X-Git-Url: https://git.llucax.com/software/dgc/cdgc.git/blobdiff_plain/67f00b96c70725ee445641a158a97fe4f6e735d3..b5e1601adc7b579e9d2366aa2529b07ee6f47fe3:/rt/gc/cdgc/gc.d

diff --git a/rt/gc/cdgc/gc.d b/rt/gc/cdgc/gc.d
index dbcd518..267b42f 100644
--- a/rt/gc/cdgc/gc.d
+++ b/rt/gc/cdgc/gc.d
@@ -99,32 +99,29 @@ package bool has_pointermap(uint attrs)
 
 private
 {
-
-    extern (C) void* rt_stackBottom();
-    extern (C) void* rt_stackTop();
-
-    extern (C) void rt_finalize( void* p, bool det = true );
-
     alias void delegate(Object) DEvent;
-    extern (C) void rt_attachDisposeEvent(Object h, DEvent e);
-    extern (C) bool rt_detachDisposeEvent(Object h, DEvent e);
-
-
     alias void delegate( void*, void* ) scanFn;
+    enum { OPFAIL = ~cast(size_t)0 }
 
-    extern (C) void rt_scanStaticData( scanFn scan );
-
-    extern (C) bool thread_needLock();
-    extern (C) void thread_suspendAll();
-    extern (C) void thread_resumeAll();
+    extern (C)
+    {
+        version (DigitalMars) version(OSX)
+            oid _d_osx_image_init();
 
-    extern (C) void thread_scanAll( scanFn fn, void* curStackTop = null );
+        void* rt_stackBottom();
+        void* rt_stackTop();
+        void rt_finalize( void* p, bool det = true );
+        void rt_attachDisposeEvent(Object h, DEvent e);
+        bool rt_detachDisposeEvent(Object h, DEvent e);
+        void rt_scanStaticData( scanFn scan );
 
-    extern (C) void onOutOfMemoryError();
+        void thread_init();
+        bool thread_needLock();
+        void thread_suspendAll();
+        void thread_resumeAll();
+        void thread_scanAll( scanFn fn, void* curStackTop = null );
 
-    enum
-    {
-        OPFAIL = ~cast(size_t)0
+        void onOutOfMemoryError();
     }
 }
 
@@ -218,6 +215,15 @@ struct GC
     Stats stats;
 }
 
+// call locked if necessary
+private T locked(T, alias Code)()
+{
+    if (thread_needLock())
+        synchronized (gc.lock) return Code();
+    else
+       return Code();
+}
+
 private GC* gc;
 
 bool Invariant()
@@ -283,144 +289,21 @@ Pool *findPool(void *p)
 
