test/core/surface/completion_queue_test.c - platform/external/grpc-grpc - Gitiles

 /*
  *
  * Copyright 2015, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */

 #include "src/core/lib/surface/completion_queue.h"

 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 #include <grpc/support/time.h>
 #include <grpc/support/useful.h>
 #include "src/core/lib/iomgr/iomgr.h"
 #include "test/core/util/test_config.h"

 #define LOG_TEST(x) gpr_log(GPR_INFO, "%s", x)

 static void *create_test_tag(void) {
   static intptr_t i = 0;
   return (void *)(++i);
 }

 /* helper for tests to shutdown correctly and tersely */
 static void shutdown_and_destroy(grpc_completion_queue *cc) {
   grpc_event ev;
   grpc_completion_queue_shutdown(cc);

   switch (grpc_get_cq_completion_type(cc)) {
     case GRPC_CQ_NEXT: {
       ev = grpc_completion_queue_next(cc, gpr_inf_past(GPR_CLOCK_REALTIME),
                                       NULL);
       break;
     }
     case GRPC_CQ_PLUCK: {
       ev = grpc_completion_queue_pluck(cc, create_test_tag(),
                                        gpr_inf_past(GPR_CLOCK_REALTIME), NULL);
       break;
     }
     default: {
       gpr_log(GPR_ERROR, "Unknown completion type");
       break;
     }
   }

   GPR_ASSERT(ev.type == GRPC_QUEUE_SHUTDOWN);
   grpc_completion_queue_destroy(cc);
 }

 /* ensure we can create and destroy a completion channel */
 static void test_no_op(void) {
   grpc_cq_completion_type completion_types[] = {GRPC_CQ_NEXT, GRPC_CQ_PLUCK};
   grpc_cq_polling_type polling_types[] = {
       GRPC_CQ_DEFAULT_POLLING, GRPC_CQ_NON_LISTENING, GRPC_CQ_NON_POLLING};
   grpc_completion_queue_attributes attr;
   LOG_TEST("test_no_op");

   attr.version = 1;
   for (size_t i = 0; i < GPR_ARRAY_SIZE(completion_types); i++) {
     for (size_t j = 0; j < GPR_ARRAY_SIZE(polling_types); j++) {
       attr.cq_completion_type = completion_types[i];
       attr.cq_polling_type = polling_types[j];
       shutdown_and_destroy(grpc_completion_queue_create(
           grpc_completion_queue_factory_lookup(&attr), &attr, NULL));
     }
   }
 }

 static void test_pollset_conversion(void) {
   grpc_cq_completion_type completion_types[] = {GRPC_CQ_NEXT, GRPC_CQ_PLUCK};
   grpc_cq_polling_type polling_types[] = {GRPC_CQ_DEFAULT_POLLING,
                                           GRPC_CQ_NON_LISTENING};
   grpc_completion_queue *cq;
   grpc_completion_queue_attributes attr;

   LOG_TEST("test_pollset_conversion");

   attr.version = 1;
   for (size_t i = 0; i < GPR_ARRAY_SIZE(completion_types); i++) {
     for (size_t j = 0; j < GPR_ARRAY_SIZE(polling_types); j++) {
       attr.cq_completion_type = completion_types[i];
       attr.cq_polling_type = polling_types[j];
       cq = grpc_completion_queue_create(
           grpc_completion_queue_factory_lookup(&attr), &attr, NULL);
       GPR_ASSERT(grpc_cq_from_pollset(grpc_cq_pollset(cq)) == cq);
       shutdown_and_destroy(cq);
     }
   }
 }

 static void test_wait_empty(void) {
   grpc_cq_polling_type polling_types[] = {
       GRPC_CQ_DEFAULT_POLLING, GRPC_CQ_NON_LISTENING, GRPC_CQ_NON_POLLING};
   grpc_completion_queue *cc;
   grpc_completion_queue_attributes attr;
   grpc_event event;

