RTDECL(bool) ASMBitTestAndClear(volatile void *pvBitmap, int32_t iBit) { if (!ASMBitTest(pvBitmap, iBit)) return false; ASMBitClear(pvBitmap, iBit); return true; }
/** * Mark a page as scanned/not scanned * * @note: we always mark it as scanned, even if we haven't completely done so * * @returns VBox status code. * @param pVM Pointer to the VM. * @param pPage GC page address (not necessarily aligned) * @param fScanned Mark as scanned or not scanned * */ VMM_INT_DECL(int) CSAMMarkPage(PVM pVM, RTRCUINTPTR pPage, bool fScanned) { int pgdir, bit; uintptr_t page; #ifdef LOG_ENABLED if (fScanned && !CSAMIsPageScanned(pVM, (RTRCPTR)pPage)) Log(("CSAMMarkPage %RRv\n", pPage)); #endif if (!CSAMIsEnabled(pVM)) return VINF_SUCCESS; Assert(!HMIsEnabled(pVM)); page = (uintptr_t)pPage; pgdir = page >> X86_PAGE_4M_SHIFT; bit = (page & X86_PAGE_4M_OFFSET_MASK) >> X86_PAGE_4K_SHIFT; Assert(pgdir < CSAM_PGDIRBMP_CHUNKS); Assert(bit < PAGE_SIZE); if(!CTXSUFF(pVM->csam.s.pPDBitmap)[pgdir]) { STAM_COUNTER_INC(&pVM->csam.s.StatBitmapAlloc); int rc = MMHyperAlloc(pVM, CSAM_PAGE_BITMAP_SIZE, 0, MM_TAG_CSAM, (void **)&pVM->csam.s.CTXSUFF(pPDBitmap)[pgdir]); if (RT_FAILURE(rc)) { Log(("MMHyperAlloc failed with %Rrc\n", rc)); return rc; } #ifdef IN_RC pVM->csam.s.pPDHCBitmapGC[pgdir] = MMHyperRCToR3(pVM, (RCPTRTYPE(void*))pVM->csam.s.pPDBitmapGC[pgdir]); if (!pVM->csam.s.pPDHCBitmapGC[pgdir]) { Log(("MMHyperHC2GC failed for %RRv\n", pVM->csam.s.pPDBitmapGC[pgdir])); return rc; } #else pVM->csam.s.pPDGCBitmapHC[pgdir] = MMHyperR3ToRC(pVM, pVM->csam.s.pPDBitmapHC[pgdir]); if (!pVM->csam.s.pPDGCBitmapHC[pgdir]) { Log(("MMHyperHC2GC failed for %RHv\n", pVM->csam.s.pPDBitmapHC[pgdir])); return rc; } #endif } if(fScanned) ASMBitSet((void *)pVM->csam.s.CTXSUFF(pPDBitmap)[pgdir], bit); else ASMBitClear((void *)pVM->csam.s.CTXSUFF(pPDBitmap)[pgdir], bit); return VINF_SUCCESS; }
/** * Frees a page from the page pool. * * @param pPool Pointer to the page pool. * @param pv Pointer to the page to free. * I.e. pointer returned by mmR3PagePoolAlloc(). * @thread The Emulation Thread. */ DECLINLINE(void) mmR3PagePoolFree(PMMPAGEPOOL pPool, void *pv) { VM_ASSERT_EMT(pPool->pVM); STAM_COUNTER_INC(&pPool->cFreeCalls); /* * Lookup the virtual address. */ PMMPPLOOKUPHCPTR pLookup = (PMMPPLOOKUPHCPTR)RTAvlPVGetBestFit(&pPool->pLookupVirt, pv, false); if ( !pLookup || (uint8_t *)pv >= (uint8_t *)pLookup->pSubPool->pvPages + (pLookup->pSubPool->cPages << PAGE_SHIFT) ) { STAM_COUNTER_INC(&pPool->cErrors); AssertMsgFailed(("invalid pointer %p\n", pv)); return; } /* * Free the page. */ PMMPAGESUBPOOL pSubPool = pLookup->pSubPool; /* clear bitmap bit */ const unsigned iPage = ((uint8_t *)pv - (uint8_t *)pSubPool->pvPages) >> PAGE_SHIFT; #ifdef USE_INLINE_ASM_BIT_OPS Assert(ASMBitTest(pSubPool->auBitmap, iPage)); ASMBitClear(pSubPool->auBitmap, iPage); #else unsigned iBit = iPage % (sizeof(pSubPool->auBitmap[0]) * 8); unsigned iIndex = iPage / (sizeof(pSubPool->auBitmap[0]) * 8); pSubPool->auBitmap[iIndex] &= ~(1 << iBit); #endif /* update stats. */ pSubPool->cPagesFree++; #ifdef VBOX_WITH_STATISTICS pPool->cFreePages++; #endif if (pSubPool->cPagesFree == 1) { pSubPool->pNextFree = pPool->pHeadFree; pPool->pHeadFree = pSubPool; } }
int main() { /* * Init the runtime and stuff. */ RTTEST hTest; int rc = RTTestInitAndCreate("tstRTBitOperations", &hTest); if (rc) return rc; RTTestBanner(hTest); int i; int j; int k; /* * Tests */ struct TestMap { uint32_t au32[4]; }; #if 0 struct TestMap sTest; struct TestMap *p = &sTest; #else struct TestMap *p = (struct TestMap *)RTTestGuardedAllocTail(hTest, sizeof(*p)); #endif #define DUMP() RTTestPrintf(hTest, RTTESTLVL_INFO, "au32={%08x,%08x,%08x,%08x}", p->au32[0], p->au32[1], p->au32[2], p->au32[3]) #define CHECK(expr) do { if (!(expr)) { RTTestFailed(hTest, "line %d: %s", __LINE__, #expr); DUMP(); } CHECK_GUARD(s); } while (0) #define CHECK_BIT(expr, b1) do { if (!(expr)) { RTTestFailed(hTest, "line %d, b1=%d: %s", __LINE__, b1, #expr); } CHECK_GUARD(s); } while (0) #define CHECK_BIT2(expr, b1, b2) do { if (!(expr)) { RTTestFailed(hTest, "line %d, b1=%d b2=%d: %s", __LINE__, b1, b2, #expr); } CHECK_GUARD(s); } while (0) #define CHECK_BIT3(expr, b1, b2, b3) do { if (!(expr)) { RTTestFailed(hTest, "line %d, b1=%d b2=%d b3=%d: %s", __LINE__, b1, b2, b3, #expr); } CHECK_GUARD(s); } while (0) #define GUARD_MAP(p) do { } while (0) #define CHECK_GUARD(p) do { } while (0) #define MAP_CLEAR(p) do { RT_ZERO(*(p)); GUARD_MAP(p); } while (0) #define MAP_SET(p) do { memset(p, 0xff, sizeof(*(p))); GUARD_MAP(p); } while (0) /* self check. */ MAP_CLEAR(p); CHECK_GUARD(p); /* bit set */ MAP_CLEAR(p); ASMBitSet(&p->au32[0], 0); ASMBitSet(&p->au32[0], 31); ASMBitSet(&p->au32[0], 65); CHECK(p->au32[0] == 0x80000001U); CHECK(p->au32[2] == 0x00000002U); CHECK(ASMBitTestAndSet(&p->au32[0], 0) && p->au32[0] == 0x80000001U); CHECK(!ASMBitTestAndSet(&p->au32[0], 16) && p->au32[0] == 0x80010001U); CHECK(ASMBitTestAndSet(&p->au32[0], 