From: Mathieu Desnoyers Date: Sun, 9 Jun 2013 20:38:45 +0000 (-0400) Subject: rcuja range test X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=91233b5bbabdd338e0a9a20df2d3b0a026f8fda7;p=userspace-rcu.git rcuja range test Signed-off-by: Mathieu Desnoyers --- diff --git a/tests/Makefile.am b/tests/Makefile.am index a290524..1521ecb 100644 --- a/tests/Makefile.am +++ b/tests/Makefile.am @@ -22,7 +22,7 @@ noinst_PROGRAMS = test_urcu test_urcu_dynamic_link test_urcu_timing \ test_urcu_lfs_rcu_dynlink \ test_urcu_multiflavor test_urcu_multiflavor_dynlink \ test_urcu_fork \ - test_urcu_ja + test_urcu_ja test_urcu_ja_range noinst_HEADERS = rcutorture.h test_urcu_multiflavor.h cpuset.h if COMPAT_ARCH @@ -234,6 +234,11 @@ test_urcu_ja_SOURCES = test_urcu_ja.c test_urcu_ja.h \ test_urcu_ja_CFLAGS = -DRCU_QSBR $(AM_CFLAGS) test_urcu_ja_LDADD = $(URCU_QSBR_LIB) $(URCU_CDS_LIB) +test_urcu_ja_range_SOURCES = test_urcu_ja_range.c test_urcu_ja_range.h \ + $(COMPAT) +test_urcu_ja_range_CFLAGS = -DRCU_QSBR $(AM_CFLAGS) +test_urcu_ja_range_LDADD = $(URCU_QSBR_LIB) $(URCU_CDS_LIB) + urcutorture.c: api.h check-am: diff --git a/tests/test_urcu_ja_range.c b/tests/test_urcu_ja_range.c new file mode 100644 index 0000000..3d23145 --- /dev/null +++ b/tests/test_urcu_ja_range.c @@ -0,0 +1,647 @@ +/* + * test_urcu_ja_range.c + * + * Userspace RCU library - test program + * + * Copyright 2009-2012 - Mathieu Desnoyers + * + * 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. + */ + +#define _GNU_SOURCE +#include "test_urcu_ja_range.h" +#include +#include + +DEFINE_URCU_TLS(unsigned int, rand_lookup); +DEFINE_URCU_TLS(unsigned long, nr_add); +DEFINE_URCU_TLS(unsigned long, nr_addexist); +DEFINE_URCU_TLS(unsigned long, nr_del); +DEFINE_URCU_TLS(unsigned long, nr_delnoent); +DEFINE_URCU_TLS(unsigned long, lookup_fail); +DEFINE_URCU_TLS(unsigned long, lookup_ok); + +struct cds_ja *test_ja; + +volatile int test_go, test_stop; + +unsigned long wdelay; + +unsigned long duration; + +/* read-side C.S. duration, in loops */ +unsigned long rduration; + +unsigned long init_populate; +int add_only; + +unsigned long init_pool_offset, lookup_pool_offset, write_pool_offset; +unsigned long init_pool_size = DEFAULT_RAND_POOL, + lookup_pool_size = DEFAULT_RAND_POOL, + write_pool_size = DEFAULT_RAND_POOL; +int validate_lookup; +int sanity_test; +unsigned int key_bits = 32; + +int count_pipe[2]; + +int verbose_mode; + +unsigned int cpu_affinities[NR_CPUS]; +unsigned int next_aff = 0; +int use_affinity = 0; + +pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER; + +DEFINE_URCU_TLS(unsigned long long, nr_writes); +DEFINE_URCU_TLS(unsigned long long, nr_reads); + +unsigned int nr_readers; +unsigned int nr_writers; + +static unsigned int add_ratio = 50; +static uint64_t key_mul = 1ULL; + +static int add_unique, add_replace; + +static pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; + +static int leak_detection; +static unsigned long test_nodes_allocated, test_nodes_freed; + +void set_affinity(void) +{ + cpu_set_t mask; + int cpu; + int ret; + + if (!use_affinity) + return; + +#if HAVE_SCHED_SETAFFINITY + ret = pthread_mutex_lock(&affinity_mutex); + if (ret) { + perror("Error