   LOG_TEST("test_wait_empty");

   attr.version = 1;
   attr.cq_completion_type = GRPC_CQ_NEXT;
   for (size_t i = 0; i < GPR_ARRAY_SIZE(polling_types); i++) {
     attr.cq_polling_type = polling_types[i];
     cc = grpc_completion_queue_create(
         grpc_completion_queue_factory_lookup(&attr), &attr, NULL);
     event = grpc_completion_queue_next(cc, gpr_now(GPR_CLOCK_REALTIME), NULL);
     GPR_ASSERT(event.type == GRPC_QUEUE_TIMEOUT);
     shutdown_and_destroy(cc);
   }
 }

 static void do_nothing_end_completion(grpc_exec_ctx *exec_ctx, void *arg,
                                       grpc_cq_completion *c) {}

 static void test_cq_end_op(void) {
   grpc_event ev;
   grpc_completion_queue *cc;
   grpc_cq_completion completion;
   grpc_cq_polling_type polling_types[] = {
       GRPC_CQ_DEFAULT_POLLING, GRPC_CQ_NON_LISTENING, GRPC_CQ_NON_POLLING};
   grpc_completion_queue_attributes attr;
   grpc_exec_ctx init_exec_ctx = GRPC_EXEC_CTX_INIT;
   grpc_exec_ctx exec_ctx;
   void *tag = create_test_tag();

   LOG_TEST("test_cq_end_op");

   attr.version = 1;
   attr.cq_completion_type = GRPC_CQ_NEXT;
   for (size_t i = 0; i < GPR_ARRAY_SIZE(polling_types); i++) {
     exec_ctx = init_exec_ctx;  // Reset exec_ctx
     attr.cq_polling_type = polling_types[i];
     cc = grpc_completion_queue_create(
         grpc_completion_queue_factory_lookup(&attr), &attr, NULL);

     grpc_cq_begin_op(cc, tag);
     grpc_cq_end_op(&exec_ctx, cc, tag, GRPC_ERROR_NONE,
                    do_nothing_end_completion, NULL, &completion);

     ev = grpc_completion_queue_next(cc, gpr_inf_past(GPR_CLOCK_REALTIME), NULL);
     GPR_ASSERT(ev.type == GRPC_OP_COMPLETE);
     GPR_ASSERT(ev.tag == tag);
     GPR_ASSERT(ev.success);

     shutdown_and_destroy(cc);
     grpc_exec_ctx_finish(&exec_ctx);
   }
 }

 static void test_shutdown_then_next_polling(void) {
   grpc_cq_polling_type polling_types[] = {
       GRPC_CQ_DEFAULT_POLLING, GRPC_CQ_NON_LISTENING, GRPC_CQ_NON_POLLING};
   grpc_completion_queue *cc;
   grpc_completion_queue_attributes attr;
   grpc_event event;
   LOG_TEST("test_shutdown_then_next_polling");

   attr.version = 1;
   attr.cq_completion_type = GRPC_CQ_NEXT;
   for (size_t i = 0; i < GPR_ARRAY_SIZE(polling_types); i++) {
     attr.cq_polling_type = polling_types[i];
     cc = grpc_completion_queue_create(
         grpc_completion_queue_factory_lookup(&attr), &attr, NULL);
     grpc_completion_queue_shutdown(cc);
     event =
         grpc_completion_queue_next(cc, gpr_inf_past(GPR_CLOCK_REALTIME), NULL);
     GPR_ASSERT(event.type == GRPC_QUEUE_SHUTDOWN);
     grpc_completion_queue_destroy(cc);
   }
 }

 static void test_shutdown_then_next_with_timeout(void) {
   grpc_cq_polling_type polling_types[] = {
       GRPC_CQ_DEFAULT_POLLING, GRPC_CQ_NON_LISTENING, GRPC_CQ_NON_POLLING};
   grpc_completion_queue *cc;
   grpc_completion_queue_attributes attr;
   grpc_event event;
   LOG_TEST("test_shutdown_then_next_with_timeout");

   attr.version = 1;
   attr.cq_completion_type = GRPC_CQ_NEXT;
   for (size_t i = 0; i < GPR_ARRAY_SIZE(polling_types); i++) {
     attr.cq_polling_type = polling_types[i];
     cc = grpc_completion_queue_create(
         grpc_completion_queue_factory_lookup(&attr), &attr, NULL);

     grpc_completion_queue_shutdown(cc);
     event = grpc_completion_queue_next(cc, gpr_inf_future(GPR_CLOCK_REALTIME),
                                        NULL);
     GPR_ASSERT(event.type == GRPC_QUEUE_SHUTDOWN);
     grpc_completion_queue_destroy(cc);
   }
 }

 static void test_pluck(void) {
   grpc_event ev;
   grpc_completion_queue *cc;
   void *tags[128];
   grpc_cq_completion completions[GPR_ARRAY_SIZE(tags)];
   grpc_cq_polling_type polling_types[] = {
       GRPC_CQ_DEFAULT_POLLING, GRPC_CQ_NON_LISTENING, GRPC_CQ_NON_POLLING};
   grpc_completion_queue_attributes attr;
   grpc_exec_ctx init_exec_ctx = GRPC_EXEC_CTX_INIT;
   grpc_exec_ctx exec_ctx;
   unsigned i, j;