16) && p->au32[0] == 0x80010001U); CHECK(!ASMBitTestAndSet(&p->au32[0], 80) && p->au32[2] == 0x00010002U); MAP_CLEAR(p); ASMAtomicBitSet(&p->au32[0], 0); ASMAtomicBitSet(&p->au32[0], 30); ASMAtomicBitSet(&p->au32[0], 64); CHECK(p->au32[0] == 0x40000001U); CHECK(p->au32[2] == 0x00000001U); CHECK(ASMAtomicBitTestAndSet(&p->au32[0], 0) && p->au32[0] == 0x40000001U); CHECK(!ASMAtomicBitTestAndSet(&p->au32[0], 16) && p->au32[0] == 0x40010001U); CHECK(ASMAtomicBitTestAndSet(&p->au32[0], 16) && p->au32[0] == 0x40010001U); CHECK(!ASMAtomicBitTestAndSet(&p->au32[0], 80) && p->au32[2] == 0x00010001U); /* bit clear */ MAP_SET(p); ASMBitClear(&p->au32[0], 0); ASMBitClear(&p->au32[0], 31); ASMBitClear(&p->au32[0], 65); CHECK(p->au32[0] == ~0x80000001U); CHECK(p->au32[2] == ~0x00000002U); CHECK(!ASMBitTestAndClear(&p->au32[0], 0) && p->au32[0] == ~0x80000001U); CHECK(ASMBitTestAndClear(&p->au32[0], 16) && p->au32[0] == ~0x80010001U); CHECK(!ASMBitTestAndClear(&p->au32[0], 16) && p->au32[0] == ~0x80010001U); CHECK(ASMBitTestAndClear(&p->au32[0], 80) && p->au32[2] == ~0x00010002U); MAP_SET(p); ASMAtomicBitClear(&p->au32[0], 0); ASMAtomicBitClear(&p->au32[0], 30); ASMAtomicBitClear(&p->au32[0], 64); CHECK(p->au32[0] == ~0x40000001U); CHECK(p->au32[2] == ~0x00000001U); CHECK(!ASMAtomicBitTestAndClear(&p->au32[0], 0) && p->au32[0] == ~0x40000001U); CHECK(ASMAtomicBitTestAndClear(&p->au32[0], 16) && p->au32[0] == ~0x40010001U); CHECK(!ASMAtomicBitTestAndClear(&p->au32[0], 16) && p->au32[0] == ~0x40010001U); CHECK(ASMAtomicBitTestAndClear(&p->au32[0], 80) && p->au32[2] == ~0x00010001U); /* toggle */ MAP_SET(p); ASMBitToggle(&p->au32[0], 0); ASMBitToggle(&p->au32[0], 31); ASMBitToggle(&p->au32[0], 65); ASMBitToggle(&p->au32[0], 47); ASMBitToggle(&p->au32[0], 47); CHECK(p->au32[0] == ~0x80000001U); CHECK(p->au32[2] == ~0x00000002U); CHECK(!ASMBitTestAndToggle(&p->au32[0], 0) && p->au32[0] == ~0x80000000U); CHECK(ASMBitTestAndToggle(&p->au32[0], 0) && p->au32[0] == ~0x80000001U); CHECK(ASMBitTestAndToggle(&p->au32[0], 16) && p->au32[0] == ~0x80010001U); CHECK(!ASMBitTestAndToggle(&p->au32[0], 16) && p->au32[0] == ~0x80000001U); CHECK(ASMBitTestAndToggle(&p->au32[0], 80) && p->au32[2] == ~0x00010002U); MAP_SET(p); ASMAtomicBitToggle(&p->au32[0], 0); ASMAtomicBitToggle(&p->au32[0], 30); ASMAtomicBitToggle(&p->au32[0], 64); ASMAtomicBitToggle(&p->au32[0], 47); ASMAtomicBitToggle(&p->au32[0], 