coroutine: add test-coroutine automated tests

To run automated tests for coroutines:

  make test-coroutine
  ./test-coroutine

On success the program terminates with exit status 0.  On failure an
error message is written to stderr and the program exits with exit
status 1.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

1 files changed, 162 insertions, 0 deletions

diff --git a/test-coroutine.c b/test-coroutine.c
new file mode 100644
index 0000000000..9e9d3c95bc
--- /dev/null
+++ b/test-coroutine.c
@@ -0,0 +1,162 @@
+/*
+ * Coroutine tests
+ *
+ * Copyright IBM, Corp. 2011
+ *
+ * Authors:
+ *  Stefan Hajnoczi    <stefanha@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#include <glib.h>
+#include "qemu-coroutine.h"
+
+/*
+ * Check that qemu_in_coroutine() works
+ */
+
+static void coroutine_fn verify_in_coroutine(void *opaque)
+{
+    g_assert(qemu_in_coroutine());
+}
+
+static void test_in_coroutine(void)
+{
+    Coroutine *coroutine;
+
+    g_assert(!qemu_in_coroutine());
+
+    coroutine = qemu_coroutine_create(verify_in_coroutine);
+    qemu_coroutine_enter(coroutine, NULL);
+}
+
+/*
+ * Check that qemu_coroutine_self() works
+ */
+
+static void coroutine_fn verify_self(void *opaque)
+{
+    g_assert(qemu_coroutine_self() == opaque);
+}
+
+static void test_self(void)
+{
+    Coroutine *coroutine;
+
+    coroutine = qemu_coroutine_create(verify_self);
+    qemu_coroutine_enter(coroutine, coroutine);
+}
+
+/*
+ * Check that coroutines may nest multiple levels
+ */
+
+typedef struct {
+    unsigned int n_enter;   /* num coroutines entered */
+    unsigned int n_return;  /* num coroutines returned */
+    unsigned int max;       /* maximum level of nesting */
+} NestData;
+
+static void coroutine_fn nest(void *opaque)
+{
+    NestData *nd = opaque;
+
+    nd->n_enter++;
+
+    if (nd->n_enter < nd->max) {
+        Coroutine *child;
+
+        child = qemu_coroutine_create(nest);
+        qemu_coroutine_enter(child, nd);
+    }
+
+    nd->n_return++;
+}
+
+static void test_nesting(void)
+{
+    Coroutine *root;
+    NestData nd = {
+        .n_enter  = 0,
+        .n_return = 0,
+        .max      = 128,
+    };
+
+    root = qemu_coroutine_create(nest);
+    qemu_coroutine_enter(root, &nd);
+
+    /* Must enter and return from max nesting level */
+    g_assert_cmpint(nd.n_enter, ==, nd.max);
+    g_assert_cmpint(nd.n_return, ==, nd.max);
+}
+
+/*
+ * Check that yield/enter transfer control correctly
+ */
+
+static void coroutine_fn yield_5_times(void *opaque)
+{
+    bool *done = opaque;
+    int i;
+
+    for (i = 0; i < 5; i++) {
+        qemu_coroutine_yield();
+    }
+    *done = true;
+}
+
+static void test_yield(void)
+{
+    Coroutine *coroutine;
+    bool done = false;
+    int i = -1; /* one extra time to return from coroutine */
+
+    coroutine = qemu_coroutine_create(yield_5_times);
+    while (!done) {
+        qemu_coroutine_enter(coroutine, &done);
+        i++;
+    }
+    g_assert_cmpint(i, ==, 5); /* coroutine must yield 5 times */
+}
+
+/*
+ * Check that creation, enter, and return work
+ */
+
+static void coroutine_fn set_and_exit(void *opaque)
+{
+    bool *done = opaque;
+
+    *done = true;
+}
+
+static void test_lifecycle(void)
+{
+    Coroutine *coroutine;
+    bool done = false;
+
+    /* Create, enter, and return from coroutine */
+    coroutine = qemu_coroutine_create(set_and_exit);
+    qemu_coroutine_enter(coroutine, &done);
+    g_assert(done); /* expect done to be true (first time) */
+
+    /* Repeat to check that no state affects this test */
+    done = false;
+    coroutine = qemu_coroutine_create(set_and_exit);
+    qemu_coroutine_enter(coroutine, &done);
+    g_assert(done); /* expect done to be true (second time) */
+}
+
+int main(int argc, char **argv)
+{
+    g_test_init(&argc, &argv, NULL);
+    g_test_add_func("/basic/lifecycle", test_lifecycle);
+    g_test_add_func("/basic/yield", test_yield);
+    g_test_add_func("/basic/nesting", test_nesting);
+    g_test_add_func("/basic/self", test_self);
+    g_test_add_func("/basic/in_coroutine", test_in_coroutine);
+    return g_test_run();
+}