   LOG_TEST("test_pluck");

   for (i = 0; i < GPR_ARRAY_SIZE(tags); i++) {
     tags[i] = create_test_tag();
     for (j = 0; j < i; j++) {
       GPR_ASSERT(tags[i] != tags[j]);
     }
   }

   attr.version = 1;
   attr.cq_completion_type = GRPC_CQ_PLUCK;
   for (size_t pidx = 0; pidx < GPR_ARRAY_SIZE(polling_types); pidx++) {
     exec_ctx = init_exec_ctx;  // reset exec_ctx
     attr.cq_polling_type = polling_types[pidx];
     cc = grpc_completion_queue_create(
         grpc_completion_queue_factory_lookup(&attr), &attr, NULL);

     for (i = 0; i < GPR_ARRAY_SIZE(tags); i++) {
       grpc_cq_begin_op(cc, tags[i]);
       grpc_cq_end_op(&exec_ctx, cc, tags[i], GRPC_ERROR_NONE,
                      do_nothing_end_completion, NULL, &completions[i]);
     }

     for (i = 0; i < GPR_ARRAY_SIZE(tags); i++) {
       ev = grpc_completion_queue_pluck(cc, tags[i],
                                        gpr_inf_past(GPR_CLOCK_REALTIME), NULL);
       GPR_ASSERT(ev.tag == tags[i]);
     }

     for (i = 0; i < GPR_ARRAY_SIZE(tags); i++) {
       grpc_cq_begin_op(cc, tags[i]);
       grpc_cq_end_op(&exec_ctx, cc, tags[i], GRPC_ERROR_NONE,
                      do_nothing_end_completion, NULL, &completions[i]);
     }

     for (i = 0; i < GPR_ARRAY_SIZE(tags); i++) {
       ev = grpc_completion_queue_pluck(cc, tags[GPR_ARRAY_SIZE(tags) - i - 1],
                                        gpr_inf_past(GPR_CLOCK_REALTIME), NULL);
       GPR_ASSERT(ev.tag == tags[GPR_ARRAY_SIZE(tags) - i - 1]);
     }

     shutdown_and_destroy(cc);
     grpc_exec_ctx_finish(&exec_ctx);
   }
 }

 static void test_pluck_after_shutdown(void) {
   grpc_cq_polling_type polling_types[] = {
       GRPC_CQ_DEFAULT_POLLING, GRPC_CQ_NON_LISTENING, GRPC_CQ_NON_POLLING};
   grpc_event ev;
   grpc_completion_queue *cc;
   grpc_completion_queue_attributes attr;

   LOG_TEST("test_pluck_after_shutdown");

   attr.version = 1;
   attr.cq_completion_type = GRPC_CQ_PLUCK;
   for (size_t i = 0; i < GPR_ARRAY_SIZE(polling_types); i++) {
     attr.cq_polling_type = polling_types[i];
     cc = grpc_completion_queue_create(
         grpc_completion_queue_factory_lookup(&attr), &attr, NULL);
     grpc_completion_queue_shutdown(cc);
     ev = grpc_completion_queue_pluck(cc, NULL,
                                      gpr_inf_future(GPR_CLOCK_REALTIME), NULL);
     GPR_ASSERT(ev.type == GRPC_QUEUE_SHUTDOWN);
     grpc_completion_queue_destroy(cc);
   }
 }

 struct thread_state {
   grpc_completion_queue *cc;
   void *tag;
 };

 int main(int argc, char **argv) {
   grpc_test_init(argc, argv);
   grpc_init();
   test_no_op();
   test_pollset_conversion();
   test_wait_empty();
   test_shutdown_then_next_polling();
   test_shutdown_then_next_with_timeout();
   test_cq_end_op();
   test_pluck();
   test_pluck_after_shutdown();
   grpc_shutdown();
   return 0;
 }
	/*
	*
	* Copyright 2015, Google Inc.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following disclaimer
	* in the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name of Google Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	*/

