1 files changed, 90 insertions, 0 deletions
diff --git a/libcr_ipc/tests/test_select.c b/libcr_ipc/tests/test_select.c
new file mode 100644
index 0000000..f0a71a3
--- /dev/null
+++ b/libcr_ipc/tests/test_select.c
@@ -0,0 +1,90 @@
+/* libcr_ipc/tests/test_select.c - Tests for <libcr_ipc/select.h>
+ *
+ * Copyright (C) 2024-2025  Luke T. Shumaker <lukeshu@lukeshu.com>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+#include <libcr/coroutine.h>
+#include <libcr_ipc/chan.h>
+
+#include "test.h"
+
+CR_CHAN_DECLARE(intchan, int);
+
+intchan_t ch[10] = {0};
+intchan_t fch = {0};
+
+COROUTINE cr_consumer(void *) {
+	cr_begin();
+
+	struct cr_select_arg args[11];
+
+	bool chdone[10] = {0};
+	int arg2ch[10];
+	for (;;) {
+		int ret_ch;
+		int i_arg = 0;
+		for (int i_ch = 0; i_ch < 10; i_ch++) {
+			if (!chdone[i_ch]) {
+				args[i_arg] = CR_SELECT_RECV(&ch[i_ch], &ret_ch);
+				arg2ch[i_arg] = i_ch;
+				i_arg++;
+			}
+		}
+		if (!i_arg)
+			break;
+		args[i_arg] = CR_SELECT_DEFAULT; /* check that default doesn't trigger */
+		test_assert(i_arg <= 10);
+		int ret_arg = cr_select_v(i_arg+1, args);
+		test_assert(ret_arg < i_arg);
+		test_assert(arg2ch[ret_arg] == ret_ch);
+		chdone[ret_ch] = true;
+	}
+	int ret_ch, ret_arg;
+	args[0] = CR_SELECT_RECV(&ch[0], &ret_ch);
+	args[1] = CR_SELECT_DEFAULT;
+	ret_arg = cr_select_v(2, args);
+	test_assert(ret_arg == 1);
+
+	int send = 567;
+	args[0] = CR_SELECT_SEND(&fch, &send);
+	args[1] = CR_SELECT_DEFAULT;
+	ret_arg = cr_select_v(2, args);
+	test_assert(ret_arg == 0);
+
+	send = 890;
+	args[0] = CR_SELECT_SEND(&fch, &send);
+	args[1] = CR_SELECT_DEFAULT;
+	ret_arg = cr_select_v(2, args);
+	test_assert(ret_arg == 1);
+
+	cr_end();
+}
+
+COROUTINE cr_producer(void *_n) {
+	int n = *(int *)_n;
+	cr_begin();
+
+	cr_chan_send(&ch[n], n);
+
+	cr_end();
+}
+
+COROUTINE cr_final(void *) {
+	cr_begin();
+
+	int ret = cr_chan_recv(&fch);
+	printf("ret=%d\n", ret);
+	test_assert(ret == 567);
+
+	cr_end();
+}
+
+int main() {
+	for (int i = 0; i < 10; i++)
+		coroutine_add("producer", cr_producer, &i);
+	coroutine_add("consumer", cr_consumer, NULL);
+	coroutine_add("final", cr_final, NULL);
+	coroutine_main();
+	return 0;
+}