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+/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
+ *
+ * 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 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.
+ */
+
+/* Tests commented out with XXX are ones that are failing on Linux */
+
+/*
+ * Purpose of this test is to check semantics of starting and stopping
+ * prepare, check and idle watchers.
+ *
+ * - A watcher must be able to safely stop or close itself;
+ * - Once a watcher is stopped or closed its callback should never be called.
+ * - If a watcher is closed, it is implicitly stopped and its close_cb should
+ * be called exactly once.
+ * - A watcher can safely start and stop other watchers of the same type.
+ * - Prepare and check watchers are called once per event loop iterations.
+ * - All active idle watchers are queued when the event loop has no more work
+ * to do. This is done repeatedly until all idle watchers are inactive.
+ * - If a watcher starts another watcher of the same type its callback is not
+ * immediately queued. For check and prepare watchers, that means that if
+ * a watcher makes another of the same type active, it'll not be called until
+ * the next event loop iteration. For idle. watchers this means that the
+ * newly activated idle watcher might not be queued immediately.
+ * - Prepare, check, idle watchers keep the event loop alive even when they're
+ * not active.
+ *
+ * This is what the test globally does:
+ *
+ * - prepare_1 is always active and counts event loop iterations. It also
+ * creates and starts prepare_2 every other iteration. Finally it verifies
+ * that no idle watchers are active before polling.
+ * - prepare_2 is started by prepare_1 every other iteration. It immediately
+ * stops itself. It verifies that a watcher is not queued immediately
+ * if created by another watcher of the same type.
+ * - There's a check watcher that stops the event loop after a certain number
+ * of iterations. It starts a varying number of idle_1 watchers.
+ * - Idle_1 watchers stop themselves after being called a few times. All idle_1
+ * watchers try to start the idle_2 watcher if it is not already started or
+ * awaiting its close callback.
+ * - The idle_2 watcher always exists but immediately closes itself after
+ * being started by a check_1 watcher. It verifies that a watcher is
+ * implicitly stopped when closed, and that a watcher can close itself
+ * safely.
+ * - There is a repeating timer. It does not keep the event loop alive
+ * (ev_unref) but makes sure that the loop keeps polling the system for
+ * events.
+ */
+
+
+#include "uv.h"
+#include "task.h"
+
+#include <math.h>
+
+
+#define IDLE_COUNT 7
+#define ITERATIONS 21
+#define TIMEOUT 100
+
+
+static uv_prepare_t prepare_1_handle;
+static uv_prepare_t prepare_2_handle;
+
+static uv_check_t check_handle;
+
+static uv_idle_t idle_1_handles[IDLE_COUNT];
+static uv_idle_t idle_2_handle;
+
+static uv_timer_t timer_handle;
+
+
+static int loop_iteration = 0;
+
+static int prepare_1_cb_called = 0;
+static int prepare_1_close_cb_called = 0;
+
+static int prepare_2_cb_called = 0;
+static int prepare_2_close_cb_called = 0;
+
+static int check_cb_called = 0;
+static int check_close_cb_called = 0;
+
+static int idle_1_cb_called = 0;
+static int idle_1_close_cb_called = 0;
+static int idles_1_active = 0;
+
+static int idle_2_cb_called = 0;
+static int idle_2_close_cb_called = 0;
+static int idle_2_cb_started = 0;
+static int idle_2_is_active = 0;
+
+
+static void timer_cb(uv_timer_t* handle) {
+ ASSERT(handle == &timer_handle);
+}
+
+
+static void idle_2_close_cb(uv_handle_t* handle) {
+ fprintf(stderr, "%s", "IDLE_2_CLOSE_CB\n");
+ fflush(stderr);
+
+ ASSERT(handle == (uv_handle_t*)&idle_2_handle);
+
+ ASSERT(idle_2_is_active);
+
+ idle_2_close_cb_called++;
+ idle_2_is_active = 0;
+}
+
+
+static void idle_2_cb(uv_idle_t* handle) {
+ fprintf(stderr, "%s", "IDLE_2_CB\n");
+ fflush(stderr);
+
+ ASSERT(handle == &idle_2_handle);
+
+ idle_2_cb_called++;
+
+ uv_close((uv_handle_t*)handle, idle_2_close_cb);
+}
+
+
+static void idle_1_cb(uv_idle_t* handle) {
+ int r;
+
+ fprintf(stderr, "%s", "IDLE_1_CB\n");
+ fflush(stderr);
+
+ ASSERT(handle != NULL);
+ ASSERT(idles_1_active > 0);
+
+ /* Init idle_2 and make it active */
+ if (!idle_2_is_active && !uv_is_closing((uv_handle_t*)&idle_2_handle)) {
+ r = uv_idle_init(uv_default_loop(), &idle_2_handle);
+ ASSERT(r == 0);
+ r = uv_idle_start(&idle_2_handle, idle_2_cb);
+ ASSERT(r == 0);
+ idle_2_is_active = 1;
+ idle_2_cb_started++;
