tests: Add pipewire-alsa stress test

Add test that opens, prepares and closes the alsa pcm device in several
threads simultaneously in an infinite loop.

meson.build

@@ -467,6 +467,7 @@ endif
 if alsa_dep.found()
   subdir('pipewire-alsa/alsa-plugins')
   subdir('pipewire-alsa/conf')
+  subdir('pipewire-alsa/tests')
 endif
 
 doxygen = find_program('doxygen', required : get_option('docs'))

pipewire-alsa/tests/meson.build

@@ -0,0 +1,23 @@
+test_apps = [
+  [ 'test-pipewire-alsa-stress', [alsa_dep, pthread_lib] ],
+]
+
+foreach a : test_apps
+  executable('pw-' + a[0], a[0] + '.c',
+    dependencies : a[1],
+    include_directories: [includes_inc],
+    install : installed_tests_enabled,
+    install_dir : installed_tests_execdir
+  )
+
+  if installed_tests_enabled
+    test_conf = configuration_data()
+    test_conf.set('exec', installed_tests_execdir / 'pw-' + a[0])
+    configure_file(
+      input: installed_tests_template,
+      output: 'pw-' + a[0] + '.test',
+      install_dir: installed_tests_metadir,
+      configuration: test_conf
+    )
+  endif
+endforeach

pipewire-alsa/tests/test-pipewire-alsa-stress.c

@@ -0,0 +1,151 @@
+/* PipeWire
+ *
+ * Copyright © 2021 Axis Communications AB
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ [title]
+ Stress test using pipewire-alsa.
+ [title]
+ */
+
+#include <alsa/asoundlib.h>
+#include <pthread.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+#define DEFAULT_PCM		"pipewire"
+#define DEFAULT_RATE		44100
+#define DEFAULT_CHANNELS	2
+#define N_THREADS		20
+
+static void *
+thread_func(void *data)
+{
+	snd_pcm_t *pcm = NULL;
+	snd_pcm_hw_params_t *params;
+	int res;
+	long n = (long)data;
+	unsigned int sample_rate = DEFAULT_RATE;
+
+	res = snd_pcm_open(&pcm, DEFAULT_PCM, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK);
+	if (res < 0) {
+		fprintf(stderr, "open failed: %s\n", snd_strerror(res));
+		pcm = NULL;
+		goto fail;
+	}
+	printf("opened %ld\n", n);
+
+	snd_pcm_hw_params_alloca(&params);
+	res = snd_pcm_hw_params_any(pcm, params);
+	if (res < 0) {
+		fprintf(stderr, "params_any failed: %s\n", snd_strerror(res));
+		goto fail;
+	}
+
+	res = snd_pcm_hw_params_set_access(pcm, params, SND_PCM_ACCESS_RW_INTERLEAVED);
+	if (res < 0) {
+		fprintf(stderr, "set_access failed: %s\n", snd_strerror(res));
+		goto fail;
+	}
+
+	res = snd_pcm_hw_params_set_format(pcm, params, SND_PCM_FORMAT_S32_LE);
+	if (res < 0) {
+		fprintf(stderr, "set_format failed: %s\n", snd_strerror(res));
+		goto fail;
+	}
+
+	res = snd_pcm_hw_params_set_rate_near(pcm, params, &sample_rate, 0);
+	if (res < 0) {
+		fprintf(stderr, "set_rate_near failed: %s\n", snd_strerror(res));
+		goto fail;
+	}
+
+	res = snd_pcm_hw_params_set_channels(pcm, params, DEFAULT_CHANNELS);
+	if (res < 0) {
+		fprintf(stderr, "set_channels failed: %s\n", snd_strerror(res));
+		goto fail;
+	}
+
+	res = snd_pcm_hw_params(pcm, params);
+	if (res < 0) {
+		fprintf(stderr, "params failed: %s\n", snd_strerror(res));
+		goto fail;
+	}
+
+	res = snd_pcm_prepare(pcm);
+	if (res < 0) {
+		fprintf(stderr, "prepare failed: %s (%d)\n", snd_strerror(res), res);
+		goto fail;
+	}
+	printf("prepared %ld\n", n);
+
+	res = snd_pcm_close(pcm);
+	if (res < 0) {
+		fprintf(stderr, "close failed: %s\n", snd_strerror(res));
+		pcm = NULL;
+		goto fail;
+	}
+	printf("closed %ld\n", n);
+
+	return NULL;
+
+fail:
+	if (pcm != NULL) {
+		res = snd_pcm_close(pcm);
+		if (res < 0) {
+			fprintf(stderr, "close failed: %s\n", snd_strerror(res));
+		}
+	}
+	exit(EXIT_FAILURE);
+}
+
+int
+main(int argc, char *argv[])
+{
+	pthread_t t[N_THREADS] = { 0 };
+	long n;
+	int s;
+
+	/* avoid rtkit in this test */
+	setenv("PIPEWIRE_CONFIG_NAME", "client.conf", false);
+
+	while (true) {
+		for (n=0; n < N_THREADS; n++) {
+			if ((s = pthread_create(&(t[n]), NULL, thread_func, (void *)n)) != 0) {
+				fprintf(stderr, "pthread_create: %s\n", strerror(s));
+				exit(EXIT_FAILURE);
+			}
+			printf("created %ld\n", n);
+		}
+		for (n=0; n < N_THREADS; n++) {
+			if (t[n] != 0 && (s = pthread_join(t[n], NULL)) != 0) {
+				fprintf(stderr, "pthread_join: %s\n", strerror(s));
+				exit(EXIT_FAILURE);
+			}
+			printf("joined %ld\n", n);
+			t[n] = 0;
+		}
+	}
+
+	return EXIT_SUCCESS;
+}