The Tor Browser: nsprpub/pr/src/memory/prseg.c@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #include "primpl.h"

     8 #if defined(_PR_PTHREADS)

    10 /*

    11 ** The pthreads version doesn't use these functions.

    12 */

    13 void _PR_InitSegs(void)

    14 {

    15 }

    17 #else /* _PR_PTHREADS */

    19 void _PR_InitSegs(void)

    20 {

    21 	_PR_MD_INIT_SEGS();

    22 }

    24 /*

    25 ** Allocate a memory segment. The size value is rounded up to the native

    26 ** system page size and a page aligned portion of memory is returned.

    27 ** This memory is not part of the malloc heap. If "vaddr" is not NULL

    28 ** then PR tries to allocate the segment at the desired virtual address.

    29 */

    30 PRSegment* _PR_NewSegment(PRUint32 size, void *vaddr)

    31 {

    32     PRSegment *seg;

    34 	/* calloc the data structure for the segment */

    35     seg = PR_NEWZAP(PRSegment);

    37     if (seg) {

    38 	    size = ((size + _pr_pageSize - 1) >> _pr_pageShift) << _pr_pageShift;

    39 		/*

    40 		**	Now, allocate the actual segment memory (or map under some OS)

    41 		**	The OS specific code decides from where or how to allocate memory.

    42 		*/

    43 	    if (_PR_MD_ALLOC_SEGMENT(seg, size, vaddr) != PR_SUCCESS) {

    44 			PR_DELETE(seg);

    45 			return NULL;

    46     	}

    47 	}

    49     return seg;

    50 }

    52 /*

    53 ** Free a memory segment.

    54 */

    55 void _PR_DestroySegment(PRSegment *seg)

    56 {

    57 	_PR_MD_FREE_SEGMENT(seg);

    58     PR_DELETE(seg);

    59 }

    61 #endif /* _PR_PTHREADS */

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