+ }
+
+ idle_1_cb_called++;
+
+ if (idle_1_cb_called % 5 == 0) {
+ r = uv_idle_stop((uv_idle_t*)handle);
+ ASSERT(r == 0);
+ idles_1_active--;
+ }
+}
+
+
+static void idle_1_close_cb(uv_handle_t* handle) {
+ fprintf(stderr, "%s", "IDLE_1_CLOSE_CB\n");
+ fflush(stderr);
+
+ ASSERT(handle != NULL);
+
+ idle_1_close_cb_called++;
+}
+
+
+static void prepare_1_close_cb(uv_handle_t* handle) {
+ fprintf(stderr, "%s", "PREPARE_1_CLOSE_CB");
+ fflush(stderr);
+ ASSERT(handle == (uv_handle_t*)&prepare_1_handle);
+
+ prepare_1_close_cb_called++;
+}
+
+
+static void check_close_cb(uv_handle_t* handle) {
+ fprintf(stderr, "%s", "CHECK_CLOSE_CB\n");
+ fflush(stderr);
+ ASSERT(handle == (uv_handle_t*)&check_handle);
+
+ check_close_cb_called++;
+}
+
+
+static void prepare_2_close_cb(uv_handle_t* handle) {
+ fprintf(stderr, "%s", "PREPARE_2_CLOSE_CB\n");
+ fflush(stderr);
+ ASSERT(handle == (uv_handle_t*)&prepare_2_handle);
+
+ prepare_2_close_cb_called++;
+}
+
+
+static void check_cb(uv_check_t* handle) {
+ int i, r;
+
+ fprintf(stderr, "%s", "CHECK_CB\n");
+ fflush(stderr);
+ ASSERT(handle == &check_handle);
+
+ if (loop_iteration < ITERATIONS) {
+ /* Make some idle watchers active */
+ for (i = 0; i < 1 + (loop_iteration % IDLE_COUNT); i++) {
+ r = uv_idle_start(&idle_1_handles[i], idle_1_cb);
+ ASSERT(r == 0);
+ idles_1_active++;
+ }
+
+ } else {
+ /* End of the test - close all handles */
+ uv_close((uv_handle_t*)&prepare_1_handle, prepare_1_close_cb);
+ uv_close((uv_handle_t*)&check_handle, check_close_cb);
+ uv_close((uv_handle_t*)&prepare_2_handle, prepare_2_close_cb);
+
+ for (i = 0; i < IDLE_COUNT; i++) {
+ uv_close((uv_handle_t*)&idle_1_handles[i], idle_1_close_cb);
+ }
+
+ /* This handle is closed/recreated every time, close it only if it is */
+ /* active.*/
+ if (idle_2_is_active) {
+ uv_close((uv_handle_t*)&idle_2_handle, idle_2_close_cb);
+ }
+ }
+
+ check_cb_called++;
+}
+
+
+static void prepare_2_cb(uv_prepare_t* handle) {
+ int r;
+
+ fprintf(stderr, "%s", "PREPARE_2_CB\n");
+ fflush(stderr);
+ ASSERT(handle == &prepare_2_handle);
+
+ /* prepare_2 gets started by prepare_1 when (loop_iteration % 2 == 0), */
+ /* and it stops itself immediately. A started watcher is not queued */
+ /* until the next round, so when this callback is made */
+ /* (loop_iteration % 2 == 0) cannot be true. */
+ ASSERT(loop_iteration % 2 != 0);
+
+ r = uv_prepare_stop((uv_prepare_t*)handle);
+ ASSERT(r == 0);
+
+ prepare_2_cb_called++;
+}
+
+
+static void prepare_1_cb(uv_prepare_t* handle) {
+ int r;
+
+ fprintf(stderr, "%s", "PREPARE_1_CB\n");
+ fflush(stderr);
+ ASSERT(handle == &prepare_1_handle);
+
+ if (loop_iteration % 2 == 0) {
+ r = uv_prepare_start(&prepare_2_handle, prepare_2_cb);
+ ASSERT(r == 0);
+ }
+
+ prepare_1_cb_called++;
+ loop_iteration++;
+
+ printf("Loop iteration %d of %d.\n", loop_iteration, ITERATIONS);
+}
+
+
+TEST_IMPL(loop_handles) {
+ int i;
+ int r;
+
+ r = uv_prepare_init(uv_default_loop(), &prepare_1_handle);
+ ASSERT(r == 0);
+ r = uv_prepare_start(&prepare_1_handle, prepare_1_cb);
+ ASSERT(r == 0);
+
+ r = uv_check_init(uv_default_loop(), &check_handle);
+ ASSERT(r == 0);
+ r = uv_check_start(&check_handle, check_cb);
+ ASSERT(r == 0);
+
+ /* initialize only, prepare_2 is started by prepare_1_cb */
+ r = uv_prepare_init(uv_default_loop(), &prepare_2_handle);
+ ASSERT(r == 0);
+
+ for (i = 0; i < IDLE_COUNT; i++) {
+ /* initialize only, idle_1 handles are started by check_cb */
+ r = uv_idle_init(uv_default_loop(), &idle_1_handles[i]);
+ ASSERT(r == 0);
+ }
+
+ /* don't init or start idle_2, both is done by idle_1_cb */
+
+ /* the timer callback is there to keep the event loop polling */
+ /* unref it as it is not supposed to keep the loop alive */
+ r = uv_timer_init(uv_default_loop(), &timer_handle);
+ ASSERT(r == 0);
+ r = uv_timer_start(&timer_handle, timer_cb, TIMEOUT, TIMEOUT);
+ ASSERT(r == 0);
+ uv_unref((uv_handle_t*)&timer_handle);
+
+ r = uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+ ASSERT(r == 0);
+
+ ASSERT(loop_iteration == ITERATIONS);
+
+ ASSERT(prepare_1_cb_called == ITERATIONS);
+ ASSERT(prepare_1_close_cb_called == 1);
+
+ ASSERT(prepare_2_cb_called == floor(ITERATIONS / 2.0));
+ ASSERT(prepare_2_close_cb_called == 1);
+
+ ASSERT(check_cb_called == ITERATIONS);
+ ASSERT(check_close_cb_called == 1);
+
+ /* idle_1_cb should be called a lot */
+ ASSERT(idle_1_close_cb_called == IDLE_COUNT);
+
+ ASSERT(idle_2_close_cb_called == idle_2_cb_started);
+ ASSERT(idle_2_is_active == 0);
+
+ MAKE_VALGRIND_HAPPY();
+ return 0;
+}