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linux munmap: fix comment and simplify memory free. 

Signed-off-by: Andrea Odetti <mariofutire@gmail.com>
This commit is contained in:
Andrea Odetti 2024-04-20 18:28:40 +01:00
parent 664d7c2d86
commit 3a2898f82c
1 changed files with 16 additions and 16 deletions
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32
source/Memory.cpp
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@ -243,6 +243,7 @@ static LPBYTE RWpages[kMaxExMemoryBanks]; // pointers to RW memory banks
static const UINT kNumAnnunciators = 4;
static bool g_Annunciator[kNumAnnunciators] = {};
static const UINT num64KPages = 2; // number of 64K pages used to create hardware circular buffer
#ifdef _MSC_VER
static HANDLE g_hMemImage = NULL; // NB. When not initialised, this handle is NULL (not INVALID_HANDLE_VALUE)
#else
@ -1522,7 +1523,6 @@ static void FreeMemImage(void)
#ifdef _MSC_VER
if (g_hMemImage)
{
const UINT num64KPages = 2;
for (UINT i = 0; i < num64KPages; i++)
UnmapViewOfFile(memimage + i * _6502_MEM_LEN);
@ -1536,13 +1536,8 @@ static void FreeMemImage(void)
#else
if (g_hMemTempFile)
{
const UINT num64KPages = 2;
for (UINT i = 0; i < num64KPages; i++)
{
munmap(memimage + i * _6502_MEM_LEN, _6502_MEM_LEN);
}
// with the following line, SDL_Quit() segfaults ????
// munmap(memimage + num64KPages * _6502_MEM_LEN, _6502_MEM_LEN);
// unmap the whole region, everything inside will be unmapped too
munmap(memimage, num64KPages * _6502_MEM_LEN);
fclose(g_hMemTempFile);
g_hMemTempFile = NULL;
@ -1572,8 +1567,7 @@ static LPBYTE AllocMemImage(void)
do
{
res = false;
const UINT num64KRegions = 2;
const SIZE_T totalVirtualSize = _6502_MEM_LEN * num64KRegions;
const SIZE_T totalVirtualSize = _6502_MEM_LEN * num64KPages;
baseAddr = (LPBYTE)VirtualAlloc(0, totalVirtualSize, MEM_RESERVE, PAGE_NOACCESS);
if (baseAddr == NULL)
break;
@ -1586,7 +1580,7 @@ static LPBYTE AllocMemImage(void)
break;
UINT count = 0;
while (count < num64KRegions)
while (count < num64KPages)
{
// MSDN: "To specify a suggested base address for the view, use the MapViewOfFileEx function. However, this practice is not recommended."
// The OS (ie. another process) may've beaten us to this suggested baseAddr. This is why we retry multiple times.
@ -1595,7 +1589,7 @@ static LPBYTE AllocMemImage(void)
count++;
}
res = (count == num64KRegions);
res = (count == num64KPages);
if (res)
break;
@ -1633,18 +1627,24 @@ static LPBYTE AllocMemImage(void)
const int fd = fileno(g_hMemTempFile);
if (!ftruncate(fd, _6502_MEM_LEN))
{
const UINT num64KPages = 2;
LPBYTE baseAddr = static_cast<LPBYTE>(mmap(NULL, num64KPages * _6502_MEM_LEN, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
if (baseAddr)
{
bool ok = true;
for (UINT i = 0; i < num64KPages; i++)
{
// can this ever fail?
mmap(baseAddr + i * _6502_MEM_LEN , _6502_MEM_LEN, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, fd, 0);
void * target = baseAddr + i * _6502_MEM_LEN;
void * addr = mmap(target, _6502_MEM_LEN, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, fd, 0);
ok = ok && (target == addr);
}
// we could fclose the file here
// but we keep it as a reminder of how to free the memory later
return baseAddr;
if (ok)
{
return baseAddr;
}
// revert to ALIGNED_ALLOC
munmap(baseAddr, num64KPages * _6502_MEM_LEN);
}
}