47); CHECK(p->au32[0] == ~0x40000001U); CHECK(p->au32[2] == ~0x00000001U); CHECK(!ASMAtomicBitTestAndToggle(&p->au32[0], 0) && p->au32[0] == ~0x40000000U); CHECK(ASMAtomicBitTestAndToggle(&p->au32[0], 0) && p->au32[0] == ~0x40000001U); CHECK(ASMAtomicBitTestAndToggle(&p->au32[0], 16) && p->au32[0] == ~0x40010001U); CHECK(!ASMAtomicBitTestAndToggle(&p->au32[0], 16) && p->au32[0] == ~0x40000001U); CHECK(ASMAtomicBitTestAndToggle(&p->au32[0], 80) && p->au32[2] == ~0x00010001U); /* test bit. */ for (i = 0; i < 128; i++) { MAP_SET(p); CHECK_BIT(ASMBitTest(&p->au32[0], i), i); ASMBitToggle(&p->au32[0], i); CHECK_BIT(!ASMBitTest(&p->au32[0], i), i); CHECK_BIT(!ASMBitTestAndToggle(&p->au32[0], i), i); CHECK_BIT(ASMBitTest(&p->au32[0], i), i); CHECK_BIT(ASMBitTestAndToggle(&p->au32[0], i), i); CHECK_BIT(!ASMBitTest(&p->au32[0], i), i); MAP_SET(p); CHECK_BIT(ASMBitTest(&p->au32[0], i), i); ASMAtomicBitToggle(&p->au32[0], i); CHECK_BIT(!ASMBitTest(&p->au32[0], i), i); CHECK_BIT(!ASMAtomicBitTestAndToggle(&p->au32[0], i), i); CHECK_BIT(ASMBitTest(&p->au32[0], i), i); CHECK_BIT(ASMAtomicBitTestAndToggle(&p->au32[0], i), i); CHECK_BIT(!ASMBitTest(&p->au32[0], i), i); } /* bit searching */ MAP_SET(p); CHECK(ASMBitFirstClear(&p->au32[0], sizeof(p->au32) * 8) == -1); CHECK(ASMBitFirstSet(&p->au32[0], sizeof(p->au32) * 8) == 0); ASMBitClear(&p->au32[0], 1); CHECK(ASMBitFirstClear(&p->au32[0], sizeof(p->au32) * 8) == 1); CHECK(ASMBitFirstSet(&p->au32[0], sizeof(p->au32) * 8) == 0); MAP_SET(p); ASMBitClear(&p->au32[0], 95); CHECK(ASMBitFirstClear(&p->au32[0], sizeof(p->au32) * 8) == 95); CHECK(ASMBitFirstSet(&p->au32[0], sizeof(p->au32) * 8) == 0); MAP_SET(p); ASMBitClear(&p->au32[0], 127); CHECK(ASMBitFirstClear(&p->au32[0], sizeof(p->au32) * 8) == 127); CHECK(ASMBitFirstSet(&p->au32[0], sizeof(p->au32) * 8) == 0); CHECK(ASMBitNextSet(&p->au32[0], sizeof(p->au32) * 8, 0) == 1); CHECK(ASMBitNextSet(&p->au32[0], sizeof(p->au32) * 8, 1) == 2); CHECK(ASMBitNextSet(&p->au32[0], sizeof(p->au32) * 8, 2) == 3); MAP_SET(p); CHECK(ASMBitNextClear(&p->au32[0], sizeof(p->au32) * 8, 0) == -1); ASMBitClear(&p->au32[0], 32); CHECK(ASMBitNextClear(&p->au32[0], sizeof(p->au32) * 8, 32) == -1); ASMBitClear(&p->au32[0], 88); CHECK(ASMBitNextClear(&p->au32[0], sizeof(p->au32) * 8, 57) == 88); MAP_SET(p); ASMBitClear(&p->au32[0], 31); ASMBitClear(&p->au32[0], 57); ASMBitClear(&p->au32[0], 88); ASMBitClear(&p->au32[0], 101); ASMBitClear(&p->au32[0], 126); ASMBitClear(&p->au32[0], 127); CHECK(ASMBitFirstClear(&p->au32[0], sizeof(p->au32) * 