标签:style class blog code http tar
1 void *zmalloc(size_t size); 2 void *zcalloc(size_t size); 3 void *zrealloc(void *ptr, size_t size); 4 void zfree(void *ptr); 5 char *zstrdup(const char *s); 6 size_t zmalloc_used_memory(void); 7 void zmalloc_enable_thread_safeness(void); 8 float zmalloc_get_fragmentation_ratio(void); 9 size_t zmalloc_get_rss(void); 10 size_t zmalloc_allocations_for_size(size_t size); 11 12 #define ZMALLOC_MAX_ALLOC_STAT 256
1 #ifdef HAVE_MALLOC_SIZE 2 #define PREFIX_SIZE (0) 3 #else 4 #if defined(__sun) 5 #define PREFIX_SIZE (sizeof(long long)) 6 #else 7 #define PREFIX_SIZE (sizeof(size_t)) 8 #endif 9 #endif
1 /* Use tcmalloc‘s malloc_size() when available. 2 * When tcmalloc is used, native OSX malloc_size() may never be used because 3 * this expects a different allocation scheme. Therefore, *exclusively* use 4 * either tcmalloc or OSX‘s malloc_size()! */ 5 #if defined(USE_TCMALLOC) 6 #include <google/tcmalloc.h> 7 #if TC_VERSION_MAJOR >= 1 && TC_VERSION_MINOR >= 6 8 #define HAVE_MALLOC_SIZE 1 9 #define redis_malloc_size(p) tc_malloc_size(p) 10 #endif 11 #elif defined(__APPLE__) 12 #include <malloc/malloc.h> 13 #define HAVE_MALLOC_SIZE 1 14 #define redis_malloc_size(p) malloc_size(p) 15 #endif
如果没有malloc_size函数,那么在Solaris系统上,用long long类型的长度来定义PREFIX_SIZE,其他系统为size_t的长度。
接着,定义下面这些宏。这些宏的作用是如果使用tcmalloc库,那么将库中的分配函数对应到标准库上。后面的函数可直接使用标准库函数的名称。在更换库的时候不需要更改。1 /* Explicitly override malloc/free etc when using tcmalloc. */ 2 #if defined(USE_TCMALLOC) 3 #define malloc(size) tc_malloc(size) 4 #define calloc(count,size) tc_calloc(count,size) 5 #define realloc(ptr,size) tc_realloc(ptr,size) 6 #define free(ptr) tc_free(ptr) 7 #endif 下面的两个宏用于更新zmalloc_allocations数组。update_zmalloc_stat_alloc用于在分配内存的时候更新已分配大小,update_zmalloc_stat_free用于在释放内存的时候删除对应的记录。 1 #define update_zmalloc_stat_alloc(__n,__size) do { 2 size_t _n = (__n); 3 size_t _stat_slot = (__size < ZMALLOC_MAX_ALLOC_STAT) ? __size : ZMALLOC_MAX_ALLOC_STAT; 4 if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); 5 if (zmalloc_thread_safe) { 6 pthread_mutex_lock(&used_memory_mutex); 7 used_memory += _n; 8 zmalloc_allocations[_stat_slot]++; 9 pthread_mutex_unlock(&used_memory_mutex); 10 } else { 11 used_memory += _n; 12 zmalloc_allocations[_stat_slot]++; 13 } 14 } while(0)
1 #define update_zmalloc_stat_free(__n) do { 2 size_t _n = (__n); 3 if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); 4 if (zmalloc_thread_safe) { 5 pthread_mutex_lock(&used_memory_mutex); 6 used_memory -= _n; 7 pthread_mutex_unlock(&used_memory_mutex); 8 } else { 9 used_memory -= _n; 10 } 11 } while(0)
#define update_zmalloc_stat_alloc(__n) do { \ size_t _n = (__n); if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); if (zmalloc_thread_safe) { update_zmalloc_stat_add(_n); } else { used_memory += _n; } } while(0)
标签:style class blog code http tar
原文地址:http://www.cnblogs.com/loujiayu/p/3805889.html