 
 /**
- * Find base address of block containing pointer p.
- * Returns null if not a gc'd pointer
- */
-void* findBase(void *p)
-{
-    Pool *pool;
-
-    pool = findPool(p);
-    if (pool)
-    {
-        size_t offset = cast(size_t)(p - pool.baseAddr);
-        size_t pn = offset / PAGESIZE;
-        Bins   bin = cast(Bins)pool.pagetable[pn];
-
-        // Adjust bit to be at start of allocated memory block
-        if (bin <= B_PAGE)
-        {
-            return pool.baseAddr + (offset & notbinsize[bin]);
-        }
-        else if (bin == B_PAGEPLUS)
-        {
-            do
-            {
-                --pn, offset -= PAGESIZE;
-            } while (cast(Bins)pool.pagetable[pn] == B_PAGEPLUS);
-
-            return pool.baseAddr + (offset & (offset.max ^ (PAGESIZE-1)));
-        }
-        else
-        {
-            // we are in a B_FREE page
-            return null;
-        }
-    }
-    return null;
-}
-
-
-/**
- * Find size of pointer p.
- * Returns 0 if not a gc'd pointer
- */
-size_t findSize(void *p)
-{
-    Pool*  pool;
-    size_t size = 0;
-
-    pool = findPool(p);
-    if (pool)
-    {
-        size_t pagenum;
-        Bins   bin;
-
-        pagenum = cast(size_t)(p - pool.baseAddr) / PAGESIZE;
-        bin = cast(Bins)pool.pagetable[pagenum];
-        size = binsize[bin];
-        if (bin == B_PAGE)
-        {
-            ubyte* pt;
-            size_t i;
-
-            pt = &pool.pagetable[0];
-            for (i = pagenum + 1; i < pool.npages; i++)
-            {
-                if (pt[i] != B_PAGEPLUS)
-                    break;
-            }
-            size = (i - pagenum) * PAGESIZE;
-        }
-    }
-    return size;
-}
-
-
-/**
- *
+ * Determine the base address of the block containing p.  If p is not a gc
+ * allocated pointer, return null.
  */
 BlkInfo getInfo(void* p)
 {
-    Pool*   pool;
+    assert (p !is null);
+    Pool* pool = findPool(p);
+    if (pool is null)
+        return BlkInfo.init;
     BlkInfo info;
-
-    pool = findPool(p);
-    if (pool)
-    {
-        size_t offset = cast(size_t)(p - pool.baseAddr);
-        size_t pn = offset / PAGESIZE;
-        Bins   bin = cast(Bins)pool.pagetable[pn];
-
-        ////////////////////////////////////////////////////////////////////
-        // findAddr
-        ////////////////////////////////////////////////////////////////////
-
-        if (bin <= B_PAGE)
-        {
-            info.base = pool.baseAddr + (offset & notbinsize[bin]);
-        }
-        else if (bin == B_PAGEPLUS)
-        {
-            do
-            {
-                --pn, offset -= PAGESIZE;
-            }
-            while (cast(Bins)pool.pagetable[pn] == B_PAGEPLUS);
-
-            info.base = pool.baseAddr + (offset & (offset.max ^ (PAGESIZE-1)));
-
-            // fix bin for use by size calc below
-            bin = cast(Bins)pool.pagetable[pn];
-        }
-
-        ////////////////////////////////////////////////////////////////////
-        // findSize
-        ////////////////////////////////////////////////////////////////////
-
-        info.size = binsize[bin];
-        if (bin == B_PAGE)
-        {
-            ubyte* pt;
-            size_t i;
-
-            pt = &pool.pagetable[0];
-            for (i = pn + 1; i < pool.npages; i++)
-            {
-                if (pt[i] != B_PAGEPLUS)
-                    break;
-            }
-            info.size = (i - pn) * PAGESIZE;
-        }
-
-        ////////////////////////////////////////////////////////////////////
-        // getAttr
-        ////////////////////////////////////////////////////////////////////
-
-        info.attr = getAttr(pool, cast(size_t)(offset / 16));
-        if (!(info.attr & BlkAttr.NO_SCAN))
-            info.size -= (size_t*).sizeof;  // bitmask
-    }
+    info.base = pool.findBase(p);
+    info.size = pool.findSize(info.base);
+    info.attr = getAttr(pool, cast(size_t)(info.base - pool.baseAddr) / 16u);
+    if (!opts.options.conservative && !(info.attr & BlkAttr.NO_SCAN))
+        info.size -= size_t.sizeof; // PointerMap bitmask
     return info;
 }
 
@@ -477,7 +360,7 @@ static Bins findBin(size_t size)
  * Mark all memory in the pool as B_FREE.
  * Return the actual number of bytes reserved or 0 on error.
  */
-size_t reserveNoSync(size_t size)
+size_t reserve(size_t size)
 {
     assert(size != 0);
     size_t npages = (size + PAGESIZE - 1) / PAGESIZE;
@@ -492,7 +375,7 @@ size_t reserveNoSync(size_t size)
 /**
  * Minimizes physical memory usage by returning free pools to the OS.
  */
-void minimizeNoSync()
+void minimize()
 {
     size_t n;
     size_t pn;
@@ -1276,172 +1159,10 @@ void initialize()
 }
 
 
-/**
- *
- */
-void enable()
-{
-    if (!thread_needLock())
-    {
-        assert(gc.disabled > 0);
-        gc.disabled--;
-    }
-    else synchronized (gc.lock)
-    {
-        assert(gc.disabled > 0);
-        gc.disabled--;
-    }
-}
-
-
-/**
- *
- */
-void disable()
-{
-    if (!thread_needLock())
-    {
-        gc.disabled++;
-    }
-    else synchronized (gc.lock)
-    {
-        gc.disabled++;
-    }
-}
-
-
-/**
- *
- */
-uint getAttr(void* p)
-{
-    if (!p)
-    {
-        return 0;
-    }
-
-    uint go()
-    {
-        Pool* pool = findPool(p);
-        uint  old_attrs = 0;
-
-        if (pool)
-        {
-            auto bit_i = cast(size_t)(p - pool.baseAddr) / 16;
-
-            old_attrs = getAttr(pool, bit_i);
-        }
-        return old_attrs;
-    }
-
-    if (!thread_needLock())
-    {
-        return go();
-    }
-    else synchronized (gc.lock)
-    {
-        return go();
-    }
-}
-
-
-/**
- *
- */
-uint setAttr(void* p, uint mask)
-{
-    if (!p)
-    {
-        return 0;
-    }
-
-    uint go()
-    {
-        Pool* pool = findPool(p);
-        uint  old_attrs = 0;
-
-        if (pool)
-        {
-            auto bit_i = cast(size_t)(p - pool.baseAddr) / 16;
-
-            old_attrs = getAttr(pool, bit_i);
-            setAttr(pool, bit_i, mask);
-        }
-        return old_attrs;
-    }
-
-    if (!thread_needLock())
-    {
-        return go();
-    }
-    else synchronized (gc.lock)
-    {
-        return go();
-    }
-}
-
-
-/**
- *
- */
-uint clrAttr(void* p, uint mask)
-{
-    if (!p)
-    {
-        return 0;
-    }
-
-    uint go()
-    {
-        Pool* pool = findPool(p);
-        uint  old_attrs = 0;
-
-        if (pool)
-        {
-            auto bit_i = cast(size_t)(p - pool.baseAddr) / 16;
-
-            old_attrs = getAttr(pool, bit_i);
-            clrAttr(pool, bit_i, mask);
-        }
-        return old_attrs;
-    }
-
-    if (!thread_needLock())
-    {
-        return go();
-    }
-    else synchronized (gc.lock)
-    {
-        return go();
-    }
-}
-
-
-/**
- *
- */
-void *malloc(size_t size, uint attrs, PointerMap ptrmap)
-{
-    if (!size)
-    {
-        return null;
-    }
-
-    if (!thread_needLock())
-    {
-        return mallocNoSync(size, attrs, ptrmap.bits.ptr);
-    }
-    else synchronized (gc.lock)
-    {
-        return mallocNoSync(size, attrs, ptrmap.bits.ptr);
-    }
-}
-
-
 //
 //
 //
-private void *mallocNoSync(size_t size, uint attrs, size_t* pm_bitmask)
+private void *malloc(size_t size, uint attrs, size_t* pm_bitmask)
 {
     assert(size != 0);
 
