#include <db.h> int DB_ENV->mutex_stat(DB_ENV *env, DB_MUTEX_STAT **statp, u_int32_t flags);
         The DB_ENV->mutex_stat() method returns the mutex subsystem
         statistics.
    
         The DB_ENV->mutex_stat() method creates a statistical structure of
         type DB_MUTEX_STAT and copies a pointer to it into a user-specified
         memory location.
    
Statistical structures are stored in allocated memory. If application-specific allocation routines have been declared (see DB_ENV->set_alloc() for more information), they are used to allocate the memory; otherwise, the standard C library malloc(3) is used. The caller is responsible for deallocating the memory. To deallocate the memory, free the memory reference; references inside the returned memory need not be individually freed.
         The following DB_MUTEX_STAT fields will be filled in:
    
u_int32_t st_mutex_align;
The mutex alignment, in bytes.
int st_mutex_cnt;
The total number of mutexes configured.
u_int32_t st_mutex_free;
The number of mutexes currently available.
u_int32_t st_mutex_init;
The initial number of mutexes configured.
u_int32_t st_mutex_inuse;
The number of mutexes currently in use.
u_int32_t st_mutex_inuse_max;
The maximum number of mutexes ever in use.
u_int32_t st_mutex_max;
The maximum number of mutexes.
u_int32_t st_mutex_tas_spins;
The number of times test-and-set mutexes will spin without blocking.
uintmax_t st_region_wait;
The number of times that a thread of control was forced to wait before obtaining the mutex region mutex.
uintmax_t st_region_nowait;
The number of times that a thread of control was able to obtain the mutex region mutex without waiting.
roff_t st_regmax;
The max size of the mutex region size.
roff_t st_regsize;
The size of the mutex region, in bytes.
              The DB_ENV->mutex_stat() method may not be called before the 
              DB_ENV->open()  method is called.
     
         The DB_ENV->mutex_stat() 
            
                  method returns a non-zero error value on failure and 0 on success.
            
            
        
    
The statp parameter references memory into which a pointer to the allocated statistics structure is copied.
             The DB_ENV->mutex_stat() 
            
                 method may fail and return one of the following non-zero errors: