Tcl_Alloc returns a pointer to a block of at least size bytes suitably aligned for any use.
Tcl_Free makes the space referred to by ptr available for further allocation.
Tcl_Realloc changes the size of the block pointed to by ptr to size bytes and returns a pointer to the new block. The contents will be unchanged up to the lesser of the new and old sizes. The returned location may be different from ptr.
Tcl_AttemptAlloc and Tcl_AttemptRealloc are identical in function to Tcl_Alloc and Tcl_Realloc, except that Tcl_AttemptAlloc and Tcl_AttemptRealloc will not cause the Tcl interpreter to panic if the memory allocation fails. If the allocation fails, these functions will return NULL. Note that on some platforms, attempting to allocate a block of memory will also cause these functions to return NULL.
The procedures ckalloc, ckfree, ckrealloc, attemptckalloc, and attemptckrealloc are implemented as macros. Normally, they are synonyms for the corresponding procedures documented on this page. When Tcl and all modules calling Tcl are compiled with TCL_MEM_DEBUG defined, however, these macros are redefined to be special debugging versions of of these procedures. To support Tcl's memory debugging within a module, use the macros rather than direct calls to Tcl_Alloc, etc.
Copyright © 1995-1996 Sun Microsystems, Inc. Copyright © 1995-1997 Roger E. Critchlow Jr.