	#include "src/core/lib/surface/completion_queue.h"

	#include <grpc/support/alloc.h>
	#include <grpc/support/log.h>
	#include <grpc/support/time.h>
	#include <grpc/support/useful.h>
	#include "src/core/lib/iomgr/iomgr.h"
	#include "test/core/util/test_config.h"

	#define LOG_TEST(x) gpr_log(GPR_INFO, "%s", x)

	static void *create_test_tag(void) {
	static intptr_t i = 0;
	return (void *)(++i);
	}

	/* helper for tests to shutdown correctly and tersely */
	static void shutdown_and_destroy(grpc_completion_queue *cc) {
	grpc_event ev;
	grpc_completion_queue_shutdown(cc);

	switch (grpc_get_cq_completion_type(cc)) {
	case GRPC_CQ_NEXT: {
	ev = grpc_completion_queue_next(cc, gpr_inf_past(GPR_CLOCK_REALTIME),
	NULL);
	break;
	}
	case GRPC_CQ_PLUCK: {
	ev = grpc_completion_queue_pluck(cc, create_test_tag(),
	gpr_inf_past(GPR_CLOCK_REALTIME), NULL);
	break;
	}
	default: {
	gpr_log(GPR_ERROR, "Unknown completion type");
	break;
	}
	}

	GPR_ASSERT(ev.type == GRPC_QUEUE_SHUTDOWN);
	grpc_completion_queue_destroy(cc);
	}

	/* ensure we can create and destroy a completion channel */
	static void test_no_op(void) {
	grpc_cq_completion_type completion_types[] = {GRPC_CQ_NEXT, GRPC_CQ_PLUCK};
	grpc_cq_polling_type polling_types[] = {
	GRPC_CQ_DEFAULT_POLLING, GRPC_CQ_NON_LISTENING, GRPC_CQ_NON_POLLING};
	grpc_completion_queue_attributes attr;
	LOG_TEST("test_no_op");

	attr.version = 1;
	for (size_t i = 0; i < GPR_ARRAY_SIZE(completion_types); i++) {
	for (size_t j = 0; j < GPR_ARRAY_SIZE(polling_types); j++) {
	attr.cq_completion_type = completion_types[i];
	attr.cq_polling_type = polling_types[j];
	shutdown_and_destroy(grpc_completion_queue_create(
	grpc_completion_queue_factory_lookup(&attr), &attr, NULL));
	}
	}
	}

	static void test_pollset_conversion(void) {
	grpc_cq_completion_type completion_types[] = {GRPC_CQ_NEXT, GRPC_CQ_PLUCK};
	grpc_cq_polling_type polling_types[] = {GRPC_CQ_DEFAULT_POLLING,
	GRPC_CQ_NON_LISTENING};
	grpc_completion_queue *cq;
	grpc_completion_queue_attributes attr;

	LOG_TEST("test_pollset_conversion");

	attr.version = 1;
	for (size_t i = 0; i < GPR_ARRAY_SIZE(completion_types); i++) {
	for (size_t j = 0; j < GPR_ARRAY_SIZE(polling_types); j++) {
	attr.cq_completion_type = completion_types[i];
	attr.cq_polling_type = polling_types[j];
	cq = grpc_completion_queue_create(
	grpc_completion_queue_factory_lookup(&attr), &attr, NULL);
	GPR_ASSERT(grpc_cq_from_pollset(grpc_cq_pollset(cq)) == cq);
	shutdown_and_destroy(cq);
	}
	}
	}

	static void test_wait_empty(void) {
	grpc_cq_polling_type polling_types[] = {
	GRPC_CQ_DEFAULT_POLLING, GRPC_CQ_NON_LISTENING, GRPC_CQ_NON_POLLING};
	grpc_completion_queue *cc;
	grpc_completion_queue_attributes attr;
	grpc_event event;