8) == 31); CHECK(ASMBitNextClear(&p->au32[0], sizeof(p->au32) * 8, 31) == 57); CHECK(ASMBitNextClear(&p->au32[0], sizeof(p->au32) * 8, 57) == 88); CHECK(ASMBitNextClear(&p->au32[0], sizeof(p->au32) * 8, 88) == 101); CHECK(ASMBitNextClear(&p->au32[0], sizeof(p->au32) * 8, 101) == 126); CHECK(ASMBitNextClear(&p->au32[0], sizeof(p->au32) * 8, 126) == 127); CHECK(ASMBitNextClear(&p->au32[0], sizeof(p->au32) * 8, 127) == -1); CHECK(ASMBitNextSet(&p->au32[0], sizeof(p->au32) * 8, 29) == 30); CHECK(ASMBitNextSet(&p->au32[0], sizeof(p->au32) * 8, 30) == 32); MAP_CLEAR(p); for (i = 1; i < 128; i++) CHECK_BIT(ASMBitNextClear(&p->au32[0], sizeof(p->au32) * 8, i - 1) == i, i); for (i = 0; i < 128; i++) { MAP_SET(p); ASMBitClear(&p->au32[0], i); CHECK_BIT(ASMBitFirstClear(&p->au32[0], sizeof(p->au32) * 8) == i, i); for (j = 0; j < i; j++) CHECK_BIT(ASMBitNextClear(&p->au32[0], sizeof(p->au32) * 8, j) == i, i); for (j = i; j < 128; j++) CHECK_BIT(ASMBitNextClear(&p->au32[0], sizeof(p->au32) * 8, j) == -1, i); } /* clear range. */ MAP_SET(p); ASMBitClearRange(&p->au32, 0, 128); CHECK(!p->au32[0] && !p->au32[1] && !p->au32[2] && !p->au32[3]); for (i = 0; i < 128; i++) { for (j = i + 1; j <= 128; j++) { MAP_SET(p); ASMBitClearRange(&p->au32, i, j); for (k = 0; k < i; k++) CHECK_BIT3(ASMBitTest(&p->au32[0], k), i, j, k); for (k = i; k < j; k++) CHECK_BIT3(!ASMBitTest(&p->au32[0], k), i, j, k); for (k = j; k < 128; k++) CHECK_BIT3(ASMBitTest(&p->au32[0], k), i, j, k); } } /* set range. */ MAP_CLEAR(p); ASMBitSetRange(&p->au32[0], 0, 5); ASMBitSetRange(&p->au32[0], 6, 44); ASMBitSetRange(&p->au32[0], 64, 65); CHECK(p->au32[0] == UINT32_C(0xFFFFFFDF)); CHECK(p->au32[1] == UINT32_C(0x00000FFF)); CHECK(p->au32[2] == UINT32_C(0x00000001)); MAP_CLEAR(p); ASMBitSetRange(&p->au32[0], 0, 1); ASMBitSetRange(&p->au32[0], 62, 63); ASMBitSetRange(&p->au32[0], 63, 64); ASMBitSetRange(&p->au32[0], 127, 128); CHECK(p->au32[0] == UINT32_C(0x00000001) && p->au32[1] == UINT32_C(0xC0000000)); CHECK(p->au32[2] == UINT32_C(0x00000000) && p->au32[3] == UINT32_C(0x80000000)); MAP_CLEAR(p); ASMBitSetRange(&p->au32, 0, 128); CHECK(!~p->au32[0] && !~p->au32[1] && !~p->au32[2] && !