X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=test_rwlock_timing.c;fp=test_rwlock_timing.c;h=065c2d34038498b90152fa1d6377d4cf36006f38;hb=20bf310ac72677961e55867dd64d058f77e0d7e6;hp=0000000000000000000000000000000000000000;hpb=2bc59bd7ce26378150512280b67599f9004732a5;p=urcu.git

diff --git a/test_rwlock_timing.c b/test_rwlock_timing.c
new file mode 100644
index 0000000..065c2d3
--- /dev/null
+++ b/test_rwlock_timing.c
@@ -0,0 +1,163 @@
+/*
+ * test_urcu.c
+ *
+ * Userspace RCU library - test program
+ *
+ * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+ *
+ * Distributed under GPLv2
+ */
+
+#include <stdio.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <assert.h>
+#include <sys/syscall.h>
+#include <pthread.h>
+
+#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
+
+#define rdtscll(val) do { \
+     unsigned int __a,__d; \
+     asm volatile("rdtsc" : "=a" (__a), "=d" (__d)); \
+     (val) = ((unsigned long)__a) | (((unsigned long)__d)<<32); \
+} while(0)
+
+typedef unsigned long long cycles_t;
+
+static inline cycles_t get_cycles (void)
+{
+        unsigned long long ret = 0;
+
+        rdtscll(ret);
+        return ret;
+}
+
+#include "urcu.h"
+
+struct test_array {
+	int a;
+};
+
+pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER;
+
+static struct test_array test_array = { 8 };
+
+#define OUTER_READ_LOOP	200U
+#define INNER_READ_LOOP	100000U
+#define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
+
+#define WRITE_LOOP 2000U
+
+#define NR_READ 10
+#define NR_WRITE 9
+
+static cycles_t reader_time[NR_READ] __attribute__((aligned(128)));
+
+void *thr_reader(void *arg)
+{
+	int i, j;
+	cycles_t time1, time2;
+
+	printf("thread_begin %s, thread id : %lx, tid %lu\n",
+			"reader", pthread_self(), (unsigned long)gettid());
+	sleep(2);
+
+	time1 = get_cycles();
+	for (i = 0; i < OUTER_READ_LOOP; i++) {
+		for (j = 0; j < INNER_READ_LOOP; j++) {
+			pthread_rwlock_rdlock(&lock);
+			assert(test_array.a == 8);
+			pthread_rwlock_unlock(&lock);
+		}
+	}
+	time2 = get_cycles();
+
+	reader_time[(unsigned long)arg] = time2 - time1;
+
+	sleep(2);
+	printf("thread_end %s, thread id : %lx, tid %lu\n",
+			"reader", pthread_self(), (unsigned long)gettid());
+	return ((void*)1);
+
+}
+
+void *thr_writer(void *arg)
+{
+	int i;
+
+	printf("thread_begin %s, thread id : %lx, tid %lu\n",
+			"writer", pthread_self(), (unsigned long)gettid());
+	sleep(2);
+
+	for (i = 0; i < WRITE_LOOP; i++) {
+		pthread_rwlock_wrlock(&lock);
+		test_array.a = 8;
+		pthread_rwlock_unlock(&lock);
+		usleep(1);
+	}
+
+	printf("thread_end %s, thread id : %lx, tid %lu\n",
+			"writer", pthread_self(), (unsigned long)gettid());
+	return ((void*)2);
+}
+
+int main()
+{
+	int err;
+	pthread_t tid_reader[NR_READ], tid_writer[NR_WRITE];
+	void *tret;
+	int i;
+	cycles_t tot_time = 0;
+
+	printf("thread %-6s, thread id : %lx, tid %lu\n",
+			"main", pthread_self(), (unsigned long)gettid());
+
+	for (i = 0; i < NR_READ; i++) {
+		err = pthread_create(&tid_reader[i], NULL, thr_reader,
+				     (void *)(long)i);
+		if (err != 0)
+			exit(1);
+	}
+	for (i = 0; i < NR_WRITE; i++) {
+		err = pthread_create(&tid_writer[i], NULL, thr_writer, NULL);
+		if (err != 0)
+			exit(1);
+	}
+
+	sleep(10);
+
+	for (i = 0; i < NR_READ; i++) {
+		err = pthread_join(tid_reader[i], &tret);
+		if (err != 0)
+			exit(1);
+		tot_time += reader_time[i];
+	}
+	for (i = 0; i < NR_WRITE; i++) {
+		err = pthread_join(tid_writer[i], &tret);
+		if (err != 0)
+			exit(1);
+	}
+	printf("Time per read : %g cycles\n",
+	       (double)tot_time / ((double)NR_READ * (double)READ_LOOP));
+
+	return 0;
+}