X-Git-Url: https://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=tests%2Fcommon%2Fdebug-yield.h;fp=tests%2Fcommon%2Fdebug-yield.h;h=c60e4e0eb1c272b9dbf5db9691c7e2fce9cd06d0;hp=0000000000000000000000000000000000000000;hb=2650042a5405028da49bfcfb71053b78a56a9ed4;hpb=6a3d2c224f2f0f0f7f8c852b80e5864b2cab9e1b

diff --git a/tests/common/debug-yield.h b/tests/common/debug-yield.h
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+++ b/tests/common/debug-yield.h
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+#ifndef URCU_TESTS_DEBUG_YIELD_H
+#define URCU_TESTS_DEBUG_YIELD_H
+
+/*
+ * debug-yield.h
+ *
+ * Userspace RCU library tests - Debugging header
+ *
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * IBM's contributions to this file may be relicensed under LGPLv2 or later.
+ */
+
+#include <sched.h>
+#include <time.h>
+#include <pthread.h>
+#include <unistd.h>
+
+#define RCU_YIELD_READ 	(1 << 0)
+#define RCU_YIELD_WRITE	(1 << 1)
+
+/*
+ * Updates with RCU_SIGNAL are much slower. Account this in the delay.
+ */
+#ifdef RCU_SIGNAL
+/* maximum sleep delay, in us */
+#define MAX_SLEEP 30000
+#else
+#define MAX_SLEEP 50
+#endif
+
+extern unsigned int rcu_yield_active;
+extern DECLARE_URCU_TLS(unsigned int, rcu_rand_yield);
+
+#ifdef DEBUG_YIELD
+static inline void rcu_debug_yield_read(void)
+{
+	if (rcu_yield_active & RCU_YIELD_READ)
+		if (rand_r(&URCU_TLS(rcu_rand_yield)) & 0x1)
+			usleep(rand_r(&URCU_TLS(rcu_rand_yield)) % MAX_SLEEP);
+}
+
+static inline void rcu_debug_yield_write(void)
+{
+	if (rcu_yield_active & RCU_YIELD_WRITE)
+		if (rand_r(&URCU_TLS(rcu_rand_yield)) & 0x1)
+			usleep(rand_r(&URCU_TLS(rcu_rand_yield)) % MAX_SLEEP);
+}
+
+static inline void rcu_debug_yield_enable(unsigned int flags)
+{
+	rcu_yield_active |= flags;
+}
+
+static inline void rcu_debug_yield_disable(unsigned int flags)
+{
+	rcu_yield_active &= ~flags;
+}
+
+static inline void rcu_debug_yield_init(void)
+{
+	URCU_TLS(rcu_rand_yield) = time(NULL) ^ (unsigned long) pthread_self();
+}
+#else /* DEBUG_YIELD */
+static inline void rcu_debug_yield_read(void)
+{
+}
+
+static inline void rcu_debug_yield_write(void)
+{
+}
+
+static inline void rcu_debug_yield_enable(unsigned int flags)
+{
+}
+
+static inline void rcu_debug_yield_disable(unsigned int flags)
+{
+}
+
+static inline void rcu_debug_yield_init(void)
+{
+}
+#endif
+
+#endif /* URCU_TESTS_DEBUG_YIELD_H */