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gc.d
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gc.d
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/*
Garbage collector instance registration and control.
License: Artistic v2
Authors: Richard (Rikki) Andrew Cattermole
Copyright: 2022 Richard Andrew Cattermole
*/
module sidero.base.allocators.gc;
export:
///
alias EnableFunction = extern (C) void function() nothrow pure;
///
alias DisableFunction = extern (C) void function() nothrow pure;
///
alias CollectFunction = extern (C) void function() nothrow pure;
///
alias MinimizeFunction = extern (C) void function() nothrow pure;
///
alias AddRangeFunction = extern (C) void function(const void*, size_t, const TypeInfo ti = null) @nogc nothrow pure;
///
alias RemoveRangeFunction = extern (C) void function(const void*) nothrow @nogc pure;
///
alias RunFinalizersFunction = extern (C) void function(const scope void[]);
///
alias InFinalizerFunction = extern (C) bool function() nothrow @nogc @safe;
///
void enable() @trusted nothrow {
readLockImpl;
scope (exit)
readUnlockImpl;
GCInfo* current = gcInfoLL;
while (current !is null) {
if (current.enable !is null)
current.enable();
current = current.next;
}
}
///
void disable() @trusted nothrow {
readLockImpl;
scope (exit)
readUnlockImpl;
GCInfo* current = gcInfoLL;
while (current !is null) {
if (current.disable !is null)
current.disable();
current = current.next;
}
}
///
void addRange(scope void[] block, TypeInfo ti = null) pure @nogc nothrow {
readLockImpl;
scope (exit)
readUnlockImpl;
addRangeImpl(block, ti);
}
///
void removeRange(scope void[] block) pure @nogc nothrow {
readLockImpl;
scope (exit)
readUnlockImpl;
removeRangeImpl(block);
}
///
void collect() nothrow {
readLockImpl;
scope (exit)
readUnlockImpl;
GCInfo* current = gcInfoLL;
while (current !is null) {
if (current.collect !is null)
current.collect();
current = current.next;
}
}
///
void minimize() nothrow {
readLockImpl;
scope (exit)
readUnlockImpl;
GCInfo* current = gcInfoLL;
while (current !is null) {
if (current.minimize !is null)
current.minimize();
current = current.next;
}
}
///
void runFinalizers(const scope void[] block) {
readLockImpl;
scope (exit)
readUnlockImpl;
GCInfo* current = gcInfoLL;
while (current !is null) {
if (current.runFinalizers !is null)
current.runFinalizers(block);
current = current.next;
}
}
///
bool inFinalizer() pure @nogc nothrow {
readLockImpl;
scope (exit)
readUnlockImpl;
static bool handle() @trusted {
GCInfo* current = gcInfoLL;
while (current !is null) {
if (current.inFinalizer !is null && current.inFinalizer())
return true;
current = current.next;
}
return false;
}
return (cast(bool function()@trusted pure nothrow @nogc)&handle)();
}
///
void registerGC(scope void* key, EnableFunction enable, DisableFunction disable, CollectFunction collect, MinimizeFunction minimize,
AddRangeFunction addRange, RemoveRangeFunction removeRange, RunFinalizersFunction runFinalizers, InFinalizerFunction inFinalizer) nothrow {
rwlock.writeLock;
scope (exit)
rwlock.pureWriteUnlock;
GCInfo* current = gcInfoLL;
GCInfo** parent = &gcInfoLL;
while (current !is null && cast(size_t)current.key < cast(size_t)key) {
parent = ¤t.next;
current = current.next;
}
if (current is null || cast(size_t)current.key != cast(size_t)key) {
void[] block = gcInfoAllocator.allocate(GCInfo.sizeof);
assert(block.length == GCInfo.sizeof);
GCInfo* newNode = cast(GCInfo*)block.ptr;
newNode.next = current;
newNode.key = key;
newNode.count = 0;
current = newNode;
*parent = current;
}
current.count++;
if (current.enable is null)
current.enable = enable;
if (current.disable is null)
current.disable = disable;
if (current.collect is null)
current.collect = collect;
if (current.minimize is null)
