X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=include%2Flttng%2Fcore.h;fp=include%2Flttng%2Fcore.h;h=5bd19829e36160b66898dccd4ba2fcdddf7a6047;hb=4318ae1be57eb7983ab4857a7a8eeb4a030a8216;hp=0000000000000000000000000000000000000000;hpb=d4419b81b243bc3a6bdd4a09b3ca2216d044a1c7;p=ust.git

diff --git a/include/lttng/core.h b/include/lttng/core.h
new file mode 100644
index 0000000..5bd1982
--- /dev/null
+++ b/include/lttng/core.h
@@ -0,0 +1,171 @@
+#ifndef UST_CORE_H
+#define UST_CORE_H
+
+/*
+ * Copyright (C) 2010  Pierre-Marc Fournier
+ * Copyright (C) 2011  Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * 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; version 2.1 of
+ * the License.
+ *
+ * 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
+ */
+
+#include <sys/types.h>
+#include <lttng/config.h>
+#include <urcu/arch.h>
+#include <urcu/compiler.h>
+
+/* ARRAYS */
+
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+
+/* ALIGNMENT SHORTCUTS */
+
+#include <unistd.h>
+
+#define ALIGN(x,a)		__ALIGN_MASK(x,(typeof(x))(a)-1)
+#define __ALIGN_MASK(x,mask)	(((x)+(mask))&~(mask))
+#define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
+#define PAGE_SIZE sysconf(_SC_PAGE_SIZE)
+#define PAGE_MASK (~(PAGE_SIZE-1))
+
+/* ERROR OPS */
+#define MAX_ERRNO	4095
+
+#define IS_ERR_VALUE(x) caa_unlikely((x) >= (unsigned long)-MAX_ERRNO)
+
+static inline void *ERR_PTR(long error)
+{
+	return (void *) error;
+}
+
+static inline long PTR_ERR(const void *ptr)
+{
+	return (long) ptr;
+}
+
+static inline long IS_ERR(const void *ptr)
+{
+	return IS_ERR_VALUE((unsigned long)ptr);
+}
+
+
+/* Min / Max */
+
+#define min_t(type, x, y) ({                    \
+	type __min1 = (x);                      \
+	type __min2 = (y);                      \
+	__min1 < __min2 ? __min1: __min2; })
+
+#define max_t(type, x, y) ({                    \
+	type __max1 = (x);                      \
+	type __max2 = (y);                      \
+	__max1 > __max2 ? __max1: __max2; })
+
+
+/* MUTEXES */
+
+#include <pthread.h>
+
+#define DEFINE_MUTEX(m) pthread_mutex_t (m) = PTHREAD_MUTEX_INITIALIZER;
+#define DECLARE_MUTEX(m) extern pthread_mutex_t (m);
+
+/* MALLOCATION */
+
+#include <stdlib.h>
+
+static inline
+void *zmalloc(size_t len)
+{
+	return calloc(1, len);
+}
+
+static inline
+void *malloc_align(size_t len)
+{
+	return malloc(ALIGN(len, CAA_CACHE_LINE_SIZE));
+}
+
+static inline
+void *zmalloc_align(size_t len)
+{
+	return calloc(1, ALIGN(len, CAA_CACHE_LINE_SIZE));
+}
+
+/* MATH */
+
+#include <lttng/processor.h>
+static inline unsigned int hweight32(unsigned int w)
+{
+	unsigned int res = w - ((w >> 1) & 0x55555555);
+	res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
+	res = (res + (res >> 4)) & 0x0F0F0F0F;
+	res = res + (res >> 8);
+	return (res + (res >> 16)) & 0x000000FF;
+}
+
+static __inline__ int get_count_order(unsigned int count)
+{
+	int order;
+	
+	order = fls(count) - 1;
+	if (count & (count - 1))
+		order++;
+	return order;
+}
+
+#define _ust_container_of(ptr, type, member) ({                      \
+        const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
+        (type *)( (char *)__mptr - offsetof(type,member) );})
+
+#ifndef inline_memcpy
+#define inline_memcpy memcpy
+#endif
+
+#ifndef __same_type
+#define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
+#endif
+
+#ifndef UST_VALGRIND
+
+static __inline__ int ust_get_cpu(void)
+{
+	int cpu;
+
+	cpu = sched_getcpu();
+	if (caa_likely(cpu >= 0))
+		return cpu;
+	/*
+	 * If getcpu(2) is not implemented in the Kernel use CPU 0 as fallback.
+	 */
+	return 0;
+}
+
+#else	/* #else #ifndef UST_VALGRIND */
+
+static __inline__ int ust_get_cpu(void)
+{
+	/*
+	 * Valgrind does not support the sched_getcpu() vsyscall.
+	 * It causes it to detect a segfault in the program and stop it.
+	 * So if we want to check libust with valgrind, we have to refrain
+	 * from using this call. TODO: it would probably be better to return
+	 * other values too, to better test it.
+	 */
+	return 0;
+}
+
+#endif	/* #else #ifndef UST_VALGRIND */
+
+#endif /* UST_CORE_H */