57907e0943
signed values so -1 actually works correctly, and provide a macro for adding an offset to a pointer.
158 lines
3.8 KiB
C
158 lines
3.8 KiB
C
/***********************************************************
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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******************************************************************/
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#ifndef PRIVATES_H
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#define PRIVATES_H 1
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#include "dix.h"
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#include "resource.h"
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/*****************************************************************
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* STUFF FOR PRIVATES
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*****************************************************************/
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typedef void *DevPrivateKey;
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typedef struct _Private {
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DevPrivateKey key;
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pointer value;
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struct _Private *next;
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} PrivateRec;
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/*
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* Request pre-allocated private space for your driver/module.
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* Calling this is not necessary if only a pointer by itself is needed.
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*/
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extern int
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dixRequestPrivate(const DevPrivateKey key, unsigned size);
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/*
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* Allocates a new private and attaches it to an existing object.
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*/
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extern pointer *
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dixAllocatePrivate(PrivateRec **privates, const DevPrivateKey key);
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/*
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* Look up a private pointer.
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*/
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static _X_INLINE pointer
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dixLookupPrivate(PrivateRec **privates, const DevPrivateKey key)
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{
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PrivateRec *rec = *privates;
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pointer *ptr;
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while (rec) {
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if (rec->key == key)
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return rec->value;
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rec = rec->next;
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}
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ptr = dixAllocatePrivate(privates, key);
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return ptr ? *ptr : NULL;
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}
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/*
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* Look up the address of a private pointer.
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*/
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static _X_INLINE pointer *
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dixLookupPrivateAddr(PrivateRec **privates, const DevPrivateKey key)
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{
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PrivateRec *rec = *privates;
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while (rec) {
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if (rec->key == key)
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return &rec->value;
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rec = rec->next;
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}
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return dixAllocatePrivate(privates, key);
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}
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/*
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* Set a private pointer.
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*/
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static _X_INLINE int
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dixSetPrivate(PrivateRec **privates, const DevPrivateKey key, pointer val)
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{
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PrivateRec *rec;
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top:
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rec = *privates;
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while (rec) {
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if (rec->key == key) {
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rec->value = val;
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return TRUE;
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}
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rec = rec->next;
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}
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if (!dixAllocatePrivate(privates, key))
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return FALSE;
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goto top;
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}
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/*
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* Register callbacks to be called on private allocation/freeing.
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* The calldata argument to the callbacks is a PrivateCallbackPtr.
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*/
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typedef struct _PrivateCallback {
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DevPrivateKey key; /* private registration key */
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pointer *value; /* address of private pointer */
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} PrivateCallbackRec;
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extern int
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dixRegisterPrivateInitFunc(const DevPrivateKey key,
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CallbackProcPtr callback, pointer userdata);
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extern int
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dixRegisterPrivateDeleteFunc(const DevPrivateKey key,
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CallbackProcPtr callback, pointer userdata);
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/*
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* Frees private data.
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*/
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extern void
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dixFreePrivates(PrivateRec *privates);
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/*
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* Resets the subsystem, called from the main loop.
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*/
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extern int
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dixResetPrivates(void);
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/*
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* These next two functions are necessary because the position of
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* the devPrivates field varies by structure and calling code might
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* only know the resource type, not the structure definition.
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*/
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/*
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* Looks up the offset where the devPrivates field is located.
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* Returns -1 if no offset has been registered for the resource type.
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*/
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extern int
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dixLookupPrivateOffset(RESTYPE type);
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/*
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* Specifies the offset where the devPrivates field is located.
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* A negative value indicates no devPrivates field is available.
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*/
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extern int
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dixRegisterPrivateOffset(RESTYPE type, int offset);
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/*
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* Convenience macro for adding an offset to an object pointer
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* when making a call to one of the devPrivates functions
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*/
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#define DEVPRIV_AT(ptr, offset) ((PrivateRec **)((char *)ptr + offset))
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#endif /* PRIVATES_H */
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