| /* |
| * 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 "block/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) */ |
| } |
| |
| /* |
| * Lifecycle benchmark |
| */ |
| |
| static void coroutine_fn empty_coroutine(void *opaque) |
| { |
| /* Do nothing */ |
| } |
| |
| static void perf_lifecycle(void) |
| { |
| Coroutine *coroutine; |
| unsigned int i, max; |
| double duration; |
| |
| max = 1000000; |
| |
| g_test_timer_start(); |
| for (i = 0; i < max; i++) { |
| coroutine = qemu_coroutine_create(empty_coroutine); |
| qemu_coroutine_enter(coroutine, NULL); |
| } |
| duration = g_test_timer_elapsed(); |
| |
| g_test_message("Lifecycle %u iterations: %f s\n", max, duration); |
| } |
| |
| static void perf_nesting(void) |
| { |
| unsigned int i, maxcycles, maxnesting; |
| double duration; |
| |
| maxcycles = 100000000; |
| maxnesting = 20000; |
| Coroutine *root; |
| NestData nd = { |
| .n_enter = 0, |
| .n_return = 0, |
| .max = maxnesting, |
| }; |
| |
| g_test_timer_start(); |
| for (i = 0; i < maxcycles; i++) { |
| root = qemu_coroutine_create(nest); |
| qemu_coroutine_enter(root, &nd); |
| } |
| duration = g_test_timer_elapsed(); |
| |
| g_test_message("Nesting %u iterations of %u depth each: %f s\n", |
| maxcycles, maxnesting, duration); |
| } |
| |
| |
| 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); |
| if (g_test_perf()) { |
| g_test_add_func("/perf/lifecycle", perf_lifecycle); |
| g_test_add_func("/perf/nesting", perf_nesting); |
| } |
| return g_test_run(); |
| } |