diff options
Diffstat (limited to 'runtime/atomic.h')
| -rw-r--r-- | runtime/atomic.h | 194 |
1 files changed, 177 insertions, 17 deletions
diff --git a/runtime/atomic.h b/runtime/atomic.h index d5aaf56b..3e2c0d18 100644 --- a/runtime/atomic.h +++ b/runtime/atomic.h @@ -31,27 +31,42 @@ * A copy of the GPL can be found in the file "COPYING" in this distribution. * A copy of the LGPL can be found in the file "COPYING.LESSER" in this distribution. */ -#include "config.h" /* autotools! */ - #ifndef INCLUDED_ATOMIC_H #define INCLUDED_ATOMIC_H +#include <time.h> +#include "typedefs.h" /* for this release, we disable atomic calls because there seem to be some * portability problems and we can not fix that without destabilizing the build. * They simply came in too late. -- rgerhards, 2008-04-02 */ #ifdef HAVE_ATOMIC_BUILTINS -# define ATOMIC_INC(data) ((void) __sync_fetch_and_add(&(data), 1)) -# define ATOMIC_INC_AND_FETCH(data) __sync_fetch_and_add(&(data), 1) -# define ATOMIC_DEC(data) ((void) __sync_sub_and_fetch(&(data), 1)) -# define ATOMIC_DEC_AND_FETCH(data) __sync_sub_and_fetch(&(data), 1) -# define ATOMIC_FETCH_32BIT(data) ((unsigned) __sync_fetch_and_and(&(data), 0xffffffff)) +# define ATOMIC_SUB(data, val, phlpmut) __sync_fetch_and_sub(data, val) +# define ATOMIC_ADD(data, val) __sync_fetch_and_add(&(data), val) +# define ATOMIC_INC(data, phlpmut) ((void) __sync_fetch_and_add(data, 1)) +# define ATOMIC_INC_AND_FETCH_int(data, phlpmut) __sync_fetch_and_add(data, 1) +# define ATOMIC_INC_AND_FETCH_unsigned(data, phlpmut) __sync_fetch_and_add(data, 1) +# define ATOMIC_DEC(data, phlpmut) ((void) __sync_sub_and_fetch(data, 1)) +# define ATOMIC_DEC_AND_FETCH(data, phlpmut) __sync_sub_and_fetch(data, 1) +# define ATOMIC_FETCH_32BIT(data, phlpmut) ((unsigned) __sync_fetch_and_and(data, 0xffffffff)) # define ATOMIC_STORE_1_TO_32BIT(data) __sync_lock_test_and_set(&(data), 1) -# define ATOMIC_STORE_0_TO_INT(data) __sync_fetch_and_and(&(data), 0) -# define ATOMIC_STORE_1_TO_INT(data) __sync_fetch_and_or(&(data), 1) +# define ATOMIC_STORE_0_TO_INT(data, phlpmut) __sync_fetch_and_and(data, 0) +# define ATOMIC_STORE_1_TO_INT(data, phlpmut) __sync_fetch_and_or(data, 1) # define ATOMIC_STORE_INT_TO_INT(data, val) __sync_fetch_and_or(&(data), (val)) -# define ATOMIC_CAS(data, oldVal, newVal) __sync_bool_compare_and_swap(&(data), (oldVal), (newVal)); -# define ATOMIC_CAS_VAL(data, oldVal, newVal) __sync_val_compare_and_swap(&(data), (oldVal), (newVal)); +# define ATOMIC_CAS(data, oldVal, newVal, phlpmut) __sync_bool_compare_and_swap(data, (oldVal), (newVal)) +# define ATOMIC_CAS_time_t(data, oldVal, newVal, phlpmut) __sync_bool_compare_and_swap(data, (oldVal), (newVal)) +# define ATOMIC_CAS_VAL(data, oldVal, newVal, phlpmut) __sync_val_compare_and_swap(data, (oldVal), (newVal)); + + /* functions below are not needed if we have atomics */ +# define DEF_ATOMIC_HELPER_MUT(x) +# define INIT_ATOMIC_HELPER_MUT(x) +# define DESTROY_ATOMIC_HELPER_MUT(x) + + /* the following operations should preferrably be done atomic, but it is + * not fatal if not -- that means we can live with some missed updates. So be + * sure to use these macros only if that really does not matter! + */ +# define PREFER_ATOMIC_INC(data) ((void) __sync_fetch_and_add(&(data), 1)) #else /* note that we gained parctical proof that theoretical problems DO occur * if we do not properly address them. See this blog post for details: @@ -60,12 +75,157 @@ * simply go ahead and do without them - use mutexes or other things. The * code needs to be checked against all those cases. -- rgerhards, 2009-01-30 */ -# warning "atomic builtins not available, using nul operations - rsyslogd will probably be racy!" -# define ATOMIC_INC(data) (++(data)) -# define ATOMIC_DEC(data) (--(data)) -# define ATOMIC_DEC_AND_FETCH(data) (--(data)) -# define ATOMIC_FETCH_32BIT(data) (data) -# define ATOMIC_STORE_1_TO_32BIT(data) (data) = 1 + #include <pthread.h> +# define