    }
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    SDL_Log("Child thread error string: %s\n", SDL_GetError());
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    return (0);
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}
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int
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main(int argc, char *argv[])
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{
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    SDL_Thread *thread;
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    /* Enable standard application logging */
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    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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    /* Load the SDL library */
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    if (SDL_Init(0) < 0) {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
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        return (1);
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    }
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    /* Set the error value for the main thread */
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    SDL_SetError("No worries");
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    alive = 1;
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    thread = SDL_CreateThread(ThreadFunc, NULL, "#1");
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    if (thread == NULL) {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create thread: %s\n", SDL_GetError());
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        quit(1);
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    }
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    SDL_Delay(5 * 1000);
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    SDL_Log("Waiting for thread #1\n");
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    alive = 0;
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    SDL_WaitThread(thread, NULL);
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    SDL_Log("Main thread error string: %s\n", SDL_GetError());
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    SDL_Quit();
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    return (0);
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}