	LOG_TEST("test_wait_empty");

	attr.version = 1;
	attr.cq_completion_type = GRPC_CQ_NEXT;
	for (size_t i = 0; i < GPR_ARRAY_SIZE(polling_types); i++) {
	attr.cq_polling_type = polling_types[i];
	cc = grpc_completion_queue_create(
	grpc_completion_queue_factory_lookup(&attr), &attr, NULL);
	event = grpc_completion_queue_next(cc, gpr_now(GPR_CLOCK_REALTIME), NULL);
	GPR_ASSERT(event.type == GRPC_QUEUE_TIMEOUT);
	shutdown_and_destroy(cc);
	}
	}

	static void do_nothing_end_completion(grpc_exec_ctx exec_ctx, void arg,
	grpc_cq_completion *c) {}

	static void test_cq_end_op(void) {
	grpc_event ev;
	grpc_completion_queue *cc;
	grpc_cq_completion completion;
	grpc_cq_polling_type polling_types[] = {
	GRPC_CQ_DEFAULT_POLLING, GRPC_CQ_NON_LISTENING, GRPC_CQ_NON_POLLING};
	grpc_completion_queue_attributes attr;
	grpc_exec_ctx init_exec_ctx = GRPC_EXEC_CTX_INIT;
	grpc_exec_ctx exec_ctx;
	void *tag = create_test_tag();

	LOG_TEST("test_cq_end_op");

	attr.version = 1;
	attr.cq_completion_type = GRPC_CQ_NEXT;
	for (size_t i = 0; i < GPR_ARRAY_SIZE(polling_types); i++) {
	exec_ctx = init_exec_ctx; // Reset exec_ctx
	attr.cq_polling_type = polling_types[i];
	cc = grpc_completion_queue_create(
	grpc_completion_queue_factory_lookup(&attr), &attr, NULL);

	grpc_cq_begin_op(cc, tag);
	grpc_cq_end_op(&exec_ctx, cc, tag, GRPC_ERROR_NONE,
	do_nothing_end_completion, NULL, &completion);

	ev = grpc_completion_queue_next(cc, gpr_inf_past(GPR_CLOCK_REALTIME), NULL);
	GPR_ASSERT(ev.type == GRPC_OP_COMPLETE);
	GPR_ASSERT(ev.tag == tag);
	GPR_ASSERT(ev.success);

	shutdown_and_destroy(cc);
	grpc_exec_ctx_finish(&exec_ctx);
	}
	}

	static void test_shutdown_then_next_polling(void) {
	grpc_cq_polling_type polling_types[] = {
	GRPC_CQ_DEFAULT_POLLING, GRPC_CQ_NON_LISTENING, GRPC_CQ_NON_POLLING};
	grpc_completion_queue *cc;
	grpc_completion_queue_attributes attr;
	grpc_event event;
	LOG_TEST("test_shutdown_then_next_polling");

	attr.version = 1;
	attr.cq_completion_type = GRPC_CQ_NEXT;
	for (size_t i = 0; i < GPR_ARRAY_SIZE(polling_types); i++) {
	attr.cq_polling_type = polling_types[i];
	cc = grpc_completion_queue_create(
	grpc_completion_queue_factory_lookup(&attr), &attr, NULL);
	grpc_completion_queue_shutdown(cc);
	event =
	grpc_completion_queue_next(cc, gpr_inf_past(GPR_CLOCK_REALTIME), NULL);
	GPR_ASSERT(event.type == GRPC_QUEUE_SHUTDOWN);
	grpc_completion_queue_destroy(cc);
	}
	}

	static void test_shutdown_then_next_with_timeout(void) {
	grpc_cq_polling_type polling_types[] = {
	GRPC_CQ_DEFAULT_POLLING, GRPC_CQ_NON_LISTENING, GRPC_CQ_NON_POLLING};
	grpc_completion_queue *cc;
	grpc_completion_queue_attributes attr;
	grpc_event event;
	LOG_TEST("test_shutdown_then_next_with_timeout");

	attr.version = 1;
	attr.cq_completion_type = GRPC_CQ_NEXT;
	for (size_t i = 0; i < GPR_ARRAY_SIZE(polling_types); i++) {
	attr.cq_polling_type = polling_types[i];
	cc = grpc_completion_queue_create(
	grpc_completion_queue_factory_lookup(&attr), &attr, NULL);

	grpc_completion_queue_shutdown(cc);
	event = grpc_completion_queue_next(cc, gpr_inf_future(GPR_CLOCK_REALTIME),
	NULL);
	GPR_ASSERT(event.type == GRPC_QUEUE_SHUTDOWN);
	grpc_completion_queue_destroy(cc);
	}
	}

	static void test_pluck(void) {
	grpc_event ev;
	grpc_completion_queue *cc;
	void *tags[128];
	grpc_cq_completion completions[GPR_ARRAY_SIZE(tags)];
	grpc_cq_polling_type polling_types[] = {
	GRPC_CQ_DEFAULT_POLLING, GRPC_CQ_NON_LISTENING, GRPC_CQ_NON_POLLING};
	grpc_completion_queue_attributes attr;
	grpc_exec_ctx init_exec_ctx = GRPC_EXEC_CTX_INIT;
	grpc_exec_ctx exec_ctx;
	unsigned i, j;