ATOMIC_INC(data, phlpmut) { \ + pthread_mutex_lock(phlpmut); \ + ++(*(data)); \ + pthread_mutex_unlock(phlpmut); \ + } + +# define ATOMIC_STORE_0_TO_INT(data, hlpmut) { \ + pthread_mutex_lock(hlpmut); \ + *(data) = 0; \ + pthread_mutex_unlock(hlpmut); \ + } + +# define ATOMIC_STORE_1_TO_INT(data, hlpmut) { \ + pthread_mutex_lock(hlpmut); \ + *(data) = 1; \ + pthread_mutex_unlock(hlpmut); \ + } + + static inline int + ATOMIC_CAS(int *data, int oldVal, int newVal, pthread_mutex_t *phlpmut) { + int bSuccess; + pthread_mutex_lock(phlpmut); + if(*data == oldVal) { + *data = newVal; + bSuccess = 1; + } else { + bSuccess = 0; + } + pthread_mutex_unlock(phlpmut); + return(bSuccess); + } + + static inline int + ATOMIC_CAS_time_t(time_t *data, time_t oldVal, time_t newVal, pthread_mutex_t *phlpmut) { + int bSuccess; + pthread_mutex_lock(phlpmut); + if(*data == oldVal) { + *data = newVal; + bSuccess = 1; + } else { + bSuccess = 0; + } + pthread_mutex_unlock(phlpmut); + return(bSuccess); + } + + + static inline int + ATOMIC_CAS_VAL(int *data, int oldVal, int newVal, pthread_mutex_t *phlpmut) { + int val; + pthread_mutex_lock(phlpmut); + if(*data == oldVal) { + *data = newVal; + } + val = *data; + pthread_mutex_unlock(phlpmut); + return(val); + } + +# define ATOMIC_DEC(data, phlpmut) { \ + pthread_mutex_lock(phlpmut); \ + --(*(data)); \ + pthread_mutex_unlock(phlpmut); \ + } + + static inline int + ATOMIC_INC_AND_FETCH_int(int *data, pthread_mutex_t *phlpmut) { + int val; + pthread_mutex_lock(phlpmut); + val = ++(*data); + pthread_mutex_unlock(phlpmut); + return(val); + } + + static inline unsigned + ATOMIC_INC_AND_FETCH_unsigned(unsigned *data, pthread_mutex_t *phlpmut) { + unsigned val; + pthread_mutex_lock(phlpmut); + val = ++(*data); + pthread_mutex_unlock(phlpmut); + return(val); + } + + static inline int + ATOMIC_DEC_AND_FETCH(int *data, pthread_mutex_t *phlpmut) { + int val; + pthread_mutex_lock(phlpmut); + val = --(*data); + pthread_mutex_unlock(phlpmut); + return(val); + } + + static inline int + ATOMIC_FETCH_32BIT(int *data, pthread_mutex_t *phlpmut) { + int val; + pthread_mutex_lock(phlpmut); + val = (*data); + pthread_mutex_unlock(phlpmut); + return(val); + } + + static inline void + ATOMIC_SUB(int *data, int val, pthread_mutex_t *phlpmut) { + pthread_mutex_lock(phlpmut); + (*data) -= val; + pthread_mutex_unlock(phlpmut); + } +# define DEF_ATOMIC_HELPER_MUT(x) pthread_mutex_t x +# define INIT_ATOMIC_HELPER_MUT(x) pthread_mutex_init(&(x), NULL) +# define DESTROY_ATOMIC_HELPER_MUT(x) pthread_mutex_destroy(&(x)) + +# define PREFER_ATOMIC_INC(data) ((void) ++data) + #endif +/* we need to handle 64bit atomics seperately as some platforms have + * 32 bit atomics, but not 64 biot ones... -- rgerhards, 2010-12-01 + */ +#ifdef HAVE_ATOMIC_BUILTINS_64BIT +# define ATOMIC_INC_uint64(data, phlpmut) ((void) __sync_fetch_and_add(data, 1)) +# define ATOMIC_DEC_unit64(data, phlpmut) ((void) __sync_sub_and_fetch(data, 1)) +# define ATOMIC_INC_AND_FETCH_uint64(data, phlpmut) __sync_fetch_and_add(data, 1) + +# define DEF_ATOMIC_HELPER_MUT64(x) +# define INIT_ATOMIC_HELPER_MUT64(x) +# define DESTROY_ATOMIC_HELPER_MUT64(x) +#else +# define ATOMIC_INC_uint64(data, phlpmut) { \ + pthread_mutex_lock(phlpmut); \ + ++(*(data)); \ + pthread_mutex_unlock(phlpmut); \ + } +# define ATOMIC_DEC_uint64(data, phlpmut) { \ + pthread_mutex_lock(phlpmut); \ + --(*(data)); \ + pthread_mutex_unlock(phlpmut); \ + } + + static inline unsigned + ATOMIC_INC_AND_FETCH_uint64(uint64 *data, pthread_mutex_t *phlpmut) { + uint64 val; + pthread_mutex_lock(phlpmut); + val = ++(*data); + pthread_mutex_unlock(phlpmut); + return(val); + } + +# define DEF_ATOMIC_HELPER_MUT64(x) pthread_mutex_t x +# define INIT_ATOMIC_HELPER_MUT64(x) pthread_mutex_init(&(x), NULL) +# define DESTROY_ATOMIC_HELPER_MUT64(x) pthread_mutex_destroy(&(x)) +#endif /* #ifdef HAVE_ATOMIC_BUILTINS_64BIT */ + #endif /* #ifndef INCLUDED_ATOMIC_H */ |