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author | William Joye <wjoye@cfa.harvard.edu> | 2018-12-25 19:56:49 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2018-12-25 19:56:49 (GMT) |
commit | d5a4b3667e9d26b9c13905ccb51021d13ce87c58 (patch) | |
tree | fc0f3692516c8c3e8090df20223d342a1b64df93 /tcl8.6/doc/Alloc.3 | |
parent | ff51550ee89b473c63df78de6b2a413f21105687 (diff) | |
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update tcl/tk
Diffstat (limited to 'tcl8.6/doc/Alloc.3')
-rw-r--r-- | tcl8.6/doc/Alloc.3 | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/tcl8.6/doc/Alloc.3 b/tcl8.6/doc/Alloc.3 new file mode 100644 index 0000000..8f25c52 --- /dev/null +++ b/tcl8.6/doc/Alloc.3 @@ -0,0 +1,92 @@ +'\" +'\" Copyright (c) 1995-1996 Sun Microsystems, Inc. +'\" +'\" See the file "license.terms" for information on usage and redistribution +'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. +'\" +.TH Tcl_Alloc 3 7.5 Tcl "Tcl Library Procedures" +.so man.macros +.BS +.SH NAME +Tcl_Alloc, Tcl_Free, Tcl_Realloc, Tcl_AttemptAlloc, Tcl_AttemptRealloc, ckalloc, ckfree, ckrealloc, attemptckalloc, attemptckrealloc \- allocate or free heap memory +.SH SYNOPSIS +.nf +\fB#include <tcl.h>\fR +.sp +char * +\fBTcl_Alloc\fR(\fIsize\fR) +.sp +void +\fBTcl_Free\fR(\fIptr\fR) +.sp +char * +\fBTcl_Realloc\fR(\fIptr, size\fR) +.sp +char * +\fBTcl_AttemptAlloc\fR(\fIsize\fR) +.sp +char * +\fBTcl_AttemptRealloc\fR(\fIptr, size\fR) +.sp +char * +\fBckalloc\fR(\fIsize\fR) +.sp +void +\fBckfree\fR(\fIptr\fR) +.sp +char * +\fBckrealloc\fR(\fIptr, size\fR) +.sp +char * +\fBattemptckalloc\fR(\fIsize\fR) +.sp +char * +\fBattemptckrealloc\fR(\fIptr, size\fR) +.SH ARGUMENTS +.AS char *size +.AP "unsigned int" size in +Size in bytes of the memory block to allocate. +.AP char *ptr in +Pointer to memory block to free or realloc. +.BE + +.SH DESCRIPTION +.PP +These procedures provide a platform and compiler independent interface +for memory allocation. Programs that need to transfer ownership of +memory blocks between Tcl and other modules should use these routines +rather than the native \fBmalloc()\fR and \fBfree()\fR routines +provided by the C run-time library. +.PP +\fBTcl_Alloc\fR returns a pointer to a block of at least \fIsize\fR +bytes suitably aligned for any use. +.PP +\fBTcl_Free\fR makes the space referred to by \fIptr\fR available for +further allocation. +.PP +\fBTcl_Realloc\fR changes the size of the block pointed to by +\fIptr\fR to \fIsize\fR 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 \fIptr\fR. If +\fIptr\fR is NULL, this is equivalent to calling \fBTcl_Alloc\fR with +just the \fIsize\fR argument. +.PP +\fBTcl_AttemptAlloc\fR and \fBTcl_AttemptRealloc\fR are identical in +function to \fBTcl_Alloc\fR and \fBTcl_Realloc\fR, except that +\fBTcl_AttemptAlloc\fR and \fBTcl_AttemptRealloc\fR will not cause the Tcl +interpreter to \fBpanic\fR if the memory allocation fails. If the +allocation fails, these functions will return NULL. Note that on some +platforms, but not all, attempting to allocate a zero-sized block of +memory will also cause these functions to return NULL. +.PP +The procedures \fBckalloc\fR, \fBckfree\fR, \fBckrealloc\fR, +\fBattemptckalloc\fR, and \fBattemptckrealloc\fR 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 \fBTCL_MEM_DEBUG\fR defined, however, +these macros are redefined to be special debugging versions +of these procedures. To support Tcl's memory debugging within a +module, use the macros rather than direct calls to \fBTcl_Alloc\fR, etc. + +.SH KEYWORDS +alloc, allocation, free, malloc, memory, realloc, TCL_MEM_DEBUG |