X-Git-Url: https://git.lttng.org/?p=urcu.git;a=blobdiff_plain;f=test_urcu.c;h=72cceebdd331473d35e516721a9640cf2a3a737f;hp=b92a7d74de5c23fd55d5959e8e5f514d314ef090;hb=af02d47e5d0712e5ccde6d8f1ee89f18de798cad;hpb=f4a486ac095bd844d0c18995737d589b8f085b69 diff --git a/test_urcu.c b/test_urcu.c index b92a7d7..72cceeb 100644 --- a/test_urcu.c +++ b/test_urcu.c @@ -5,7 +5,19 @@ * * Copyright February 2009 - Mathieu Desnoyers * - * Distributed under GPLv2 + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include @@ -34,25 +46,43 @@ static inline pid_t gettid(void) } #endif +#ifndef DYNAMIC_LINK_TEST +#define _LGPL_SOURCE +#else +#define debug_yield_read() +#endif #include "urcu.h" struct test_array { int a; }; +static int no_writer_delay; + static struct test_array *test_rcu_pointer; static unsigned long duration; static time_t start_time; static unsigned long __thread duration_interval; -#define DURATION_TEST_DELAY 100 +#define DURATION_TEST_DELAY_WRITE 4 +#define DURATION_TEST_DELAY_READ 100 /* * returns 0 if test should end. */ -static int test_duration(void) +static int test_duration_write(void) +{ + if (duration_interval++ >= DURATION_TEST_DELAY_WRITE) { + duration_interval = 0; + if (time(NULL) - start_time >= duration) + return 0; + } + return 1; +} + +static int test_duration_read(void) { - if (duration_interval++ >= DURATION_TEST_DELAY) { + if (duration_interval++ >= DURATION_TEST_DELAY_READ) { duration_interval = 0; if (time(NULL) - start_time >= duration) return 0; @@ -63,6 +93,9 @@ static int test_duration(void) #define NR_READ 10 #define NR_WRITE 9 +static unsigned long long __thread nr_writes; +static unsigned long long __thread nr_reads; + pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; void rcu_copy_mutex_lock(void) @@ -86,60 +119,104 @@ void rcu_copy_mutex_unlock(void) } } -void *thr_reader(void *arg) +/* + * malloc/free are reusing memory areas too quickly, which does not let us + * test races appropriately. Use a large circular array for allocations. + * ARRAY_SIZE is larger than NR_WRITE, which insures we never run over our tail. + */ +#define ARRAY_SIZE (1048576 * NR_WRITE) +#define ARRAY_POISON 0xDEADBEEF +static int array_index; +static struct test_array test_array[ARRAY_SIZE]; + +static struct test_array *test_array_alloc(void) +{ + struct test_array *ret; + int index; + + rcu_copy_mutex_lock(); + index = array_index % ARRAY_SIZE; + assert(test_array[index].a == ARRAY_POISON || + test_array[index].a == 0); + ret = &test_array[index]; + array_index++; + if (array_index == ARRAY_SIZE) + array_index = 0; + rcu_copy_mutex_unlock(); + return ret; +} + +static void test_array_free(struct test_array *ptr) +{ + if (!ptr) + return; + rcu_copy_mutex_lock(); + ptr->a = ARRAY_POISON; + rcu_copy_mutex_unlock(); +} + +void *thr_reader(void *_count) { + unsigned long long *count = _count; struct test_array *local_ptr; printf("thread_begin %s, thread id : %lx, tid %lu\n", "reader", pthread_self(), (unsigned long)gettid()); - urcu_register_thread(); + rcu_register_thread(); for (;;) { rcu_read_lock(); local_ptr = rcu_dereference(test_rcu_pointer); + debug_yield_read(); if (local_ptr) assert(local_ptr->a == 8); rcu_read_unlock(); - if (!test_duration()) + nr_reads++; + if (!test_duration_read()) break; } - urcu_unregister_thread(); + rcu_unregister_thread(); + *count = nr_reads; printf("thread_end %s, thread id : %lx, tid %lu\n", "reader", pthread_self(), (unsigned long)gettid()); return ((void*)1); } -void *thr_writer(void *arg) +void *thr_writer(void *_count) { + unsigned long long *count = _count; struct test_array *new, *old; printf("thread_begin %s, thread id : %lx, tid %lu\n", "writer", pthread_self(), (unsigned long)gettid()); for (;;) { - new = malloc(sizeof(struct test_array)); + new = test_array_alloc(); rcu_copy_mutex_lock(); old = test_rcu_pointer; if (old) assert(old->a == 8); new->a = 8; - old = urcu_publish_content(&test_rcu_pointer, new); + old = rcu_publish_content(&test_rcu_pointer, new); rcu_copy_mutex_unlock(); /* can be done after unlock */ if (old) old->a = 0; - free(old); - if (!test_duration()) + test_array_free(old); + nr_writes++; + if (!test_duration_write()) break; - usleep(1); + if (!no_writer_delay) + usleep(1); } printf("thread_end %s, thread id : %lx, tid %lu\n", "writer", pthread_self(), (unsigned long)gettid()); + *count = nr_writes; return ((void*)2); } @@ -149,6 +226,7 @@ void show_usage(int argc, char **argv) #ifdef DEBUG_YIELD printf(" [-r] [-w] (yield reader and/or writer)"); #endif + printf(" [-n] (disable writer delay)"); printf("\n"); } @@ -157,6 +235,8 @@ int main(int argc, char **argv) int err; pthread_t tid_reader[NR_READ], tid_writer[NR_WRITE]; void *tret; + unsigned long long count_reader[NR_READ], count_writer[NR_WRITE]; + unsigned long long tot_reads = 0, tot_writes = 0; int i; if (argc < 2) { @@ -170,20 +250,23 @@ int main(int argc, char **argv) return -1; } -#ifdef DEBUG_YIELD for (i = 2; i < argc; i++) { if (argv[i][0] != '-') continue; switch (argv[i][1]) { +#ifdef DEBUG_YIELD case 'r': yield_active |= YIELD_READ; break; case 'w': yield_active |= YIELD_WRITE; break; +#endif + case 'n': + no_writer_delay = 1; + break; } } -#endif printf("running test for %lu seconds.\n", duration); start_time = time(NULL); @@ -191,12 +274,14 @@ int main(int argc, char **argv) "main", pthread_self(), (unsigned long)gettid()); for (i = 0; i < NR_READ; i++) { - err = pthread_create(&tid_reader[i], NULL, thr_reader, NULL); + err = pthread_create(&tid_reader[i], NULL, thr_reader, + &count_reader[i]); if (err != 0) exit(1); } for (i = 0; i < NR_WRITE; i++) { - err = pthread_create(&tid_writer[i], NULL, thr_writer, NULL); + err = pthread_create(&tid_writer[i], NULL, thr_writer, + &count_writer[i]); if (err != 0) exit(1); } @@ -205,13 +290,18 @@ int main(int argc, char **argv) err = pthread_join(tid_reader[i], &tret); if (err != 0) exit(1); + tot_reads += count_reader[i]; } for (i = 0; i < NR_WRITE; i++) { err = pthread_join(tid_writer[i], &tret); if (err != 0) exit(1); + tot_writes += count_writer[i]; } - free(test_rcu_pointer); + + printf("total number of reads : %llu, writes %llu\n", tot_reads, + tot_writes); + test_array_free(test_rcu_pointer); return 0; }