~p->au32[3]); for (i = 0; i < 128; i++) { for (j = i + 1; j <= 128; j++) { MAP_CLEAR(p); ASMBitSetRange(&p->au32, i, j); for (k = 0; k < i; k++) CHECK_BIT3(!ASMBitTest(&p->au32[0], k), i, j, k); for (k = i; k < j; k++) CHECK_BIT3(ASMBitTest(&p->au32[0], k), i, j, k); for (k = j; k < 128; k++) CHECK_BIT3(!ASMBitTest(&p->au32[0], k), i, j, k); } } /* searching for set bits. */ MAP_CLEAR(p); CHECK(ASMBitFirstSet(&p->au32[0], sizeof(p->au32) * 8) == -1); ASMBitSet(&p->au32[0], 65); CHECK(ASMBitFirstSet(&p->au32[0], sizeof(p->au32) * 8) == 65); CHECK(ASMBitNextSet(&p->au32[0], sizeof(p->au32) * 8, 65) == -1); for (i = 0; i < 65; i++) CHECK(ASMBitNextSet(&p->au32[0], sizeof(p->au32) * 8, i) == 65); for (i = 65; i < 128; i++) CHECK(ASMBitNextSet(&p->au32[0], sizeof(p->au32) * 8, i) == -1); ASMBitSet(&p->au32[0], 17); CHECK(ASMBitFirstSet(&p->au32[0], sizeof(p->au32) * 8) == 17); CHECK(ASMBitNextSet(&p->au32[0], sizeof(p->au32) * 8, 17) == 65); for (i = 0; i < 16; i++) CHECK(ASMBitNextSet(&p->au32[0], sizeof(p->au32) * 8, i) == 17); for (i = 17; i < 65; i++) CHECK(ASMBitNextSet(&p->au32[0], sizeof(p->au32) * 8, i) == 65); MAP_SET(p); for (i = 1; i < 128; i++) CHECK_BIT(ASMBitNextSet(&p->au32[0], sizeof(p->au32) * 8, i - 1) == i, i); for (i = 0; i < 128; i++) { MAP_CLEAR(p); ASMBitSet(&p->au32[0], i); CHECK_BIT(ASMBitFirstSet(&p->au32[0], sizeof(p->au32) * 8) == i, i); for (j = 0; j < i; j++) CHECK_BIT(ASMBitNextSet(&p->au32[0], sizeof(p->au32) * 8, j) == i, i); for (j = i; j < 128; j++) CHECK_BIT(ASMBitNextSet(&p->au32[0], sizeof(p->au32) * 8, j) == -1, i); } CHECK(ASMBitLastSetU32(0) == 0); CHECK(ASMBitLastSetU32(1) == 1); CHECK(ASMBitLastSetU32(0x80000000) == 32); CHECK(ASMBitLastSetU32(0xffffffff) == 32); CHECK(ASMBitLastSetU32(RT_BIT(23) | RT_BIT(11)) == 24); for (i = 0; i < 32; i++) CHECK(ASMBitLastSetU32(1 << i) == (unsigned)i + 1); CHECK(ASMBitFirstSetU32(0) == 0); CHECK(ASMBitFirstSetU32(1) == 1); CHECK(ASMBitFirstSetU32(0x80000000) == 32); CHECK(ASMBitFirstSetU32(0xffffffff) == 1); CHECK(ASMBitFirstSetU32(RT_BIT(23) | RT_BIT(11)) == 12); for (i = 0; i < 32; i++) CHECK(ASMBitFirstSetU32(1 << i) == (unsigned)i + 1); /* * Special tests. */ test2(hTest); /* * Summary */ return RTTestSummaryAndDestroy(hTest); }
RTDECL(void) ASMAtomicBitClear(volatile void *pvBitmap, int32_t iBit) { ASMBitClear(pvBitmap, iBit); }
/** * Allocates one or more pages off the heap. * * @returns IPRT status code. * @param pHeap The page heap. * @param pv Pointer to what RTHeapPageAlloc returned. * @param cPages The number of pages that was allocated. */ int RTHeapPageFree(PRTHEAPPAGE pHeap, void *pv, size_t cPages) { /* * Validate input. */ if (!pv) return VINF_SUCCESS; AssertPtrReturn(pHeap, VERR_INVALID_HANDLE); AssertReturn(pHeap->u32Magic == RTHEAPPAGE_MAGIC, VERR_INVALID_HANDLE); /* * Grab the lock and look up the page. */ int rc = RTCritSectEnter(&pHeap->CritSect); if (RT_SUCCESS(rc)) { PRTHEAPPAGEBLOCK pBlock = (PRTHEAPPAGEBLOCK)RTAvlrPVRangeGet(&pHeap->BlockTree, pv); if (pBlock) { /* * Validate the specified address range. */ uint32_t const iPage = (uint32_t)(((uintptr_t)pv - (uintptr_t)pBlock->Core.Key) >> PAGE_SHIFT); /* Check the range is within the block. */ bool fOk = iPage + cPages <= RTMEMPAGEPOSIX_BLOCK_PAGE_COUNT; /* Check that it's the start of an allocation. */ fOk = fOk && ASMBitTest(&pBlock->bmFirst[0], iPage); /* Check that the range ends at an allocation boundrary. */ fOk = fOk && ( iPage + cPages == RTMEMPAGEPOSIX_BLOCK_PAGE_COUNT || ASMBitTest(&pBlock->bmFirst[0], iPage + cPages) || !ASMBitTest(&pBlock->bmAlloc[0], iPage + cPages)); /* Check the other pages. */ uint32_t const iLastPage = iPage + cPages - 1; for (uint32_t i = iPage + 1; i < iLastPage && fOk; i++) fOk = ASMBitTest(&pBlock->bmAlloc[0], i) && !ASMBitTest(&pBlock->bmFirst[0], i); if (fOk) { /* * Free the memory. */ ASMBitClearRange(&pBlock->bmAlloc[0], iPage, iPage + cPages); ASMBitClear(&pBlock->bmFirst[0], iPage); pBlock->cFreePages += cPages; pHeap->cFreePages += cPages; pHeap->cFreeCalls++; if (!pHeap->pHint1 || pHeap->pHint1->cFreePages < pBlock->cFreePages) pHeap->pHint1 = pBlock; /* * Shrink the heap. Not very efficient because of the AVL tree. */ if ( pHeap->cFreePages >= RTMEMPAGEPOSIX_BLOCK_PAGE_COUNT * 3 && pHeap->cFreePages >= pHeap->cHeapPages / 2 /* 50% free */ && pHeap->cFreeCalls - pHeap->uLastMinimizeCall > RTMEMPAGEPOSIX_BLOCK_PAGE_COUNT ) { uint32_t cFreePageTarget = pHeap->cHeapPages / 4; /* 25% free */ while (pHeap->cFreePages > cFreePageTarget) { pHeap->uLastMinimizeCall = pHeap->cFreeCalls; pBlock = NULL; RTAvlrPVDoWithAll(&pHeap->BlockTree, false /*fFromLeft*/, rtHeapPageFindUnusedBlockCallback, &pBlock); if (!pBlock) break; void *pv2 = RTAvlrPVRemove(&pHeap->BlockTree, pBlock->Core.Key); Assert(pv2); NOREF(pv2); pHeap->cHeapPages -= RTMEMPAGEPOSIX_BLOCK_PAGE_COUNT; pHeap->cFreePages -= RTMEMPAGEPOSIX_BLOCK_PAGE_COUNT; pHeap->pHint1 = NULL; pHeap->pHint2 = NULL; RTCritSectLeave(&pHeap->CritSect); munmap(pBlock->Core.Key, RTMEMPAGEPOSIX_BLOCK_SIZE); pBlock->Core.Key = pBlock->Core.KeyLast = NULL; pBlock->cFreePages = 0; rtMemBaseFree(pBlock); RTCritSectEnter(&pHeap->CritSect); } } } else rc = VERR_INVALID_POINTER; } else rc = VERR_INVALID_POINTER; RTCritSectLeave(&pHeap->CritSect); }