Tcl_Preserve, Tcl_Release, Tcl_EventuallyFree − avoid freeing storage while it is 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 holding information specific to the widget) must be returned to the storage allocator. However, it is 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 at once.
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 different 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
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.