@@ -1549,73 +1270,36 @@ private void *mallocNoSync(size_t size, uint attrs, size_t* pm_bitmask)
 }
 
 
-/**
- *
- */
-void *calloc(size_t size, uint attrs, PointerMap ptrmap)
-{
-    if (!size)
-    {
-        return null;
-    }
-
-    if (!thread_needLock())
-    {
-        return callocNoSync(size, attrs, ptrmap.bits.ptr);
-    }
-    else synchronized (gc.lock)
-    {
-        return callocNoSync(size, attrs, ptrmap.bits.ptr);
-    }
-}
-
-
 //
 //
 //
-private void *callocNoSync(size_t size, uint attrs, size_t* pm_bitmask)
+private void *calloc(size_t size, uint attrs, size_t* pm_bitmask)
 {
     assert(size != 0);
 
-    void *p = mallocNoSync(size, attrs, pm_bitmask);
+    void *p = malloc(size, attrs, pm_bitmask);
     memset(p, 0, size);
     return p;
 }
 
 
-/**
- *
- */
-void *realloc(void *p, size_t size, uint attrs, PointerMap ptrmap)
-{
-    if (!thread_needLock())
-    {
-        return reallocNoSync(p, size, attrs, ptrmap.bits.ptr);
-    }
-    else synchronized (gc.lock)
-    {
-        return reallocNoSync(p, size, attrs, ptrmap.bits.ptr);
-    }
-}
-
-
 //
 //
 //
-private void *reallocNoSync(void *p, size_t size, uint attrs,
+private void *realloc(void *p, size_t size, uint attrs,
         size_t* pm_bitmask)
 {
     if (!size)
     {
         if (p)
         {
-            freeNoSync(p);
+            free(p);
             p = null;
         }
     }
     else if (!p)
     {
-        p = mallocNoSync(size, attrs, pm_bitmask);
+        p = malloc(size, attrs, pm_bitmask);
     }
     else
     {
@@ -1632,8 +1316,8 @@ private void *reallocNoSync(void *p, size_t size, uint attrs,
         else
             attrs = getAttr(pool, bit_i);
 