current.minimize = minimize;
if (current.addRange is null)
current.addRange = addRange;
if (current.removeRange is null)
current.removeRange = removeRange;
if (current.runFinalizers is null)
current.runFinalizers = runFinalizers;
if (current.inFinalizer is null)
current.inFinalizer = inFinalizer;
}
///
void deregisterGC(scope void* key) nothrow {
rwlock.writeLock;
scope (exit)
rwlock.pureWriteUnlock;
GCInfo* current = gcInfoLL;
GCInfo** parent = &gcInfoLL;
while (current !is null && cast(size_t)current.key < cast(size_t)key) {
parent = ¤t.next;
current = current.next;
}
if (current !is null && cast(size_t)current.key == cast(size_t)key) {
current.count--;
if (current.count == 0) {
*parent = current.next;
gcInfoAllocator.deallocate((cast(void*)current)[0 .. GCInfo.sizeof]);
}
}
}
package(sidero.base.allocators) {
void readLockImpl() @trusted pure @nogc nothrow {
static void handle() @trusted {
rwlock.readLock;
}
(cast(void function()@trusted pure nothrow @nogc)&handle)();
}
void readUnlockImpl() @trusted pure @nogc nothrow {
static void handle() @trusted {
rwlock.pureReadUnlock;
}
(cast(void function()@trusted pure nothrow @nogc)&handle)();
}
void writeLockImpl() @trusted pure @nogc nothrow {
static void handle() @trusted {
rwlock.writeLock;
}
(cast(void function()@trusted pure nothrow @nogc)&handle)();
}
void writeUnlockImpl() @trusted pure @nogc nothrow {
static void handle() @trusted {
rwlock.pureWriteUnlock;
}
(cast(void function()@trusted pure nothrow @nogc)&handle)();
}
void enableImpl() @trusted pure @nogc nothrow {
static void handle() {
GCInfo* current = gcInfoLL;
while (current !is null) {
if (current.enable !is null)
current.enable();
current = current.next;
}
}
(cast(void function()@trusted pure nothrow @nogc)&handle)();
}
void disableImpl() @trusted pure @nogc nothrow {
static void handle() {
GCInfo* current = gcInfoLL;
while (current !is null) {
if (current.disable !is null)
current.disable();
current = current.next;
}
}
(cast(void function()@trusted pure nothrow @nogc)&handle)();
}
void addRangeImpl(scope void[] block, scope TypeInfo ti = null) @trusted pure @nogc nothrow {
import core.stdc.stdio;
assert(block.ptr !is null);
assert(block.length > 0);
static void handle(scope void[] block, scope TypeInfo ti = null) @trusted {
//printf("add %p %iL\n", block.ptr, block.length);
GCInfo* current = gcInfoLL;
while (current !is null) {
//printf("adding %p[[", current.key);
//fflush(stdout);
if (current.addRange !is null)
current.addRange(block.ptr, block.length, ti);
current = current.next;
//printf("]]\n");
//fflush(stdout);
}
}
(cast(void function(scope void[] block, scope TypeInfo ti = null)@trusted pure nothrow @nogc)&handle)(block, ti);
}
void removeRangeImpl(scope void[] block) @trusted pure @nogc nothrow {
import core.stdc.stdio;
assert(block.ptr !is null);
static void handle(scope void[] block) @trusted {
//printf("remove %p %iL\n", block.ptr, block.length);
GCInfo* current = gcInfoLL;
while (current !is null) {
//printf("removeing %p[[", current.key);
//fflush(stdout);
if (current.removeRange !is null)
current.removeRange(block.ptr);
current = current.next;
//printf("]]\n");
//fflush(stdout);
}
}
(cast(void function(scope void[] block)@trusted pure nothrow @nogc)&handle)(block);
}
}
private:
import sidero.base.allocators.predefined;
import sidero.base.synchronization.system.rwmutex;
__gshared {
SystemReaderWriterLock rwlock;
GCInfo* gcInfoLL;
HouseKeepingAllocator!() gcInfoAllocator;
}
struct GCInfo {
GCInfo* next;
void* key;
ptrdiff_t count;
EnableFunction enable;
DisableFunction disable;
CollectFunction collect;
MinimizeFunction minimize;
AddRangeFunction addRange;
RemoveRangeFunction removeRange;
RunFinalizersFunction runFinalizers;
InFinalizerFunction inFinalizer;
}