--- /dev/null
+#include <stdio.h>
+#include <errno.h>
+#include <pthread.h>
+#include <sys/time.h>
+
+#include "common.h"
+#include "runtime.h"
+#include "struct.h"
+
+#define NUM_ITERATIONS 10000000
+
+static volatile int wait_;
+static long num_threads_;
+static skiplist_t *sl_;
+
+void *worker (void *arg) {
+
+ // Wait for all the worker threads to be ready.
+ SYNC_ADD(&wait_, -1);
+ do {} while (wait_);
+
+ for (int i = 0; i < NUM_ITERATIONS/num_threads_; ++i) {
+ unsigned r = nbd_rand();
+ int key = r & 0xF;
+ if (r & (1 << 8)) {
+ sl_add(sl_, key, 1);
+ } else {
+ sl_remove(sl_, key);
+ }
+
+ rcu_update();
+ }
+
+ return NULL;
+}
+
+int main (int argc, char **argv) {
+ nbd_init();
+ //lwt_set_trace_level("s3");
+
+ char* program_name = argv[0];
+ pthread_t thread[MAX_NUM_THREADS];
+
+ if (argc > 2) {
+ fprintf(stderr, "Usage: %s num_threads\n", program_name);
+ return -1;
+ }
+
+ num_threads_ = 2;
+ if (argc == 2)
+ {
+ errno = 0;
+ num_threads_ = strtol(argv[1], NULL, 10);
+ if (errno) {
+ fprintf(stderr, "%s: Invalid argument for number of threads\n", program_name);
+ return -1;
+ }
+ if (num_threads_ <= 0) {
+ fprintf(stderr, "%s: Number of threads must be at least 1\n", program_name);
+ return -1;
+ }
+ if (num_threads_ > MAX_NUM_THREADS) {
+ fprintf(stderr, "%s: Number of threads cannot be more than %d\n", program_name, MAX_NUM_THREADS);
+ return -1;
+ }
+ }
+
+ sl_ = sl_alloc();
+
+ struct timeval tv1, tv2;
+ gettimeofday(&tv1, NULL);
+
+ wait_ = num_threads_;
+
+ for (int i = 0; i < num_threads_; ++i) {
+ int rc = nbd_thread_create(thread + i, i, worker, (void*)(size_t)i);
+ if (rc != 0) { perror("pthread_create"); return rc; }
+ }
+
+ for (int i = 0; i < num_threads_; ++i) {
+ pthread_join(thread[i], NULL);
+ }
+
+ gettimeofday(&tv2, NULL);
+ int ms = (int)(1000000*(tv2.tv_sec - tv1.tv_sec) + tv2.tv_usec - tv1.tv_usec) / 1000;
+ sl_print(sl_);
+ printf("Th:%ld Time:%dms\n", num_threads_, ms);
+
+ return 0;
+}