[v6,4/5] coroutine: add test-coroutine automated tests

diff --git a/.gitignore b/.gitignore
index 08013fc..3ad334a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,6 +34,7 @@  qemu-img-cmds.h
 qemu-io
 qemu-monitor.texi
 QMP/qmp-commands.txt
+test-coroutine
 .gdbinit
 *.a
 *.aux
diff --git a/Makefile b/Makefile
index 42ae4e5..98986ad 100644
--- a/Makefile
+++ b/Makefile
@@ -151,7 +151,7 @@  qemu-io$(EXESUF): qemu-io.o cmd.o qemu-tool.o qemu-error.o $(oslib-obj-y) $(trac
 qemu-img-cmds.h: $(SRC_PATH)/qemu-img-cmds.hx
 	$(call quiet-command,sh $(SRC_PATH)/scripts/hxtool -h < $< > $@,"  GEN   $@")
 
-check-qint.o check-qstring.o check-qdict.o check-qlist.o check-qfloat.o check-qjson.o: $(GENERATED_HEADERS)
+check-qint.o check-qstring.o check-qdict.o check-qlist.o check-qfloat.o check-qjson.o test-coroutine.o: $(GENERATED_HEADERS)
 
 CHECK_PROG_DEPS = qemu-malloc.o $(oslib-obj-y) $(trace-obj-y) qemu-tool.o
 
@@ -161,6 +161,7 @@  check-qdict: check-qdict.o qdict.o qfloat.o qint.o qstring.o qbool.o qlist.o $(C
 check-qlist: check-qlist.o qlist.o qint.o $(CHECK_PROG_DEPS)
 check-qfloat: check-qfloat.o qfloat.o $(CHECK_PROG_DEPS)
 check-qjson: check-qjson.o qfloat.o qint.o qdict.o qstring.o qlist.o qbool.o qjson.o json-streamer.o json-lexer.o json-parser.o error.o qerror.o qemu-error.o $(CHECK_PROG_DEPS)
+test-coroutine: test-coroutine.o $(coroutine-obj-y) $(CHECK_PROG_DEPS)
 
 QEMULIBS=libhw32 libhw64 libuser libdis libdis-user
 
diff --git a/test-coroutine.c b/test-coroutine.c
new file mode 100644
index 0000000..9e9d3c9
--- /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();
+}