in pthread mutex lock"); + exit(-1); + } + cpu = cpu_affinities[next_aff++]; + ret = pthread_mutex_unlock(&affinity_mutex); + if (ret) { + perror("Error in pthread mutex unlock"); + exit(-1); + } + CPU_ZERO(&mask); + CPU_SET(cpu, &mask); +#if SCHED_SETAFFINITY_ARGS == 2 + sched_setaffinity(0, &mask); +#else + sched_setaffinity(0, sizeof(mask), &mask); +#endif +#endif /* HAVE_SCHED_SETAFFINITY */ +} + +void rcu_copy_mutex_lock(void) +{ + int ret; + ret = pthread_mutex_lock(&rcu_copy_mutex); + if (ret) { + perror("Error in pthread mutex lock"); + exit(-1); + } +} + +void rcu_copy_mutex_unlock(void) +{ + int ret; + + ret = pthread_mutex_unlock(&rcu_copy_mutex); + if (ret) { + perror("Error in pthread mutex unlock"); + exit(-1); + } +} + +void show_usage(int argc, char **argv) +{ + printf("Usage : %s nr_readers nr_writers duration (s)\n", argv[0]); +#ifdef DEBUG_YIELD + printf(" [-r] [-w] (yield reader and/or writer)\n"); +#endif + printf(" [-d delay] (writer period (us))\n"); + printf(" [-c duration] (reader C.S. duration (in loops))\n"); + printf(" [-v] (verbose output)\n"); + printf(" [-a cpu#] [-a cpu#]... (affinity)\n"); + printf(" [-u] Add unique keys.\n"); + printf(" [-s] Replace existing keys.\n"); +printf(" [not -u nor -s] Add entries (supports redundant keys).\n"); + printf(" [-r ratio] Add ratio (in %% of add+removal).\n"); + printf(" [-k] Populate init nodes.\n"); + printf(" [-R offset] Lookup pool offset.\n"); + printf(" [-S offset] Write pool offset.\n"); + printf(" [-T offset] Init pool offset.\n"); + printf(" [-M size] Lookup pool size.\n"); + printf(" [-N size] Write pool size.\n"); + printf(" [-O size] Init pool size.\n"); + printf(" [-V] Validate lookups of init values (use with filled init pool, same lookup range, with different write range).\n"); + printf(" [-t] Do sanity test.\n"); + printf(" [-B] Key bits for multithread test (default: 32).\n"); + printf(" [-m factor] Key multiplication factor.\n"); + printf(" [-l] Memory leak detection.\n"); + printf("\n\n"); +} + +enum urcu_ja_addremove { + AR_RANDOM = 0, + AR_ADD = 1, + AR_REMOVE = -1, +}; /* 1: add, -1 remove, 0: random */ + +static enum urcu_ja_addremove addremove; /* 1: add, -1 remove, 0: random */ + +static +void test_ja_rw_sigusr1_handler(int signo) +{ + switch (addremove) { + case AR_ADD: + printf("Add/Remove: random.\n"); + addremove = AR_RANDOM; + break; + case AR_RANDOM: + printf("Add/Remove: remove only.\n"); + addremove = AR_REMOVE; + break; + case AR_REMOVE: + printf("Add/Remove: add only.\n"); + addremove = AR_ADD; + break; + } +} + +static +void *test_ja_rw_thr_reader(void *_count) +{ + unsigned long long *count = _count; + struct cds_ja_range *range; + uint64_t key; + + printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", + "reader", pthread_self(), (unsigned long) gettid()); + + set_affinity(); + + rcu_register_thread(); + + while (!test_go) + { + } + cmm_smp_mb(); + + for (;;) { + rcu_read_lock(); + + /* note: only looking up ulong keys */ + key = ((unsigned long) rand_r(&URCU_TLS(rand_lookup)) % lookup_pool_size) + lookup_pool_offset; + key *= key_mul; + range = cds_ja_range_lookup(test_ja, key); + if (!range) { + if (validate_lookup) { + printf("[ERROR] Lookup cannot find initial node.