-        void* blk_base_addr = findBase(p);
-        size_t blk_size = findSize(p);
+        void* blk_base_addr = pool.findBase(p);
+        size_t blk_size = pool.findSize(p);
         bool has_pm = has_pointermap(attrs);
         size_t pm_bitmask_size = 0;
         if (has_pm) {
@@ -1652,7 +1336,7 @@ private void *reallocNoSync(void *p, size_t size, uint attrs,
             size_t sentinel_stored_size = *sentinel_size(p);
             if (sentinel_stored_size != size)
             {
-                void* p2 = mallocNoSync(size, attrs, pm_bitmask);
+                void* p2 = malloc(size, attrs, pm_bitmask);
                 if (sentinel_stored_size < size)
                     size = sentinel_stored_size;
                 cstring.memcpy(p2, p, size);
@@ -1674,13 +1358,10 @@ private void *reallocNoSync(void *p, size_t size, uint attrs,
                 if (newsz < psz)
                 {
                     // Shrink in place
-                    synchronized (gc.lock)
-                    {
-                        if (opts.options.mem_stomp)
-                            memset(p + size - pm_bitmask_size, 0xF2,
-                                    blk_size - size - pm_bitmask_size);
-                        pool.freePages(pagenum + newsz, psz - newsz);
-                    }
+                    if (opts.options.mem_stomp)
+                        memset(p + size - pm_bitmask_size, 0xF2,
+                                blk_size - size - pm_bitmask_size);
+                    pool.freePages(pagenum + newsz, psz - newsz);
                     if (has_pm) {
                         auto end_of_blk = cast(size_t**)(
                                 blk_base_addr + (PAGESIZE * newsz) -
@@ -1692,35 +1373,32 @@ private void *reallocNoSync(void *p, size_t size, uint attrs,
                 else if (pagenum + newsz <= pool.npages)
                 {
                     // Attempt to expand in place
-                    synchronized (gc.lock)
+                    for (size_t i = pagenum + psz; 1;)
                     {
-                        for (size_t i = pagenum + psz; 1;)
+                        if (i == pagenum + newsz)
                         {
-                            if (i == pagenum + newsz)
-                            {
-                                if (opts.options.mem_stomp)
-                                    memset(p + blk_size - pm_bitmask_size,
-                                            0xF0, size - blk_size
-                                            - pm_bitmask_size);
-                                memset(pool.pagetable + pagenum +
-                                        psz, B_PAGEPLUS, newsz - psz);
-                                if (has_pm) {
-                                    auto end_of_blk = cast(size_t**)(
-                                            blk_base_addr +
-                                            (PAGESIZE * newsz) -
-                                            pm_bitmask_size);
-                                    *end_of_blk = pm_bitmask;
-                                }
-                                return p;
+                            if (opts.options.mem_stomp)
+                                memset(p + blk_size - pm_bitmask_size,
+                                        0xF0, size - blk_size
+                                        - pm_bitmask_size);
+                            memset(pool.pagetable + pagenum +
+                                    psz, B_PAGEPLUS, newsz - psz);
+                            if (has_pm) {
+                                auto end_of_blk = cast(size_t**)(
+                                        blk_base_addr +
+                                        (PAGESIZE * newsz) -
+                                        pm_bitmask_size);
+                                *end_of_blk = pm_bitmask;
                             }
-                            if (i == pool.npages)
-                            {
-                                break;
-                            }
-                            if (pool.pagetable[i] != B_FREE)
-                                break;
-                            i++;
+                            return p;
+                        }
+                        if (i == pool.npages)
+                        {
+                            break;
                         }
+                        if (pool.pagetable[i] != B_FREE)
+                            break;
+                        i++;
                     }
                 }
             }
@@ -1729,7 +1407,7 @@ private void *reallocNoSync(void *p, size_t size, uint attrs,
             {
                 size -= pm_bitmask_size;
                 blk_size -= pm_bitmask_size;
-                void* p2 = mallocNoSync(size, attrs, pm_bitmask);
+                void* p2 = malloc(size, attrs, pm_bitmask);
                 if (blk_size < size)
                     size = blk_size;
                 cstring.memcpy(p2, p, size);
@@ -1743,30 +1421,14 @@ private void *reallocNoSync(void *p, size_t size, uint attrs,
 
 /**
  * Attempt to in-place enlarge the memory block pointed to by p by at least
- * minbytes beyond its current capacity, up to a maximum of maxsize.  This
+ * min_size beyond its current capacity, up to a maximum of max_size.  This
  * does not attempt to move the memory block (like realloc() does).
  *
  * Returns:
  *  0 if could not extend p,
  *  total size of entire memory block if successful.
  */
-size_t extend(void* p, size_t minsize, size_t maxsize)
-{
-    if (!thread_needLock())
-    {
-        return extendNoSync(p, minsize, maxsize);
-    }
-    else synchronized (gc.lock)
-    {
-        return extendNoSync(p, minsize, maxsize);
-    }
-}
-
-
-//
-//
-//
-private size_t extendNoSync(void* p, size_t minsize, size_t maxsize)
+private size_t extend(void* p, size_t minsize, size_t maxsize)
 in
 {
     assert( minsize <= maxsize );
@@ -1784,8 +1446,8 @@ body
     auto bit_i = cast(size_t)(p - pool.baseAddr) / 16;
     uint attrs = getAttr(pool, bit_i);
 
-    void* blk_base_addr = findBase(p);
-    size_t blk_size = findSize(p);
+    void* blk_base_addr = pool.findBase(p);
+    size_t blk_size = pool.findSize(p);
     bool has_pm = has_pointermap(attrs);
     size_t* pm_bitmask = null;
     size_t pm_bitmask_size = 0;
@@ -1843,52 +1505,10 @@ body
 }
 
 
-/**
- *
- */
-size_t reserve(size_t size)
-{
-    if (!size)
-    {
-        return 0;
-    }
-
-    if (!thread_needLock())
-    {
-        return reserveNoSync(size);
-    }
-    else synchronized (gc.lock)
-    {
-        return reserveNoSync(size);
-    }
-}
-
-
-/**
- *
- */
-void free(void *p)
-{
-    if (!p)
-    {
-        return;
-    }
-
-    if (!thread_needLock())
-    {
-        return freeNoSync(p);
-    }
-    else synchronized (gc.lock)
-    {
-        return freeNoSync(p);
-    }
-}
-
-
 //
 //
 //
-private void freeNoSync(void *p)
+private void free(void *p)
 {
     assert (p);
 
