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Make MmapPool allocations pure

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This commit is contained in:
Eugen Wissner 2017-07-12 09:30:07 +02:00
parent fc53779d3f
commit 2bd612fd19
1 changed files with 77 additions and 47 deletions
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120
source/tanya/memory/mmappool.d
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@ -18,14 +18,61 @@ import tanya.memory.allocator;
version (Posix)
{
import core.stdc.errno;
import core.sys.posix.sys.mman;
import core.sys.posix.unistd;
extern (C)
private void* mmap(void* addr,
size_t len,
int prot,
int flags,
int fd,
off_t offset) pure nothrow @system @nogc;
extern (C)
private int munmap(void* addr, size_t len) pure nothrow @system @nogc;
private void* mapMemory(const size_t len) pure nothrow @system @nogc
{
void* p = mmap(null,
len,
0x01 | 0x02, // PROT_READ | PROT_WRITE
0x0002 | 0x1000, // MAP_PRIVATE | MAP_ANON
-1,
0);
return p is (cast(void*) -1) ? null : p;
}
private bool unmapMemory(shared void* addr, const size_t len)
pure nothrow @system @nogc
{
return munmap(cast(void*) addr, len) == 0;
}
}
else version (Windows)
{
import core.sys.windows.winbase;
import core.sys.windows.windows;
import core.sys.windows.winbase : GetSystemInfo, SYSTEM_INFO;
extern (Windows)
private void* VirtualAlloc(void*, size_t, uint, uint)
pure nothrow @system @nogc;
extern (Windows)
private int VirtualFree(void* addr, size_t len, uint)
pure nothrow @system @nogc;
private void* mapMemory(const size_t len) pure nothrow @system @nogc
{
return VirtualAlloc(null,
len,
0x00001000, // MEM_COMMIT
0x04); // PAGE_READWRITE
}
private bool unmapMemory(shared void* addr, const size_t len)
pure nothrow @system @nogc
{
return VirtualFree(cast(void*) addr, 0, 0x8000) == 0;
}
}
/**
@ -78,7 +125,7 @@ final class MmapPool : Allocator
*
* Returns: Pointer to the new allocated memory.
*/
void[] allocate(const size_t size) shared nothrow @nogc
void[] allocate(const size_t size) shared pure nothrow @nogc
{
if (size == 0)
{
@ -137,7 +184,7 @@ final class MmapPool : Allocator
*
* Returns: Data the block points to or $(D_KEYWORD null).
*/
private void* findBlock(const ref size_t size) shared nothrow @nogc
private void* findBlock(const ref size_t size) shared pure nothrow @nogc
{
Block block1;
RegionLoop: for (auto r = head; r !is null; r = r.next)
@ -197,7 +244,7 @@ final class MmapPool : Allocator
*
* Returns: Whether the deallocation was successful.
*/
bool deallocate(void[] p) shared nothrow @nogc
bool deallocate(void[] p) shared pure nothrow @nogc
{
if (p.ptr is null)
{
@ -219,14 +266,7 @@ final class MmapPool : Allocator
{
block.region.next.prev = block.region.prev;
}
version (Posix)
{
return munmap(cast(void*) block.region, block.region.size) == 0;
}
version (Windows)
{
return VirtualFree(cast(void*) block.region, 0, MEM_RELEASE) == 0;
}
return unmapMemory(block.region, block.region.size);
}
// Merge blocks if neigbours are free.
if (block.next !is null && block.next.free)
@ -271,7 +311,7 @@ final class MmapPool : Allocator
* Returns: $(D_KEYWORD true) if successful, $(D_KEYWORD false) otherwise.
*/
bool reallocateInPlace(ref void[] p, const size_t size)
shared nothrow @nogc
pure shared nothrow @nogc
{
if (p is null || size == 0)
{
@ -368,7 +408,7 @@ final class MmapPool : Allocator
*
* Returns: Whether the reallocation was successful.
*/
bool reallocate(ref void[] p, const size_t size) shared nothrow @nogc
bool reallocate(ref void[] p, const size_t size) shared pure nothrow @nogc
{
if (size == 0)
{
@ -441,17 +481,17 @@ final class MmapPool : Allocator
// Get system dependend page size.
version (Posix)
{
pageSize = sysconf(_SC_PAGE_SIZE);
if (pageSize < 65536)
pageSize_ = sysconf(_SC_PAGE_SIZE);
if (pageSize_ < 65536)
{
pageSize = pageSize * 65536 / pageSize;
pageSize_ = pageSize_ * 65536 / pageSize_;
}
}
else version (Windows)
{
SYSTEM_INFO si;
GetSystemInfo(&si);
pageSize = si.dwPageSize;
pageSize_ = si.dwPageSize;
}
const instanceSize = addAlignment(__traits(classInstanceSize,
@ -485,37 +525,19 @@ final class MmapPool : Allocator
* Returns: A pointer to the data.
*/
private static void* initializeRegion(const size_t size, ref Region head)
nothrow @nogc
pure nothrow @nogc
{
const regionSize = calculateRegionSize(size);
if (regionSize < size)
{
return null;
}
version (Posix)
{
void* p = mmap(null,
regionSize,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON,
-1,
0);
if (p is MAP_FAILED)
{
return null;
}
}
else version (Windows)
{
void* p = VirtualAlloc(null,
regionSize,
MEM_COMMIT,
PAGE_READWRITE);
void* p = mapMemory(regionSize);
if (p is null)
{
return null;
}
}
Region region = cast(Region) p;
region.blocks = 1;
@ -552,7 +574,7 @@ final class MmapPool : Allocator
return data;
}
private void* initializeRegion(const size_t size) shared nothrow @nogc
private void* initializeRegion(const size_t size) shared pure nothrow @nogc
{
return initializeRegion(size, head);
}
@ -575,7 +597,7 @@ final class MmapPool : Allocator
* Returns: Minimum region size (a multiple of $(D_PSYMBOL pageSize)).
*/
private static size_t calculateRegionSize(const size_t x)
nothrow @safe @nogc
pure nothrow @safe @nogc
{
return (x + RegionEntry.sizeof + BlockEntry.sizeof * 2)
/ pageSize * pageSize + pageSize;
@ -594,10 +616,18 @@ final class MmapPool : Allocator
assert(MmapPool.instance.alignment == MmapPool.alignment_);
}
private static @property size_t pageSize() pure nothrow @trusted @nogc
{
const pageSize = function size_t() nothrow @safe @nogc {
return pageSize_;
};
return (cast(size_t function() pure nothrow @safe @nogc) pageSize)();
}
private enum uint alignment_ = 8;
private shared static MmapPool instance_;
private shared static size_t pageSize;
private shared static size_t pageSize_;
private shared struct RegionEntry
{