Rewrote the non-trivial functions in arch_ppc.h and arch_x86.h.
Added complete header license declarations. Created LICENSE file to explain the
library licence.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
--- /dev/null
+Userspace RCU library licensing
+Mathieu Desnoyers
+May 10, 2009
+
+The library part is distributed under LGPLv2.1 or later. See lgpl-2.1.txt for
+details. This applies to :
+
+urcu.h
+urcu.c
+urcu-static.h
+arch_x86.h
+arch_ppc.h
+
+LGPL-compatible source code can statically use the library header using :
+
+#define _LGPL_SOURCE
+#include <urcu.h>
+
+Dynamic-only linking with the LGPL library is used if _LGPL_SOURCE is not
+defined. It permits relinking with newer versions of the library, which is
+required by the LGPL license.
+
+Library test code is distributed under the GPLv2 license. See gpl-2.0.txt for
+details. This applies to :
+
+urcutorture.h
+urcutorture.c
+api_x86.h
+api_ppc.h
+test_urcu.c
+test_urcu_yield.c
+test_rwlock_timing.c
clean:
rm -f *.o test_urcu test_urcu_timing test_rwlock_timing urcu-asm.S \
- test_urcu_yield urcutorture urcutorture-yield
+ test_urcu_yield urcutorture urcutorture-yield liburcu.so \
+ test_urcu_dynamic_link
#define _ARCH_PPC_H
/*
- * arch_x86.h: Definitions for the x86 architecture, derived from Linux.
+ * arch_ppc.h: trivial definitions for the powerpc architecture.
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; but only version 2 of the License given
- * that this comes from the Linux kernel.
+ * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
*
- * This program is distributed in the hope that it will be useful,
+ * 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
*
- * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
+ * 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 <compiler.h>
#define CONFIG_HAVE_FENCE 1
#define CONFIG_HAVE_MEM_COHERENCY
+#ifndef BITS_PER_LONG
+#define BITS_PER_LONG (sizeof(unsigned long) * 8)
+#endif
+
#define mb() asm volatile("sync":::"memory")
#define rmb() asm volatile("sync":::"memory")
#define wmb() asm volatile("sync"::: "memory")
#define LWSYNC_ON_SMP "\n\tlwsync\n"
#define ISYNC_ON_SMP "\n\tisync\n"
-#ifndef _INCLUDE_API_H
-
-static __inline__ void atomic_inc(int *v)
-{
- int t;
-
- __asm__ __volatile__(
-"1: lwarx %0,0,%2 # atomic_inc\n\
- addic %0,%0,1\n"
- PPC405_ERR77(0,%2)
-" stwcx. %0,0,%2 \n\
- bne- 1b"
- : "=&r" (t), "+m" (v)
- : "r" (&v)
- : "cc", "xer");
-}
-
-#endif /* #ifndef _INCLUDE_API_H */
-
struct __xchg_dummy {
unsigned long a[100];
};
#ifndef _INCLUDE_API_H
/*
- * Atomic exchange
- *
- * Changes the memory location '*ptr' to be val and returns
- * the previous value stored there.
+ * Exchange the 32-bits value pointed to by p, returns the old value.
+ * Might not work with PPC405 (see err 77).
*/
-static __always_inline unsigned long
-__xchg_u32(volatile void *p, unsigned long val)
+static __always_inline
+unsigned int __xchg_u32(volatile void *p, unsigned int val)
{
- unsigned long prev;
-
- __asm__ __volatile__(
- LWSYNC_ON_SMP
-"1: lwarx %0,0,%2 \n"
- PPC405_ERR77(0,%2)
-" stwcx. %3,0,%2 \n\
- bne- 1b"
- ISYNC_ON_SMP
- : "=&r" (prev), "+m" (*(volatile unsigned int *)p)
- : "r" (p), "r" (val)
- : "cc", "memory");
-
+ unsigned int prev;
+
+ __asm__ __volatile__(LWSYNC_ON_SMP
+ "1:\t" "lwarx %0,0,%2\n"
+ "stwcx. %3,0,%2\n"
+ "bne- 1b"
+ ISYNC_ON_SMP
+ : "=&r" (prev), "+m" (*(volatile unsigned int *)p)
+ : "r" (p), "r" (val)
+ : "cc", "memory");
return prev;
}
+#if (BITS_PER_LONG == 64)
/*
- * This function doesn't exist, so you'll get a linker error
- * if something tries to do an invalid xchg().
+ * Exchange the 64-bits value pointed to by p, returns the old value.
+ * Might not work with PPC405 (see err 77).
