U0 SysBadFree(I64 *ptr) { Panic("Bad Free:",ptr); } U0 SysBadMAlloc(I64 *ptr) { Panic("Bad MAlloc:",ptr); } U8 *MemPagAlloc(I64 pags,CBlkPool *bp=NULL) {/*Alloc pags from BlkPool. Don't link to task. (Linking to a task means they will be freed when the task dies.) It might give you more than you asked for. Return: NULL if out of memory. */ CMemBlk *res=NULL,*m; I64 i; if (!bp) bp=sys_code_bp; PUSHFD CLI while (LBts(&bp->locked_flags,BPlf_LOCKED)) PAUSE if (pags<MEM_FREE_PAG_HASH_SIZE) { if (res=bp->free_pag_hash[pags]) { bp->free_pag_hash[pags]=res->next; goto at_done; } i=Bsr(MEM_FREE_PAG_HASH_SIZE)+1; } else { //We'll now round-up to a power of two. //There is some overhead on allocations and //we wouldn't want to round to the next //power of two if a power of two was requested. //So we use a little more than a power of two. pags-=MEM_EXTRA_HASH2_PAGS; i=Bsr(pags)+1; pags=1<<i+MEM_EXTRA_HASH2_PAGS; if (res=bp->free_pag_hash2[i]) { bp->free_pag_hash2[i]=res->next; goto at_done; } } m=&bp->mem_free_lst; while (TRUE) { if (!(res=m->next)) { //We're probably out of luck, but lets search for a //freed larger size block... and, screw-it, return the whole thing. do { if (res=bp->free_pag_hash2[++i]) { pags=1<<i+MEM_EXTRA_HASH2_PAGS; bp->free_pag_hash2[i]=res->next; goto at_done; } } while (i<64-MEM_PAG_BITS-1); pags=0; res=NULL; //Out of memory goto at_done2; } if (res->pags<pags) m=res; else { if (res->pags==pags) { m->next=res->next; goto at_done; } else { res->pags-=pags; res(U8 *)+=res->pags<<MEM_PAG_BITS; res->pags=pags; goto at_done; } } } at_done: bp->used_u8s+=res->pags<<MEM_PAG_BITS; at_done2: LBtr(&bp->locked_flags,BPlf_LOCKED); POPFD return res; } U0 MemPagFree(CMemBlk *m,CBlkPool *bp=NULL) {//Return non-task pags to BlkPool. I64 i,pags; if (m) { if (!bp) bp=sys_code_bp; PUSHFD CLI while (LBts(&bp->locked_flags,BPlf_LOCKED)) PAUSE pags=m->pags; m->mb_signature=MBS_UNUSED_SIGNATURE_VAL; bp->used_u8s-=pags<<MEM_PAG_BITS; if (pags<MEM_FREE_PAG_HASH_SIZE) { m->next=bp->free_pag_hash[pags]; bp->free_pag_hash[pags]=m; } else { //We'll now round-up to a power of two. //There is some overhead on allocations and //we wouldn't want to round to the next //power of two if a power of two was requested. //So we use a little more than a power of two. pags-=MEM_EXTRA_HASH2_PAGS; i=Bsr(pags); m->next=bp->free_pag_hash2[i]; bp->free_pag_hash2[i]=m; } LBtr(&bp->locked_flags,BPlf_LOCKED); POPFD } } CMemBlk *MemPagTaskAlloc(I64 pags,CHeapCtrl *hc) {/*hc must be locked. Don't preempt this routine. Currently, this is only called from MAlloc(). Return: NULL if out of memory. */ CMemBlk *res; I64 threshold,cnt,size; CMemUnused *uum,**_uum,**_ptr; if (res=MemPagAlloc(pags,hc->bp)) { QueIns(res,hc->last_mem_blk); res->mb_signature=MBS_USED_SIGNATURE_VAL; hc->alloced_u8s+=res->pags<<MEM_PAG_BITS; //Tidy-up free lst (Move into heap hash) //because if free lst gets long, delay causes crash. threshold=MEM_HEAP_HASH_SIZE>>4; #assert MEM_HEAP_HASH_SIZE>>4>=sizeof(U8 *) do { cnt=0; _uum=&hc->malloc_free_lst; while (uum=*_uum) { #assert !offset(CMemUnused.next) size=uum->size; if (size<threshold) { *_uum=uum->next; _ptr=(&hc->heap_hash)(U8 *)+size; uum->next=*_ptr; *_ptr=uum; } else { cnt++; _uum=uum; } } threshold<<=1; } while (cnt>8 && threshold<=MEM_HEAP_HASH_SIZE); } return res; } U0 MemPagTaskFree(CMemBlk *m,CHeapCtrl *hc) {//hc must be locked if (m) { PUSHFD CLI if (m->mb_signature!=MBS_USED_SIGNATURE_VAL) SysBadFree(m); else { QueRem(m); hc->alloced_u8s-=m->pags<<MEM_PAG_BITS; MemPagFree(m,hc->bp); } POPFD } }