\n"); + exit(-1); + } + URCU_TLS(lookup_fail)++; + } else { + range = cds_ja_range_lock(range); + if (!range) { + if (validate_lookup) { + printf("[ERROR] Lookup cannot find initial node.\n"); + exit(-1); + } + } else { + URCU_TLS(lookup_ok)++; + cds_ja_range_unlock(range); + } + } + rcu_debug_yield_read(); + if (caa_unlikely(rduration)) + loop_sleep(rduration); + rcu_read_unlock(); + URCU_TLS(nr_reads)++; + if (caa_unlikely(!test_duration_read())) + break; + if (caa_unlikely((URCU_TLS(nr_reads) & ((1 << 10) - 1)) == 0)) + rcu_quiescent_state(); + } + + rcu_unregister_thread(); + + *count = URCU_TLS(nr_reads); + printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", + "reader", pthread_self(), (unsigned long) gettid()); + printf_verbose("readid : %lx, lookupfail %lu, lookupok %lu\n", + pthread_self(), URCU_TLS(lookup_fail), + URCU_TLS(lookup_ok)); + return ((void*)1); +} + +static +int is_add(void) +{ + return ((unsigned int) rand_r(&URCU_TLS(rand_lookup)) % 100) < add_ratio; +} + +static +void *test_ja_rw_thr_writer(void *_count) +{ + struct wr_count *count = _count; + int ret; + + printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", + "writer", pthread_self(), (unsigned long) gettid()); + + set_affinity(); + + rcu_register_thread(); + + while (!test_go) + { + } + cmm_smp_mb(); + + for (;;) { + if ((addremove == AR_ADD) + || (addremove == AR_RANDOM && is_add())) { + struct cds_ja_range *range; + uint64_t start, end, tmp; + + /* note: only inserting ulong keys */ + start = ((unsigned long) rand_r(&URCU_TLS(rand_lookup)) % write_pool_size) + write_pool_offset; + end = ((unsigned long) rand_r(&URCU_TLS(rand_lookup)) % write_pool_size) + write_pool_offset; + start *= key_mul; + end *= key_mul; + if (start > end) { + tmp = start; + start = end; + end = tmp; + } + rcu_read_lock(); + range = cds_ja_range_add(test_ja, start, end, NULL); + if (!range) { + fprintf(stderr, "Error in cds_ja_add: %d\n", ret); + } else { + URCU_TLS(nr_add)++; + } + rcu_read_unlock(); + } else { + struct cds_ja_range *range; + uint64_t key; + + /* May delete */ + /* note: only deleting ulong keys */ + key = ((unsigned long) rand_r(&URCU_TLS(rand_lookup)) % write_pool_size) + write_pool_offset; + key *= key_mul; + + rcu_read_lock(); + + range = cds_ja_range_lookup(test_ja, key); + if (range) { + ret = cds_ja_range_del(test_ja, range); + if (!ret) { + URCU_TLS(nr_del)++; + } else { + URCU_TLS(nr_delnoent)++; + } + } else { + URCU_TLS(nr_delnoent)++; + } + rcu_read_unlock(); + } + + URCU_TLS(nr_writes)++; + if (caa_unlikely(!test_duration_write())) + break; + if (caa_unlikely(wdelay)) + loop_sleep(wdelay); + if (caa_unlikely((URCU_TLS(nr_writes) & ((1 << 10) - 1)) == 0)) + rcu_quiescent_state(); + } + + rcu_unregister_thread(); + + printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", + "writer", pthread_self(), (unsigned long) gettid()); + printf_verbose("info id %lx: nr_add %lu, nr_addexist %lu, nr_del %lu, " + "nr_delnoent %lu\n", pthread_self(), URCU_TLS(nr_add), + URCU_TLS(nr_addexist), URCU_TLS(nr_del), + URCU_TLS(nr_delnoent)); + count->update_ops = URCU_TLS(nr_writes); + count->add = URCU_TLS(nr_add); + count->add_exist = URCU_TLS(nr_addexist); + count->remove = URCU_TLS(nr_del); + return ((void*)2); +} + +static +int do_mt_populate_ja(void) +{ + uint64_t iter; + int ret; + + if (!init_populate) + return 0; + + printf("Starting rw test\n"); + + for (iter = init_pool_offset; iter < init_pool_offset + init_pool_size; iter++) { + struct cds_ja_range *range; + uint64_t key; + + /* note: only inserting ulong keys */ + key = (unsigned long) iter; + key *= key_mul; + rcu_read_lock(); + range = cds_ja_range_add(test_ja, key, key, NULL); + URCU_TLS(nr_add)++; + URCU_TLS(nr_writes)++; + rcu_read_unlock(); + if (!range) { + fprintf(stderr, "Error adding range %" PRIu64 "\n", + key); + assert(0); + } + } + return 0; +} + +static +int do_mt_test(void) +{ + pthread_t *tid_reader, *tid_writer; + void *tret; + int ret, i, err; + unsigned long long *count_reader; + struct wr_count *count_writer; + unsigned long long tot_reads = 0, tot_writes = 0, + tot_add = 0, tot_add_exist = 0, tot_remove = 0; + unsigned int remain; + + tid_reader = malloc(sizeof(*tid_reader) * nr_readers); + tid_writer = malloc(sizeof(*tid_writer) * nr_writers); + count_reader = malloc(sizeof(*count_reader) * nr_readers); + count_writer = malloc(sizeof(*count_writer) * nr_writers); + + printf("Allocating Judy Array for ranges\n"); + test_ja = cds_ja_range_new(); + if (!test_ja) { + printf("Error allocating judy array.\n"); + ret = -1; + goto end; + } + + do_mt_populate_ja(); + + next_aff = 0; + + for (i = 0; i < nr_readers; i++) { + err = pthread_create(&tid_reader[i], + NULL, test_ja_rw_thr_reader, + &count_reader[i]); + if (err != 0) + exit(1); + } + for (i = 0; i < nr_writers; i++) { + err = pthread_create(&tid_writer[i], + NULL, test_ja_rw_thr_writer, + &count_writer[i]); + if (err != 0) + exit(1); + } + + cmm_smp_mb(); + + test_go = 1; + + rcu_thread_offline_qsbr(); + + remain = duration; + do { + remain = sleep(remain); + } while (remain > 0); + + test_stop = 1; + + for (i = 0; i < nr_readers; i++) { + err = pthread_join(tid_reader[i], &tret); + if (err != 0) + exit(1); + tot_reads += count_reader[i]; + } + for (i = 0; i < nr_writers; i++) { + err = pthread_join(tid_writer[i], &tret); + if (err != 0) + exit(1); + tot_writes += count_writer[i].update_ops; + tot_add += count_writer[i].add; + tot_add_exist += count_writer[i].add_exist; + tot_remove += count_writer[i].remove; + } + rcu_thread_online_qsbr(); + + ret = cds_ja_range_destroy(test_ja, NULL); + if (ret) { + fprintf(stderr, "Error destroying judy array\n"); + goto end; + } + + free(tid_reader); + free(tid_writer); + free(count_reader); + free(count_writer); + ret = 0; +end: + return ret; +} + +int main(int argc, char **argv) +{ + int i, j, a, ret, err; + uint64_t key; + struct sigaction act; + + if (argc < 4) { + show_usage(argc, argv); + return -1; + } + + err = sscanf(argv[1], "%u", &nr_readers); + if (err != 1) { + show_usage(argc, argv); + return -1; + } + + err = sscanf(argv[2], "%u", &nr_writers); + if (err != 1) { + show_usage(argc, argv); + return -1; + } + + err = sscanf(argv[3], "%lu", &duration); + if (err != 1) { + show_usage(argc, argv); + return -1; + } + + for (i = 4; 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 