@@ -1935,68 +1555,11 @@ private void freeNoSync(void *p)
 }
 
 
-/**
- * Determine the base address of the block containing p.  If p is not a gc
- * allocated pointer, return null.
- */
-void* addrOf(void *p)
-{
-    if (!p)
-    {
-        return null;
-    }
-
-    if (!thread_needLock())
-    {
-        return addrOfNoSync(p);
-    }
-    else synchronized (gc.lock)
-    {
-        return addrOfNoSync(p);
-    }
-}
-
-
-//
-//
-//
-void* addrOfNoSync(void *p)
-{
-    if (!p)
-    {
-        return null;
-    }
-
-    return findBase(p);
-}
-
-
 /**
  * Determine the allocated size of pointer p.  If p is an interior pointer
  * or not a gc allocated pointer, return 0.
  */
-size_t sizeOf(void *p)
-{
-    if (!p)
-    {
-        return 0;
-    }
-
-    if (!thread_needLock())
-    {
-        return sizeOfNoSync(p);
-    }
-    else synchronized (gc.lock)
-    {
-        return sizeOfNoSync(p);
-    }
-}
-
-
-//
-//
-//
-private size_t sizeOfNoSync(void *p)
+private size_t sizeOf(void *p)
 {
     assert (p);
 
@@ -2010,7 +1573,7 @@ private size_t sizeOfNoSync(void *p)
     auto biti = cast(size_t)(p - pool.baseAddr) / 16;
     uint attrs = getAttr(pool, biti);
 
-    size_t size = findSize(p);
+    size_t size = pool.findSize(p);
     size_t pm_bitmask_size = 0;
     if (has_pointermap(attrs))
         pm_bitmask_size = size_t.sizeof;
@@ -2043,67 +1606,12 @@ private size_t sizeOfNoSync(void *p)
 }
 
 
-/**
- * Determine the base address of the block containing p.  If p is not a gc
- * allocated pointer, return null.
- */
-BlkInfo query(void *p)
-{
-    if (!p)
-    {
-        BlkInfo i;
-        return  i;
-    }
-
-    if (!thread_needLock())
-    {
-        return queryNoSync(p);
-    }
-    else synchronized (gc.lock)
-    {
-        return queryNoSync(p);
-    }
-}
-
-
-//
-//
-//
-BlkInfo queryNoSync(void *p)
-{
-    assert(p);
-
-    return getInfo(p);
-}
-
-
 /**
  * Verify that pointer p:
  *  1) belongs to this memory pool
  *  2) points to the start of an allocated piece of memory
  *  3) is not on a free list
  */
-void check(void *p)
-{
-    if (!p)
-    {
-        return;
-    }
-
-    if (!thread_needLock())
-    {
-        checkNoSync(p);
-    }
-    else synchronized (gc.lock)
-    {
-        checkNoSync(p);
-    }
-}
-
-
-//
-//
-//
 private void checkNoSync(void *p)
 {
     assert(p);
@@ -2168,180 +1676,13 @@ private void setStackBottom(void *p)
 }
 
