185 lines
4.2 KiB
C
185 lines
4.2 KiB
C
/*
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* Server-side objects
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* These are the server equivalent of K32OBJ
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*
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* Copyright (C) 1998 Alexandre Julliard
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*/
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#include <assert.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include "winerror.h"
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#include "server.h"
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#include "server/thread.h"
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int debug_level = 0;
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struct object_name
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{
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struct object_name *next;
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struct object *obj;
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int len;
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char name[1];
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};
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#define NAME_HASH_SIZE 37
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static struct object_name *names[NAME_HASH_SIZE];
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/*****************************************************************/
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void *mem_alloc( size_t size )
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{
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void *ptr = malloc( size );
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if (ptr) memset( ptr, 0x55, size );
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else if (current) SET_ERROR( ERROR_OUTOFMEMORY );
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return ptr;
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}
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/*****************************************************************/
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static int get_name_hash( const char *name )
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{
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int hash = 0;
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while (*name) hash ^= *name++;
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return hash % NAME_HASH_SIZE;
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}
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static struct object_name *add_name( struct object *obj, const char *name )
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{
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struct object_name *ptr;
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int hash = get_name_hash( name );
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int len = strlen( name );
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if (!(ptr = (struct object_name *)mem_alloc( sizeof(*ptr) + len )))
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return NULL;
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ptr->next = names[hash];
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ptr->obj = obj;
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ptr->len = len;
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strcpy( ptr->name, name );
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names[hash] = ptr;
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return ptr;
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}
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static void free_name( struct object *obj )
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{
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int hash = get_name_hash( obj->name->name );
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struct object_name **pptr = &names[hash];
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while (*pptr && *pptr != obj->name) pptr = &(*pptr)->next;
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assert( *pptr );
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*pptr = (*pptr)->next;
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free( obj->name );
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}
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/* initialize an already allocated object */
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/* return 1 if OK, 0 on error */
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int init_object( struct object *obj, const struct object_ops *ops,
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const char *name )
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{
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obj->refcount = 1;
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obj->ops = ops;
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obj->head = NULL;
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obj->tail = NULL;
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if (!name) obj->name = NULL;
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else if (!(obj->name = add_name( obj, name ))) return 0;
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return 1;
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}
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struct object *create_named_object( const char *name, const struct object_ops *ops, size_t size )
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{
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struct object *obj;
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if ((obj = find_object( name )))
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{
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if (obj->ops == ops)
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{
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SET_ERROR( ERROR_ALREADY_EXISTS );
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return obj;
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}
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SET_ERROR( ERROR_INVALID_HANDLE );
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return NULL;
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}
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if (!(obj = mem_alloc( size ))) return NULL;
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if (!init_object( obj, ops, name ))
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{
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free( obj );
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return NULL;
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}
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CLEAR_ERROR();
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return obj;
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}
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/* grab an object (i.e. increment its refcount) and return the object */
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struct object *grab_object( void *ptr )
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{
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struct object *obj = (struct object *)ptr;
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assert( obj->refcount < INT_MAX );
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obj->refcount++;
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return obj;
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}
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/* release an object (i.e. decrement its refcount) */
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void release_object( void *ptr )
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{
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struct object *obj = (struct object *)ptr;
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assert( obj->refcount );
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if (!--obj->refcount)
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{
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/* if the refcount is 0, nobody can be in the wait queue */
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assert( !obj->head );
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assert( !obj->tail );
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if (obj->name) free_name( obj );
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obj->ops->destroy( obj );
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}
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}
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/* find an object by its name; the refcount is incremented */
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struct object *find_object( const char *name )
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{
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struct object_name *ptr;
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if (!name) return NULL;
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ptr = names[ get_name_hash( name ) ];
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while (ptr && strcmp( ptr->name, name )) ptr = ptr->next;
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if (!ptr) return NULL;
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return grab_object( ptr->obj );
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}
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/* functions for unimplemented object operations */
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int no_add_queue( struct object *obj, struct wait_queue_entry *entry )
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{
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SET_ERROR( ERROR_INVALID_HANDLE );
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return 0;
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}
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int no_satisfied( struct object *obj, struct thread *thread )
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{
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return 0; /* not abandoned */
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}
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int no_read_fd( struct object *obj )
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{
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SET_ERROR( ERROR_INVALID_HANDLE );
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return -1;
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}
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int no_write_fd( struct object *obj )
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{
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SET_ERROR( ERROR_INVALID_HANDLE );
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return -1;
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}
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int no_flush( struct object *obj )
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{
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SET_ERROR( ERROR_INVALID_HANDLE );
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return 0;
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}
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void default_select_event( int fd, int event, void *private )
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{
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struct object *obj = (struct object *)private;
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assert( obj );
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wake_up( obj, 0 );
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}
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