*/
-extern void __xchg_called_with_bad_pointer(void);
+static __always_inline
+unsigned long __xchg_u64(volatile void *p, unsigned long val)
+{
+ unsigned long prev;
+
+ __asm__ __volatile__(LWSYNC_ON_SMP
+ "1:\t" "ldarx %0,0,%2\n"
+ "stdcx. %3,0,%2\n"
+ "bne- 1b"
+ ISYNC_ON_SMP
+ : "=&r" (prev), "+m" (*(volatile unsigned long *)p)
+ : "r" (p), "r" (val)
+ : "cc", "memory");
+ return prev;
+}
+#endif
-static __always_inline unsigned long
-__xchg(volatile void *ptr, unsigned long x, unsigned int size)
+static __always_inline
+unsigned long __xchg(volatile void *ptr, unsigned long x, int size)
{
switch (size) {
case 4:
return __xchg_u32(ptr, x);
-#ifdef CONFIG_PPC64
+#if (BITS_PER_LONG == 64)
case 8:
return __xchg_u64(ptr, x);
#endif
}
- __xchg_called_with_bad_pointer();
return x;
}
-#define xchg(ptr,x) \
- ({ \
- __typeof__(*(ptr)) _x_ = (x); \
- (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \
- })
+/*
+ * note : xchg should only be used with pointers to 32 or 64-bits elements.
+ * No build-time check is done on the element size because depending on
+ * non-referenced unexisting symbol at link time to provide an error message
+ * only work when compiling with optimizations.
+ */
+#define xchg(ptr, v) \
+ ((__typeof__(*(ptr)))__xchg((ptr), (unsigned long)(v), sizeof(*(ptr))))
#endif /* #ifndef _INCLUDE_API_H */
-#define mftbl() ({unsigned long rval; \
- asm volatile("mftbl %0" : "=r" (rval)); rval;})
-#define mftbu() ({unsigned long rval; \
- asm volatile("mftbu %0" : "=r" (rval)); rval;})
+#define mftbl() \
+ ({ \
+ unsigned long rval; \
+ asm volatile("mftbl %0" : "=r" (rval)); \
+ rval; \
+ })
+
+#define mftbu() \
+ ({ \
+ unsigned long rval; \
+ asm volatile("mftbu %0" : "=r" (rval)); \
+ rval; \
+ })
typedef unsigned long long cycles_t;
static inline cycles_t get_cycles (void)
{
- long h;
- long l;
+ long h, l;
for (;;) {
h = mftbu();
- smp_mb();
+ barrier();
l = mftbl();
- smp_mb();
+ barrier();
if (mftbu() == h)
- return (((long long)h) << 32) + l;
+ return (((cycles_t) h) << 32) + l;
}
}
#define _ARCH_X86_H
/*
- * arch_x86.h: Definitions for the x86 architecture, derived from Linux.
+ * arch_x86.h: trivial definitions for the x86 architecture.
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; but only version 2 of the License given
- * that this comes from the Linux kernel.
+ * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
*
- * This program is distributed in the hope that it will be useful,
+ * 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
*
- * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
+ * 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 <compiler.h>
#define CONFIG_HAVE_FENCE 1
#define CONFIG_HAVE_MEM_COHERENCY
+#ifndef BITS_PER_LONG
+#define BITS_PER_LONG (sizeof(unsigned long) * 8)
+#endif
+
#ifdef CONFIG_HAVE_FENCE
#define mb() asm volatile("mfence":::"memory")
#define rmb() asm volatile("lfence":::"memory")
rep_nop();
}
-#ifndef _INCLUDE_API_H
+#define xchg(ptr, v) \
+ ((__typeof__(*(ptr)))__xchg((ptr), (unsigned long)(v), sizeof(*(ptr))))
-static inline void atomic_inc(int *v)
-{
- asm volatile("lock; incl %0"
- : "+m" (*v));
-}
-
-#endif /* #ifndef _INCLUDE_API_H */
-
-#define xchg(ptr, v) \
- ((__typeof__(*(ptr)))__xchg((unsigned long)(v), (ptr), sizeof(*(ptr))))
-
-struct __xchg_dummy {
+struct __xchg_ptr_as_array {
unsigned long a[100];
};
-#define __xg(x) ((struct __xchg_dummy *)(x))
+
+#define __xchg_ptr_as_array(x) ((struct __xchg_ptr_as_array *)(x))
/*
- * Note: no "lock" prefix even on SMP: xchg always implies lock anyway
- * Note 2: xchg has side effect, so that attribute volatile is necessary,
- * but generally the primitive is invalid, *ptr is output argument. --ANK
+ * xchg always implies a "lock" prefix, even on UP. See Intel documentation.