 
-/**
- * add p to list of roots
- */
-void addRoot(void *p)
-{
-    if (!p)
-    {
-        return;
-    }
-
-    if (!thread_needLock())
-    {
-        if (gc.roots.append(p) is null)
-            onOutOfMemoryError();
-    }
-    else synchronized (gc.lock)
-    {
-        if (gc.roots.append(p) is null)
-            onOutOfMemoryError();
-    }
-}
-
-
-/**
- * remove p from list of roots
- */
-void removeRoot(void *p)
-{
-    if (!p)
-    {
-        return;
-    }
-
-    bool r;
-    if (!thread_needLock())
-    {
-        r = gc.roots.remove(p);
-    }
-    else synchronized (gc.lock)
-    {
-        r = gc.roots.remove(p);
-    }
-    assert (r);
-}
-
-
-/**
- * add range to scan for roots
- */
-void addRange(void *p, size_t sz)
-{
-    if (!p || !sz)
-    {
-        return;
-    }
-
-    if (!thread_needLock())
-    {
-        if (gc.ranges.append(Range(p, p+sz)) is null)
-            onOutOfMemoryError();
-    }
-    else synchronized (gc.lock)
-    {
-        if (gc.ranges.append(Range(p, p+sz)) is null)
-            onOutOfMemoryError();
-    }
-}
-
-
-/**
- * remove range
- */
-void removeRange(void *p)
-{
-    if (!p)
-    {
-        return;
-    }
-
-    bool r;
-    if (!thread_needLock())
-    {
-        r = gc.ranges.remove(Range(p, null));
-    }
-    else synchronized (gc.lock)
-    {
-        r = gc.ranges.remove(Range(p, null));
-    }
-    assert (r);
-}
-
-
-/**
- * do full garbage collection
- */
-void fullCollect()
-{
-
-    if (!thread_needLock())
-    {
-        fullcollectshell();
-    }
-    else synchronized (gc.lock)
-    {
-        fullcollectshell();
-    }
-
-    version (none)
-    {
-        GCStats stats;
-        getStats(stats);
-    }
-
-}
-
-
-/**
- * do full garbage collection ignoring roots
- */
-void fullCollectNoStack()
-{
-    if (!thread_needLock())
-    {
-        gc.no_stack++;
-        fullcollectshell();
-        gc.no_stack--;
-    }
-    else synchronized (gc.lock)
-    {
-        gc.no_stack++;
-        fullcollectshell();
-        gc.no_stack--;
-    }
-}
-
-
-/**
- * minimize free space usage
- */
-void minimize()
-{
-    if (!thread_needLock())
-    {
-        minimizeNoSync();
-    }
-    else synchronized (gc.lock)
-    {
-        minimizeNoSync();
-    }
-}
-
-
 /**
  * Retrieve statistics about garbage collection.
  * Useful for debugging and tuning.
  */
-void getStats(out GCStats stats)
-{
-    if (!thread_needLock())
-    {
-        getStatsNoSync(stats);
-    }
-    else synchronized (gc.lock)
-    {
-        getStatsNoSync(stats);
-    }
-}
-
-
-//
-//
-//
-private void getStatsNoSync(out GCStats stats)
+private GCStats getStats()
 {
+    GCStats stats;
     size_t psize = 0;
     size_t usize = 0;
     size_t flsize = 0;
@@ -2349,8 +1690,6 @@ private void getStatsNoSync(out GCStats stats)
     size_t n;
     size_t bsize = 0;
 
-    memset(&stats, 0, GCStats.sizeof);
-
     for (n = 0; n < gc.pools.length; n++)
     {
         Pool* pool = gc.pools[n];
@@ -2378,19 +1717,11 @@ private void getStatsNoSync(out GCStats stats)
     stats.poolsize = psize;
     stats.usedsize = bsize - flsize;
     stats.freelistsize = flsize;
+    return stats;
 }
 
 /******************* weak-reference support *********************/
 
-// call locked if necessary
-private T locked(T)(in T delegate() code)
-{
-    if (thread_needLock)
-        synchronized(gc.lock) return code();
-    else
-       return code();
-}
-
 private struct WeakPointer
 {
     Object reference;
@@ -2401,7 +1732,9 @@ private struct WeakPointer
         // lock for memory consistency (parallel readers)
         // also ensures that weakpointerDestroy can be called while another
         // thread is freeing the reference with "delete"
-        locked!(void)({ reference = null; });
+        return locked!(void, () {
+            reference = null;
+        })();
     }
 }
 
@@ -2438,10 +1771,10 @@ void weakpointerDestroy( void* p )
         auto wp = cast(WeakPointer*)p;
         // must be extra careful about the GC or parallel threads
         // finalizing the reference at the same time
-        locked!(void)({
-               if (wp.reference)
-                   rt_detachDisposeEvent(wp.reference, &wp.ondestroy);
-              });
+        return locked!(void, () {
+            if (wp.reference)
+                rt_detachDisposeEvent(wp.reference, &wp.ondestroy);
+        })();
         cstdlib.free(wp);
     }
 }
@@ -2459,9 +1792,9 @@ Object weakpointerGet( void* p )
         // that'd require core.sync.Atomic and lots of care about memory
         // consistency it's an optional optimization see
         // http://dsource.org/projects/tango/browser/trunk/user/tango/core/Lifetime.d?rev=5100#L158
-        return locked!(Object)({
-              return (cast(WeakPointer*)p).reference;
-              });
+        return locked!(Object, () {
+            return (cast(WeakPointer*)p).reference;
+        })();
         }
 }
 
@@ -2604,6 +1937,47 @@ struct Pool
     }
 
 
+    /**
+     * Find base address of block containing pointer p.
+     * Returns null if the pointer doesn't belong to this pool
+     */
+    void* findBase(void *p)
+    {
+        size_t offset = cast(size_t)(p - this.baseAddr);
+        size_t pagenum = offset / PAGESIZE;
+        Bins bin = cast(Bins)this.pagetable[pagenum];
+        // Adjust bit to be at start of allocated memory block
+        if (bin <= B_PAGE)
+            return this.baseAddr + (offset & notbinsize[bin]);
+        if (bin == B_PAGEPLUS) {
+            do {
+                --pagenum, offset -= PAGESIZE;
+            } while (cast(Bins)this.pagetable[pagenum] == B_PAGEPLUS);
+            return this.baseAddr + (offset & (offset.max ^ (PAGESIZE-1)));
+        }
+        // we are in a B_FREE page
+        return null;
+    }
+
+
+    /**
+     * Find size of pointer p.
+     * Returns 0 if p doesn't belong to this pool if if it's block size is less
+     * than a PAGE.
+     */
+    size_t findSize(void *p)
+    {
+        size_t pagenum = cast(size_t)(p - this.baseAddr) / PAGESIZE;
+        Bins bin = cast(Bins)this.pagetable[pagenum];
+        if (bin != B_PAGE)
+            return binsize[bin];
+        for (size_t i = pagenum + 1; i < this.npages; i++)
+            if (this.pagetable[i] != B_PAGEPLUS)
+                return (i - pagenum) * PAGESIZE;
+        return (this.npages - pagenum) * PAGESIZE;
+    }
+
+
     /**
      * Used for sorting pools
      */
@@ -2663,27 +2037,27 @@ void *sentinel_sub(void *p)
 
