prseg.c (1473B)
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/. */ 5 6 #include "primpl.h" 7 8 #if defined(_PR_PTHREADS) 9 10 /* 11 ** The pthreads version doesn't use these functions. 12 */ 13 void _PR_InitSegs(void) {} 14 15 #else /* _PR_PTHREADS */ 16 17 void _PR_InitSegs(void) { _PR_MD_INIT_SEGS(); } 18 19 /* 20 ** Allocate a memory segment. The size value is rounded up to the native 21 ** system page size and a page aligned portion of memory is returned. 22 ** This memory is not part of the malloc heap. If "vaddr" is not NULL 23 ** then PR tries to allocate the segment at the desired virtual address. 24 */ 25 PRSegment* _PR_NewSegment(PRUint32 size, void* vaddr) { 26 PRSegment* seg; 27 28 /* calloc the data structure for the segment */ 29 seg = PR_NEWZAP(PRSegment); 30 31 if (seg) { 32 size = ((size + _pr_pageSize - 1) >> _pr_pageShift) << _pr_pageShift; 33 /* 34 ** Now, allocate the actual segment memory (or map under some OS) 35 ** The OS specific code decides from where or how to allocate memory. 36 */ 37 if (_PR_MD_ALLOC_SEGMENT(seg, size, vaddr) != PR_SUCCESS) { 38 PR_DELETE(seg); 39 return NULL; 40 } 41 } 42 43 return seg; 44 } 45 46 /* 47 ** Free a memory segment. 48 */ 49 void _PR_DestroySegment(PRSegment* seg) { 50 _PR_MD_FREE_SEGMENT(seg); 51 PR_DELETE(seg); 52 } 53 54 #endif /* _PR_PTHREADS */