Tcl_Preserve(3) Tcl Library Procedures Tcl_Preserve(3)
Tcl_Preserve, Tcl_Release, Tcl_EventuallyFree - avoid freeing storage while it's being used
ClientData clientData (in) Token describing structure to be freed or reallocated. Usually a pointer to memory for structure.
Tcl_FreeProc *freeProc (in) Procedure to invoke to free clientData.
These three procedures help implement a simple reference count mechanism for managing storage. They are designed to solve a problem having
to do with widget deletion, but are also useful in many other situations. When a widget is deleted, its widget record (the structure hold-
ing information specific to the widget) must be returned to the storage allocator. However, it's possible that the widget record is in
active use by one of the procedures on the stack at the time of the deletion. This can happen, for example, if the command associated with
a button widget causes the button to be destroyed: an X event causes an event-handling C procedure in the button to be invoked, which in
turn causes the button's associated Tcl command to be executed, which in turn causes the button to be deleted, which in turn causes the
button's widget record to be de-allocated. Unfortunately, when the Tcl command returns, the button's event-handling procedure will need to
reference the button's widget record. Because of this, the widget record must not be freed as part of the deletion, but must be retained
until the event-handling procedure has finished with it. In other situations where the widget is deleted, it may be possible to free the
widget record immediately.
Tcl_Preserve and Tcl_Release implement short-term reference counts for their clientData argument. The clientData argument identifies an
object and usually consists of the address of a structure. The reference counts guarantee that an object will not be freed until each call
to Tcl_Preserve for the object has been matched by calls to Tcl_Release. There may be any number of unmatched Tcl_Preserve calls in effect
Tcl_EventuallyFree is invoked to free up its clientData argument. It checks to see if there are unmatched Tcl_Preserve calls for the
object. If not, then Tcl_EventuallyFree calls freeProc immediately. Otherwise Tcl_EventuallyFree records the fact that clientData needs
eventually to be freed. When all calls to Tcl_Preserve have been matched with calls to Tcl_Release then freeProc will be called by
Tcl_Release to do the cleanup.
All the work of freeing the object is carried out by freeProc. FreeProc must have arguments and result that match the type Tcl_FreeProc:
typedef void Tcl_FreeProc(char *blockPtr);
The blockPtr argument to freeProc will be the same as the clientData argument to Tcl_EventuallyFree. The type of blockPtr (char *) is dif-
ferent than the type of the clientData argument to Tcl_EventuallyFree for historical reasons, but the value is the same.
When the clientData argument to Tcl_EventuallyFree refers to storage allocated and returned by a prior call to Tcl_Alloc, ckalloc, or
another function of the Tcl library, then the freeProc argument should be given the special value of TCL_DYNAMIC.
This mechanism can be used to solve the problem described above by placing Tcl_Preserve and Tcl_Release calls around actions that may cause
undesired storage re-allocation. The mechanism is intended only for short-term use (i.e. while procedures are pending on the stack); it
will not work efficiently as a mechanism for long-term reference counts. The implementation does not depend in any way on the internal
structure of the objects being freed; it keeps the reference counts in a separate structure.
free, reference count, storage
Tcl 7.5 Tcl_Preserve(3)