 private int _termCleanupLevel=1;
 
+extern (C):
+
 /// sets the cleanup level done by gc
-/// (0: none, 1: fullCollect, 2: fullCollectNoStack (might crash daemonThreads))
+/// 0: none
+/// 1: fullCollect
+/// 2: fullCollect ignoring stack roots (might crash daemonThreads)
 /// result !=0 if the value was invalid
-extern (C) int gc_setTermCleanupLevel(int cLevel){
+int gc_setTermCleanupLevel(int cLevel)
+{
     if (cLevel<0 || cLevel>2) return cLevel;
     _termCleanupLevel=cLevel;
     return 0;
 }
 
 /// returns the cleanup level done by gc
-extern (C) int gc_getTermCleanupLevel(){
+int gc_getTermCleanupLevel()
+{
     return _termCleanupLevel;
 }
 
-version (DigitalMars) version(OSX) {
-    extern(C) void _d_osx_image_init();
-}
-
-extern (C) void thread_init();
-
-extern (C) void gc_init()
+void gc_init()
 {
     scope (exit) assert (Invariant());
     gc = cast(GC*) cstdlib.calloc(1, GC.sizeof);
@@ -2697,7 +2071,7 @@ extern (C) void gc_init()
     thread_init();
 }
 
-extern (C) void gc_term()
+void gc_term()
 {
     assert (Invariant());
     if (_termCleanupLevel<1) {
@@ -2714,163 +2088,262 @@ extern (C) void gc_term()
         //       I'm disabling cleanup for now until I can think about it some
         //       more.
         //
-        fullCollectNoStack(); // not really a 'collect all' -- still scans
-                                  // static data area, roots, and ranges.
+        // not really a 'collect all' -- still scans static data area, roots,
+        // and ranges.
+        return locked!(void, () {
+            gc.no_stack++;
+            fullcollectshell();
+            gc.no_stack--;
+        })();
     } else {
         // default (safe) clenup
-        fullCollect();
+        return locked!(void, () {
+            fullcollectshell();
+        })();
     }
 }
 
-extern (C) void gc_enable()
+void gc_enable()
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    enable();
+    return locked!(void, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        assert (gc.disabled > 0);
+        gc.disabled--;
+    })();
 }
 
-extern (C) void gc_disable()
+void gc_disable()
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    disable();
+    return locked!(void, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        gc.disabled++;
+    })();
 }
 
-extern (C) void gc_collect()
+void gc_collect()
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    fullCollect();
+    return locked!(void, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        fullcollectshell();
+    })();
 }
 
 
-extern (C) void gc_minimize()
+void gc_minimize()
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    minimize();
+    return locked!(void, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        minimize();
+    })();
 }
 
-extern (C) uint gc_getAttr( void* p )
+uint gc_getAttr(void* p)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    return getAttr(p);
+    if (p is null)
+        return 0;
+    return locked!(uint, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        Pool* pool = findPool(p);
+        if (pool is null)
+            return 0u;
+        auto bit_i = cast(size_t)(p - pool.baseAddr) / 16;
+        return getAttr(pool, bit_i);
+    })();
 }
 
-extern (C) uint gc_setAttr( void* p, uint a )
+uint gc_setAttr(void* p, uint attrs)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    return setAttr(p, a);
+    if (p is null)
+        return 0;
+    return locked!(uint, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        Pool* pool = findPool(p);
+        if (pool is null)
+            return 0u;
+        auto bit_i = cast(size_t)(p - pool.baseAddr) / 16;
+        uint old_attrs = getAttr(pool, bit_i);
+        setAttr(pool, bit_i, attrs);
+        return old_attrs;
+    })();
 }
 
-extern (C) uint gc_clrAttr( void* p, uint a )
+uint gc_clrAttr(void* p, uint attrs)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    return clrAttr(p, a);
+    if (p is null)
+        return 0;
+    return locked!(uint, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        Pool* pool = findPool(p);
+        if (pool is null)
+            return 0u;
+        auto bit_i = cast(size_t)(p - pool.baseAddr) / 16;
+        uint old_attrs = getAttr(pool, bit_i);
+        clrAttr(pool, bit_i, attrs);
+        return old_attrs;
+    })();
 }
 