'a': + if (argc < i + 2) { + show_usage(argc, argv); + return -1; + } + a = atoi(argv[++i]); + cpu_affinities[next_aff++] = a; + use_affinity = 1; + printf_verbose("Adding CPU %d affinity\n", a); + break; + case 'c': + if (argc < i + 2) { + show_usage(argc, argv); + return -1; + } + rduration = atol(argv[++i]); + break; + case 'd': + if (argc < i + 2) { + show_usage(argc, argv); + return -1; + } + wdelay = atol(argv[++i]); + break; + case 'v': + verbose_mode = 1; + break; + case 'r': + add_ratio = atoi(argv[++i]); + break; + case 'k': + init_populate = 1; + break; + case 'R': + lookup_pool_offset = atol(argv[++i]); + break; + case 'S': + write_pool_offset = atol(argv[++i]); + break; + case 'T': + init_pool_offset = atol(argv[++i]); + break; + case 'M': + lookup_pool_size = atol(argv[++i]); + break; + case 'N': + write_pool_size = atol(argv[++i]); + break; + case 'O': + init_pool_size = atol(argv[++i]); + break; + case 'V': + validate_lookup = 1; + break; + case 't': + sanity_test = 1; + break; + case 'B': + key_bits = atol(argv[++i]); + break; + case 'm': + key_mul = atoll(argv[++i]); + break; + case 'u': + add_unique = 1; + break; + case 's': + add_replace = 1; + break; + case 'l': + leak_detection = 1; + break; + } + } + + printf_verbose("running test for %lu seconds, %u readers, %u writers.\n", + duration, nr_readers, nr_writers); + printf_verbose("Writer delay : %lu loops.\n", wdelay); + printf_verbose("Reader duration : %lu loops.\n", rduration); + printf_verbose("Add ratio: %u%%.\n", add_ratio); + printf_verbose("Mode:%s%s.\n", + " add/remove", + add_unique ? " uniquify" : ( add_replace ? " replace" : " insert")); + printf_verbose("Key multiplication factor: %" PRIu64 ".\n", key_mul); + printf_verbose("Init pool size offset %lu size %lu.\n", + init_pool_offset, init_pool_size); + printf_verbose("Lookup pool size offset %lu size %lu.\n", + lookup_pool_offset, lookup_pool_size); + printf_verbose("Update pool size offset %lu size %lu.\n", + write_pool_offset, write_pool_size); + if (validate_lookup) + printf_verbose("Validating lookups.\n"); + if (leak_detection) + printf_verbose("Memory leak dection activated.\n"); + printf_verbose("thread %-6s, thread id : %lx, tid %lu\n", + "main", pthread_self(), (unsigned long)gettid()); + + memset(&act, 0, sizeof(act)); + ret = sigemptyset(&act.sa_mask); + if (ret == -1) { + perror("sigemptyset"); + return -1; + } + act.sa_handler = test_ja_rw_sigusr1_handler; + act.sa_flags = SA_RESTART; + ret = sigaction(SIGUSR1, &act, NULL); + if (ret == -1) { + perror("sigaction"); + return -1; + } + + err = create_all_cpu_call_rcu_data(0); + if (err) { + printf("Per-CPU call_rcu() worker threads unavailable. Using default global worker thread.