From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed, 26 Jun 2013 21:39:21 +0000 (-0400)
Subject: rcuja: fix randomness seed (per-thread), use u64 keyspace for random range
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=b10c8ba83ff83cc8bed4bd62832020f9572e0e92;p=userspace-rcu.git

rcuja: fix randomness seed (per-thread), use u64 keyspace for random range

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/rcuja/rcuja-range.c b/rcuja/rcuja-range.c
index 7e4585e..26a0c2e 100644
--- a/rcuja/rcuja-range.c
+++ b/rcuja/rcuja-range.c
@@ -276,7 +276,7 @@ int cds_ja_range_add(struct cds_ja *ja,
 	unsigned int nr_ranges, i;
 	int ret;
 
-	if (start > end || end == UINT64_MAX)
+	if (start > end || end == UINT64_MAX || end > ja->key_max)
 		return -EINVAL;
 
 retry:
diff --git a/tests/test_urcu_ja.c b/tests/test_urcu_ja.c
index 8c7e727..22c336b 100644
--- a/tests/test_urcu_ja.c
+++ b/tests/test_urcu_ja.c
@@ -853,6 +853,8 @@ void *test_ja_rw_thr_reader(void *_count)
 	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 			"reader", pthread_self(), (unsigned long) gettid());
 
+	URCU_TLS(rand_lookup) = urcu_get_thread_id() ^ time(NULL);
+
 	set_affinity();
 
 	rcu_register_thread();
@@ -916,6 +918,8 @@ void *test_ja_rw_thr_writer(void *_count)
 	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 			"writer", pthread_self(), (unsigned long) gettid());
 
+	URCU_TLS(rand_lookup) = urcu_get_thread_id() ^ time(NULL);
+
 	set_affinity();
 
 	rcu_register_thread();
diff --git a/tests/test_urcu_ja.h b/tests/test_urcu_ja.h
index 873b493..1dab429 100644
--- a/tests/test_urcu_ja.h
+++ b/tests/test_urcu_ja.h
@@ -38,10 +38,7 @@
 #include <signal.h>
 
 #include <urcu/tls-compat.h>
-
-#ifdef __linux__
-#include <syscall.h>
-#endif
+#include "thread-id.h"
 
 #define DEFAULT_RAND_POOL	1000000
 
@@ -61,23 +58,6 @@
 #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
diff --git a/tests/test_urcu_ja_range.c b/tests/test_urcu_ja_range.c
index 18f36d5..c10becd 100644
--- a/tests/test_urcu_ja_range.c
+++ b/tests/test_urcu_ja_range.c
@@ -200,6 +200,8 @@ void *test_ja_rw_thr_reader(void *_count)
 	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 			"reader", pthread_self(), (unsigned long) gettid());
 
+	URCU_TLS(rand_lookup) = (unsigned int) gettid() ^ time(NULL);
+
 	set_affinity();
 
 	rcu_register_thread();
@@ -212,9 +214,11 @@ void *test_ja_rw_thr_reader(void *_count)
 	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 = (uint64_t) rand_r(&URCU_TLS(rand_lookup));
+		key += (uint64_t) rand_r(&URCU_TLS(rand_lookup)) << 32ULL;
+		key = (key % lookup_pool_size) + lookup_pool_offset;
 		key *= key_mul;
+
 		range = cds_ja_range_lookup(test_ja, key);
 		if (!range) {
 			if (validate_lookup) {
@@ -271,6 +275,8 @@ void *test_ja_rw_thr_writer(void *_count)
 	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 			"writer", pthread_self(), (unsigned long) gettid());
 
+	URCU_TLS(rand_lookup) = (unsigned int) gettid() ^ time(NULL);
+
 	set_affinity();
 
 	rcu_register_thread();
@@ -286,9 +292,14 @@ void *test_ja_rw_thr_writer(void *_count)
 			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 = (uint64_t) rand_r(&URCU_TLS(rand_lookup));
+			start += (uint64_t) rand_r(&URCU_TLS(rand_lookup)) << 32ULL;
+			start = (start % write_pool_size) + write_pool_offset;
+
+			end = (uint64_t) rand_r(&URCU_TLS(rand_lookup));
+			end += (uint64_t) rand_r(&URCU_TLS(rand_lookup)) << 32ULL;
+			end = (end % write_pool_size) + write_pool_offset;
+
 			start *= key_mul;
 			end *= key_mul;
 			if (start > end) {
@@ -316,8 +327,9 @@ void *test_ja_rw_thr_writer(void *_count)
 			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 = (uint64_t) rand_r(&URCU_TLS(rand_lookup));
+			key += (uint64_t) rand_r(&URCU_TLS(rand_lookup)) << 32ULL;
+			key = (key % write_pool_size) + write_pool_offset;
 			key *= key_mul;
 
 			rcu_read_lock();
diff --git a/tests/test_urcu_ja_range.h b/tests/test_urcu_ja_range.h
index e9bbdbc..1f8c2a2 100644
--- a/tests/test_urcu_ja_range.h
+++ b/tests/test_urcu_ja_range.h
@@ -38,10 +38,7 @@
 #include <signal.h>
 
 #include <urcu/tls-compat.h>
-
-#ifdef __linux__
-#include <syscall.h>
-#endif
+#include "thread-id.h"
 
 #define DEFAULT_RAND_POOL	1000000
 
@@ -61,23 +58,6 @@
 #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