Messages in this thread | | | Date | Wed, 22 May 2013 11:27:11 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH v4 7/9] liblockdep: Support using LD_PRELOAD |
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On Wed, May 15, 2013 at 11:15:39PM -0400, Sasha Levin wrote: > + > +/* pthread mutex API */ > + > +#ifdef __GLIBC__ > +extern int __pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr); > +extern int __pthread_mutex_lock(pthread_mutex_t *mutex); > +extern int __pthread_mutex_trylock(pthread_mutex_t *mutex); > +extern int __pthread_mutex_unlock(pthread_mutex_t *mutex); > +extern int __pthread_mutex_destroy(pthread_mutex_t *mutex); > +#else > +#define __pthread_mutex_init NULL > +#define __pthread_mutex_lock NULL > +#define __pthread_mutex_trylock NULL > +#define __pthread_mutex_unlock NULL > +#define __pthread_mutex_destroy NULL > +#endif > +static int (*ll_pthread_mutex_init)(pthread_mutex_t *mutex, > + const pthread_mutexattr_t *attr) = __pthread_mutex_init; > +static int (*ll_pthread_mutex_lock)(pthread_mutex_t *mutex) = __pthread_mutex_lock; > +static int (*ll_pthread_mutex_trylock)(pthread_mutex_t *mutex) = __pthread_mutex_trylock; > +static int (*ll_pthread_mutex_unlock)(pthread_mutex_t *mutex) = __pthread_mutex_unlock; > +static int (*ll_pthread_mutex_destroy)(pthread_mutex_t *mutex) = __pthread_mutex_destroy; > + > +/* pthread rwlock API */ > + > +#ifdef __GLIBC__ > +extern int __pthread_rwlock_init(pthread_rwlock_t *rwlock, const pthread_rwlockattr_t *attr); > +extern int __pthread_rwlock_destroy(pthread_rwlock_t *rwlock); > +extern int __pthread_rwlock_wrlock(pthread_rwlock_t *rwlock); > +extern int __pthread_rwlock_trywrlock(pthread_rwlock_t *rwlock); > +extern int __pthread_rwlock_rdlock(pthread_rwlock_t *rwlock); > +extern int __pthread_rwlock_tryrdlock(pthread_rwlock_t *rwlock); > +extern int __pthread_rwlock_unlock(pthread_rwlock_t *rwlock); > +#else > +#define __pthread_rwlock_init NULL > +#define __pthread_rwlock_destroy NULL > +#define __pthread_rwlock_wrlock NULL > +#define __pthread_rwlock_trywrlock NULL > +#define __pthread_rwlock_rdlock NULL > +#define __pthread_rwlock_tryrdlock NULL > +#define __pthread_rwlock_unlock NULL > +#endif > + > +static int (*ll_pthread_rwlock_init)(pthread_rwlock_t *rwlock, > + const pthread_rwlockattr_t *attr) = __pthread_rwlock_init; > +static int (*ll_pthread_rwlock_destroy)(pthread_rwlock_t *rwlock) = __pthread_rwlock_destroy; > +static int (*ll_pthread_rwlock_rdlock)(pthread_rwlock_t *rwlock) = __pthread_rwlock_rdlock; > +static int (*ll_pthread_rwlock_tryrdlock)(pthread_rwlock_t *rwlock) = __pthread_rwlock_tryrdlock; > +static int (*ll_pthread_rwlock_trywrlock)(pthread_rwlock_t *rwlock) = __pthread_rwlock_trywrlock; > +static int (*ll_pthread_rwlock_wrlock)(pthread_rwlock_t *rwlock) = __pthread_rwlock_wrlock; > +static int (*ll_pthread_rwlock_unlock)(pthread_rwlock_t *rwlock) = __pthread_rwlock_unlock; > +
> +__attribute__((constructor)) static void init_preload(void) > +{ > + if (__init_state != done) > + return; > + > +#ifndef __GLIBC__ > + __init_state = prepare; > + > + ll_pthread_mutex_init = dlsym(RTLD_NEXT, "pthread_mutex_init"); > + ll_pthread_mutex_lock = dlsym(RTLD_NEXT, "pthread_mutex_lock"); > + ll_pthread_mutex_trylock = dlsym(RTLD_NEXT, "pthread_mutex_trylock"); > + ll_pthread_mutex_unlock = dlsym(RTLD_NEXT, "pthread_mutex_unlock"); > + ll_pthread_mutex_destroy = dlsym(RTLD_NEXT, "pthread_mutex_destroy"); > + > + ll_pthread_rwlock_init = dlsym(RTLD_NEXT, "pthread_rwlock_init"); > + ll_pthread_rwlock_destroy = dlsym(RTLD_NEXT, "pthread_rwlock_destroy"); > + ll_pthread_rwlock_rdlock = dlsym(RTLD_NEXT, "pthread_rwlock_rdlock"); > + ll_pthread_rwlock_tryrdlock = dlsym(RTLD_NEXT, "pthread_rwlock_tryrdlock"); > + ll_pthread_rwlock_wrlock = dlsym(RTLD_NEXT, "pthread_rwlock_wrlock"); > + ll_pthread_rwlock_trywrlock = dlsym(RTLD_NEXT, "pthread_rwlock_trywrlock"); > + ll_pthread_rwlock_unlock = dlsym(RTLD_NEXT, "pthread_rwlock_unlock"); > +#endif > + > + printf("%p\n", ll_pthread_mutex_trylock);fflush(stdout); > + > + lockdep_init(); > + > + __init_state = done; > +}
I guess that begs the question do we really want to support !glibc?
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