+ * volatile attribute is neccessary due to xchg side effect.
+ * *ptr is an output argument.
* x is considered local, ptr is considered remote.
*/
-static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
+static inline unsigned long __xchg(volatile void *ptr, unsigned long x,
int size)
{
switch (size) {
case 1:
asm volatile("xchgb %b0,%1"
: "=q" (x)
- : "m" (*__xg(ptr)), "0" (x)
+ : "m" (*__xchg_ptr_as_array(ptr)), "0" (x)
: "memory");
break;
case 2:
asm volatile("xchgw %w0,%1"
: "=r" (x)
- : "m" (*__xg(ptr)), "0" (x)
+ : "m" (*__xchg_ptr_as_array(ptr)), "0" (x)
: "memory");
break;
case 4:
asm volatile("xchgl %k0,%1"
: "=r" (x)
- : "m" (*__xg(ptr)), "0" (x)
+ : "m" (*__xchg_ptr_as_array(ptr)), "0" (x)
: "memory");
break;
+#if (BITS_PER_LONG == 64)
case 8:
asm volatile("xchgq %0,%1"
: "=r" (x)
- : "m" (*__xg(ptr)), "0" (x)
+ : "m" (*__xchg_ptr_as_array(ptr)), "0" (x)
: "memory");
break;
+#endif
}
smp_wmc();
return x;
}
-
-#define rdtscll(val) do { \
- unsigned int __a,__d; \
- asm volatile("rdtsc" : "=a" (__a), "=d" (__d)); \
- (val) = ((unsigned long long)__a) | (((unsigned long long)__d)<<32); \
-} while(0)
+#define rdtscll(val) \
+ do { \
+ unsigned int __a, __d; \
+ asm volatile("rdtsc" : "=a" (__a), "=d" (__d)); \
+ (val) = ((unsigned long long)__a) \
+ | (((unsigned long long)__d) << 32); \
+ } while(0)
typedef unsigned long long cycles_t;
-static inline cycles_t get_cycles (void)
+static inline cycles_t get_cycles(void)
{
- unsigned long long ret = 0;
+ cycles_t ret = 0;
rdtscll(ret);
return ret;
--- /dev/null
+#ifndef _COMPILER_H
+#define _COMPILER_H
+
+/*
+ * compiler.h
+ *
+ * Compiler definitions.
+ *
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+ *
+ * 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.
+ */
+
+/* The "volatile" is due to gcc bugs */
+#define barrier() __asm__ __volatile__("": : :"memory")
+
+#define likely(x) __builtin_expect(!!(x), 1)
+#define unlikely(x) __builtin_expect(!!(x), 0)
+
+/*
+ * Instruct the compiler to perform only a single access to a variable
+ * (prohibits merging and refetching). The compiler is also forbidden to reorder
+ * successive instances of ACCESS_ONCE(), but only when the compiler is aware of
+ * particular ordering. Compiler ordering can be ensured, for example, by
+ * putting two ACCESS_ONCE() in separate C statements.
+ *
+ * This macro does absolutely -nothing- to prevent the CPU from reordering,
+ * merging, or refetching absolutely anything at any time. Its main intended
+ * use is to mediate communication between process-level code and irq/NMI
+ * handlers, all running on the same CPU.
+ */
+#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
+
+#endif /* _COMPILER_H */
--- /dev/null
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The licenses for most software are designed to take away your
+freedom to share and change it. By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users. This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it. (Some other Free Software Foundation software is covered by
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+
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+ 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
+
+Also add information on how to contact you by electronic and paper mail.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the library, if
+necessary. Here is a sample; alter the names:
+
+ Yoyodyne, Inc., hereby disclaims all copyright interest in the
+ library `Frob' (a library for tweaking knobs) written by James Random Hacker.
+
+ <signature of Ty Coon>, 1 April 1990
+ Ty Coon, President of Vice
+
+That's all there is to it!
+
+
*
* Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
*
- * Distributed under GPLv2
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
*
* Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
*
- * Distributed under GPLv2
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
*
* Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
*
- * Distributed under GPLv2
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
*
* Userspace RCU library
*
- * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+ * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
*
- * Distributed under LGPLv2.1
+ * 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.
*/
*
* Userspace RCU header
*
- * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
- *
- * Credits for Paul E. McKenney <paulmck@linux.vnet.ibm.com>
- * for inspiration coming from the Linux kernel RCU and rcu-preempt.
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+ * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
*
* LGPL-compatible code should include this header with :
*
* #define _LGPL_SOURCE
* #include <urcu.h>
*
- * Distributed under LGPLv2.1
+ * 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.
*/
projects / urcu.git / commitdiff
