liblockdep: Add public headers for pthread_mutex_t implementation

These headers provide the same API as their pthread mutex
counterparts.

The design here is to allow to easily switch to liblockdep lock
validation just by adding a "liblockdep_" to pthread_mutex_*()
calls, which means that it's easy to integrate liblockdep into
existing codebases.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: torvalds@linux-foundation.org
Link: http://lkml.kernel.org/r/1371163284-6346-4-git-send-email-sasha.levin@oracle.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Sasha Levin 2013-06-13 18:41:18 -04:00 committed by Ingo Molnar
parent 5634bd7d2a
commit 45e6207464
2 changed files with 120 additions and 0 deletions

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#ifndef _LIBLOCKDEP_COMMON_H
#define _LIBLOCKDEP_COMMON_H
#include <pthread.h>
#define NR_LOCKDEP_CACHING_CLASSES 2
#define MAX_LOCKDEP_SUBCLASSES 8UL
#ifndef CALLER_ADDR0
#define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
#endif
#ifndef _RET_IP_
#define _RET_IP_ CALLER_ADDR0
#endif
#ifndef _THIS_IP_
#define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
#endif
struct lockdep_subclass_key {
char __one_byte;
};
struct lock_class_key {
struct lockdep_subclass_key subkeys[MAX_LOCKDEP_SUBCLASSES];
};
struct lockdep_map {
struct lock_class_key *key;
struct lock_class *class_cache[NR_LOCKDEP_CACHING_CLASSES];
const char *name;
#ifdef CONFIG_LOCK_STAT
int cpu;
unsigned long ip;
#endif
};
void lockdep_init_map(struct lockdep_map *lock, const char *name,
struct lock_class_key *key, int subclass);
void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
int trylock, int read, int check,
struct lockdep_map *nest_lock, unsigned long ip);
void lock_release(struct lockdep_map *lock, int nested,
unsigned long ip);
#define STATIC_LOCKDEP_MAP_INIT(_name, _key) \
{ .name = (_name), .key = (void *)(_key), }
#endif

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#ifndef _LIBLOCKDEP_MUTEX_H
#define _LIBLOCKDEP_MUTEX_H
#include <pthread.h>
#include "common.h"
struct liblockdep_pthread_mutex {
pthread_mutex_t mutex;
struct lockdep_map dep_map;
};
typedef struct liblockdep_pthread_mutex liblockdep_pthread_mutex_t;
#define LIBLOCKDEP_PTHREAD_MUTEX_INITIALIZER(mtx) \
(const struct liblockdep_pthread_mutex) { \
.mutex = PTHREAD_MUTEX_INITIALIZER, \
.dep_map = STATIC_LOCKDEP_MAP_INIT(#mtx, &((&(mtx))->dep_map)), \
}
static inline int __mutex_init(liblockdep_pthread_mutex_t *lock,
const char *name,
struct lock_class_key *key,
const pthread_mutexattr_t *__mutexattr)
{
lockdep_init_map(&lock->dep_map, name, key, 0);
return pthread_mutex_init(&lock->mutex, __mutexattr);
}
#define liblockdep_pthread_mutex_init(mutex, mutexattr) \
({ \
static struct lock_class_key __key; \
\
__mutex_init((mutex), #mutex, &__key, (mutexattr)); \
})
static inline int liblockdep_pthread_mutex_lock(liblockdep_pthread_mutex_t *lock)
{
lock_acquire(&lock->dep_map, 0, 0, 0, 2, NULL, (unsigned long)_RET_IP_);
return pthread_mutex_lock(&lock->mutex);
}
static inline int liblockdep_pthread_mutex_unlock(liblockdep_pthread_mutex_t *lock)
{
lock_release(&lock->dep_map, 0, (unsigned long)_RET_IP_);
return pthread_mutex_unlock(&lock->mutex);
}
static inline int liblockdep_pthread_mutex_trylock(liblockdep_pthread_mutex_t *lock)
{
lock_acquire(&lock->dep_map, 0, 1, 0, 2, NULL, (unsigned long)_RET_IP_);
return pthread_mutex_trylock(&lock->mutex) == 0 ? 1 : 0;
}
static inline int liblockdep_pthread_mutex_destroy(liblockdep_pthread_mutex_t *lock)
{
return pthread_mutex_destroy(&lock->mutex);
}
#ifdef __USE_LIBLOCKDEP
#define pthread_mutex_t liblockdep_pthread_mutex_t
#define pthread_mutex_init liblockdep_pthread_mutex_init
#define pthread_mutex_lock liblockdep_pthread_mutex_lock
#define pthread_mutex_unlock liblockdep_pthread_mutex_unlock
#define pthread_mutex_trylock liblockdep_pthread_mutex_trylock
#define pthread_mutex_destroy liblockdep_pthread_mutex_destroy
#endif
#endif