[lttng-ust.git] / include / lttng / core.h

#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; })


/* 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 */

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;
}

#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

#endif /* UST_CORE_H */
Commit	Line	Data
4fbf9cd1 MD	1	#ifndef UST_CORE_H
	2	#define UST_CORE_H
	3
	4	/*
	5	* Copyright (C) 2010 Pierre-Marc Fournier
b5234c06	6	* Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
518d7abb PMF	7	*
	8	* This library is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public
b5234c06 MD	10	* License as published by the Free Software Foundation; version 2.1 of
b5234c06 MD	11	* the License.
518d7abb PMF	12	*
	13	* This library is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public
	19	* License along with this library; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	21	*/
	22
518d7abb	23	#include <sys/types.h>
4318ae1b	24	#include <lttng/config.h>
a6352fd4	25	#include <urcu/arch.h>
b5a3dfa5	26	#include <urcu/compiler.h>
518d7abb	27
518d7abb PMF	28	/* ARRAYS */
	29
	30	#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
	31
	32
	33	/* ALIGNMENT SHORTCUTS */
	34
	35	#include <unistd.h>
	36
	37	#define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
	38	#define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
	39	#define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
	40	#define PAGE_SIZE sysconf(_SC_PAGE_SIZE)
	41	#define PAGE_MASK (~(PAGE_SIZE-1))
	42
	43	/* ERROR OPS */
	44	#define MAX_ERRNO 4095
	45
b5a3dfa5	46	#define IS_ERR_VALUE(x) caa_unlikely((x) >= (unsigned long)-MAX_ERRNO)
518d7abb PMF	47
	48	static inline void *ERR_PTR(long error)
	49	{
	50	return (void *) error;
	51	}
	52
	53	static inline long PTR_ERR(const void *ptr)
	54	{
	55	return (long) ptr;
	56	}
	57
	58	static inline long IS_ERR(const void *ptr)
	59	{
	60	return IS_ERR_VALUE((unsigned long)ptr);
	61	}
	62
	63
	64	/* Min / Max */
	65
	66	#define min_t(type, x, y) ({ \
	67	type __min1 = (x); \
	68	type __min2 = (y); \
	69	__min1 < __min2 ? __min1: __min2; })
	70
	71	#define max_t(type, x, y) ({ \
	72	type __max1 = (x); \
	73	type __max2 = (y); \
	74	__max1 > __max2 ? __max1: __max2; })
	75
	76
518d7abb PMF	77	/* MALLOCATION */
518d7abb PMF	78
14641deb MD	79	#include <stdlib.h>
	80
	81	static inline
	82	void *zmalloc(size_t len)
	83	{
	84	return calloc(1, len);
	85	}
	86
	87	static inline
	88	void *malloc_align(size_t len)
	89	{
	90	return malloc(ALIGN(len, CAA_CACHE_LINE_SIZE));
	91	}
	92
	93	static inline
	94	void *zmalloc_align(size_t len)
	95	{
	96	return calloc(1, ALIGN(len, CAA_CACHE_LINE_SIZE));
	97	}
518d7abb	98
518d7abb PMF	99	/* MATH */
518d7abb PMF	100
518d7abb PMF	101	static inline unsigned int hweight32(unsigned int w)
	102	{
	103	unsigned int res = w - ((w >> 1) & 0x55555555);
	104	res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
	105	res = (res + (res >> 4)) & 0x0F0F0F0F;
	106	res = res + (res >> 8);
	107	return (res + (res >> 16)) & 0x000000FF;
	108	}
	109
14641deb MD	110	#ifndef inline_memcpy
	111	#define inline_memcpy memcpy
	112	#endif
	113
	114	#ifndef __same_type
	115	#define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
	116	#endif
	117
12e81b07	118	#endif /* UST_CORE_H */