\n"); + } + + rcu_register_thread(); + + ret = do_mt_test(); + + /* Wait for in-flight call_rcu free to complete for leak detection */ + rcu_barrier(); + + rcu_unregister_thread(); + free_all_cpu_call_rcu_data(); + + if (ret) { + printf("Test ended with error: %d\n", ret); + } + return ret; +} diff --git a/tests/test_urcu_ja_range.h b/tests/test_urcu_ja_range.h new file mode 100644 index 0000000..e9bbdbc --- /dev/null +++ b/tests/test_urcu_ja_range.h @@ -0,0 +1,177 @@ +#ifndef _TEST_URCU_JA_RANGE_H +#define _TEST_URCU_JA_RANGE_H + +/* + * test_urcu_ja.h + * + * Userspace RCU library - test program + * + * Copyright 2009-2012 - Mathieu Desnoyers + * + * 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 "../config.h" +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#ifdef __linux__ +#include +#endif + +#define DEFAULT_RAND_POOL 1000000 + +/* Make this big enough to include the POWER5+ L3 cacheline size of 256B */ +#define CACHE_LINE_SIZE 4096 + +/* hardcoded number of CPUs */ +#define NR_CPUS 16384 + +#ifdef POISON_FREE +#define poison_free(ptr) \ + do { \ + memset(ptr, 0x42, sizeof(*(ptr))); \ + free(ptr); \ + } while (0) +#else +#define poison_free(ptr) free(ptr) +#endif + + + +#if defined(_syscall0) +_syscall0(pid_t, gettid) +#elif defined(__NR_gettid) +static inline pid_t gettid(void) +{ + return syscall(__NR_gettid); +} +#else +#warning "use pid as tid" +static inline pid_t gettid(void) +{ + return getpid(); +} +#endif + +#ifndef DYNAMIC_LINK_TEST +#define _LGPL_SOURCE +#else +#define debug_yield_read() +#endif +#include +#include +#include + +struct wr_count { + unsigned long update_ops; + unsigned long add; + unsigned long add_exist; + unsigned long remove; +}; + +extern DECLARE_URCU_TLS(unsigned int, rand_lookup); +extern DECLARE_URCU_TLS(unsigned long, nr_add); +extern DECLARE_URCU_TLS(unsigned long, nr_addexist); +extern DECLARE_URCU_TLS(unsigned long, nr_del); +extern DECLARE_URCU_TLS(unsigned long, nr_delnoent); +extern DECLARE_URCU_TLS(unsigned long, lookup_fail); +extern DECLARE_URCU_TLS(unsigned long, lookup_ok); + +extern struct cds_ja *test_ja; + +extern volatile int test_go, test_stop; + +extern unsigned long wdelay; + +extern unsigned long duration; + +/* read-side C.S. duration, in loops */ +extern unsigned long rduration; + +extern unsigned long init_populate; +extern int add_only; + +extern unsigned long init_pool_offset, lookup_pool_offset, write_pool_offset; +extern unsigned long init_pool_size, + lookup_pool_size, + write_pool_size; +extern int validate_lookup; + +extern int count_pipe[2]; + +static inline void loop_sleep(unsigned long l) +{ + while(l-- != 0) + caa_cpu_relax(); +} + +extern int verbose_mode; + +#define printf_verbose(fmt, args...) \ + do { \ + if (verbose_mode) \ + printf(fmt, ## args); \ + } while (0) + +extern unsigned int cpu_affinities[NR_CPUS]; +extern unsigned int next_aff; +extern int use_affinity; + +extern pthread_mutex_t affinity_mutex; + +#ifndef HAVE_CPU_SET_T +typedef unsigned long cpu_set_t; +# define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0) +# define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0) +#endif + +void set_affinity(void); + +/* + * returns 0 if test should end. + */ +static inline int test_duration_write(void) +{ + return !test_stop; +} + +static inline int test_duration_read(void) +{ + return !test_stop; +} + +extern DECLARE_URCU_TLS(unsigned long long, nr_writes); +extern DECLARE_URCU_TLS(unsigned long long, nr_reads); + +extern unsigned int nr_readers; +extern unsigned int nr_writers; + +void rcu_copy_mutex_lock(void); +void rcu_copy_mutex_unlock(void); + +#endif /* _TEST_URCU_JA_RANGE_H */