	LOG_TEST("test_pluck");

	for (i = 0; i < GPR_ARRAY_SIZE(tags); i++) {
	tags[i] = create_test_tag();
	for (j = 0; j < i; j++) {
	GPR_ASSERT(tags[i] != tags[j]);
	}
	}

	attr.version = 1;
	attr.cq_completion_type = GRPC_CQ_PLUCK;
	for (size_t pidx = 0; pidx < GPR_ARRAY_SIZE(polling_types); pidx++) {
	exec_ctx = init_exec_ctx; // reset exec_ctx
	attr.cq_polling_type = polling_types[pidx];
	cc = grpc_completion_queue_create(
	grpc_completion_queue_factory_lookup(&attr), &attr, NULL);

	for (i = 0; i < GPR_ARRAY_SIZE(tags); i++) {
	grpc_cq_begin_op(cc, tags[i]);
	grpc_cq_end_op(&exec_ctx, cc, tags[i], GRPC_ERROR_NONE,
	do_nothing_end_completion, NULL, &completions[i]);
	}

	for (i = 0; i < GPR_ARRAY_SIZE(tags); i++) {
	ev = grpc_completion_queue_pluck(cc, tags[i],
	gpr_inf_past(GPR_CLOCK_REALTIME), NULL);
	GPR_ASSERT(ev.tag == tags[i]);
	}

	for (i = 0; i < GPR_ARRAY_SIZE(tags); i++) {
	grpc_cq_begin_op(cc, tags[i]);
	grpc_cq_end_op(&exec_ctx, cc, tags[i], GRPC_ERROR_NONE,
	do_nothing_end_completion, NULL, &completions[i]);
	}

	for (i = 0; i < GPR_ARRAY_SIZE(tags); i++) {
	ev = grpc_completion_queue_pluck(cc, tags[GPR_ARRAY_SIZE(tags) - i - 1],
	gpr_inf_past(GPR_CLOCK_REALTIME), NULL);
	GPR_ASSERT(ev.tag == tags[GPR_ARRAY_SIZE(tags) - i - 1]);
	}

	shutdown_and_destroy(cc);
	grpc_exec_ctx_finish(&exec_ctx);
	}
	}

	static void test_pluck_after_shutdown(void) {
	grpc_cq_polling_type polling_types[] = {
	GRPC_CQ_DEFAULT_POLLING, GRPC_CQ_NON_LISTENING, GRPC_CQ_NON_POLLING};
	grpc_event ev;
	grpc_completion_queue *cc;
	grpc_completion_queue_attributes attr;

	LOG_TEST("test_pluck_after_shutdown");

	attr.version = 1;
	attr.cq_completion_type = GRPC_CQ_PLUCK;
	for (size_t i = 0; i < GPR_ARRAY_SIZE(polling_types); i++) {
	attr.cq_polling_type = polling_types[i];
	cc = grpc_completion_queue_create(
	grpc_completion_queue_factory_lookup(&attr), &attr, NULL);
	grpc_completion_queue_shutdown(cc);
	ev = grpc_completion_queue_pluck(cc, NULL,
	gpr_inf_future(GPR_CLOCK_REALTIME), NULL);
	GPR_ASSERT(ev.type == GRPC_QUEUE_SHUTDOWN);
	grpc_completion_queue_destroy(cc);
	}
	}

	struct thread_state {
	grpc_completion_queue *cc;
	void *tag;
	};

	int main(int argc, char **argv) {
	grpc_test_init(argc, argv);
	grpc_init();
	test_no_op();
	test_pollset_conversion();
	test_wait_empty();
	test_shutdown_then_next_polling();
	test_shutdown_then_next_with_timeout();
	test_cq_end_op();
	test_pluck();
	test_pluck_after_shutdown();
	grpc_shutdown();
	return 0;
	}