-extern (C) void* gc_malloc(size_t sz, uint attrs = 0,
+void* gc_malloc(size_t size, uint attrs = 0,
         PointerMap ptrmap = PointerMap.init)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    return malloc(sz, attrs, ptrmap);
+    if (size == 0)
+        return null;
+    return locked!(void*, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        return malloc(size, attrs, ptrmap.bits.ptr);
+    })();
 }
 
-extern (C) void* gc_calloc(size_t sz, uint attrs = 0,
+void* gc_calloc(size_t size, uint attrs = 0,
         PointerMap ptrmap = PointerMap.init)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    return calloc(sz, attrs, ptrmap);
+    if (size == 0)
+        return null;
+    return locked!(void*, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        return calloc(size, attrs, ptrmap.bits.ptr);
+    })();
 }
 
-extern (C) void* gc_realloc(void* p, size_t sz, uint attrs = 0,
+void* gc_realloc(void* p, size_t size, uint attrs = 0,
         PointerMap ptrmap = PointerMap.init)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    return realloc(p, sz, attrs, ptrmap);
+    return locked!(void*, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        return realloc(p, size, attrs, ptrmap.bits.ptr);
+    })();
 }
 
-extern (C) size_t gc_extend( void* p, size_t mx, size_t sz )
+size_t gc_extend(void* p, size_t min_size, size_t max_size)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    return extend(p, mx, sz);
+    return locked!(size_t, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        return extend(p, min_size, max_size);
+    })();
 }
 
-extern (C) size_t gc_reserve( size_t sz )
+size_t gc_reserve(size_t size)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    return reserve(sz);
+    if (size == 0)
+        return 0;
+    return locked!(size_t, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        return reserve(size);
+    })();
 }
 
-extern (C) void gc_free( void* p )
+void gc_free(void* p)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    free(p);
+    if (p is null)
+        return;
+    return locked!(void, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        free(p);
+    })();
 }
 
-extern (C) void* gc_addrOf( void* p )
+void* gc_addrOf(void* p)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    return addrOf(p);
+    if (p is null)
+        return null;
+    return locked!(void*, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        Pool* pool = findPool(p);
+        if (pool is null)
+            return null;
+        return pool.findBase(p);
+    })();
 }
 
-extern (C) size_t gc_sizeOf( void* p )
+size_t gc_sizeOf(void* p)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    return sizeOf(p);
+    if (p is null)
+        return 0;
+    return locked!(size_t, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        return sizeOf(p);
+    })();
 }
 
-extern (C) BlkInfo gc_query( void* p )
+BlkInfo gc_query(void* p)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    return query(p);
+    if (p is null)
+        return BlkInfo.init;
+    return locked!(BlkInfo, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        return getInfo(p);
+    })();
 }
 
 // NOTE: This routine is experimental.  The stats or function name may change
 //       before it is made officially available.
-extern (C) GCStats gc_stats()
+GCStats gc_stats()
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    GCStats stats = void;
-    getStats(stats);
-    return stats;
+    return locked!(GCStats, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        return getStats();
+    })();
 }
 
-extern (C) void gc_addRoot( void* p )
+void gc_addRoot(void* p)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    addRoot(p);
+    if (p is null)
+        return;
+    return locked!(void, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        if (gc.roots.append(p) is null)
+            onOutOfMemoryError();
+    })();
 }
 
-extern (C) void gc_addRange( void* p, size_t sz )
+void gc_addRange(void* p, size_t size)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    addRange(p, sz);
+    if (p is null || size == 0)
+        return;
+    return locked!(void, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        if (gc.ranges.append(Range(p, p + size)) is null)
+            onOutOfMemoryError();
+    })();
 }
 
-extern (C) void gc_removeRoot( void *p )
+void gc_removeRoot(void* p)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    removeRoot(p);
+    if (p is null)
+        return;
+    return locked!(void, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        bool r = gc.roots.remove(p);
+        assert (r);
+    })();
 }
 
-extern (C) void gc_removeRange( void *p )
+void gc_removeRange(void* p)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
-    removeRange(p);
+    if (p is null)
+        return;
+    return locked!(void, () {
+        assert (Invariant()); scope (exit) assert (Invariant());
+        bool r = gc.ranges.remove(Range(p, null));
+        assert (r);
+    })();
 }
 
-extern (C) void* gc_weakpointerCreate( Object r )
+void* gc_weakpointerCreate(Object r)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
+    // weakpointers do their own locking
     return weakpointerCreate(r);
 }
 
-extern (C) void gc_weakpointerDestroy( void* wp )
+void gc_weakpointerDestroy(void* wp)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
+    // weakpointers do their own locking
     weakpointerDestroy(wp);
 }
 
-extern (C) Object gc_weakpointerGet( void* wp )
+Object gc_weakpointerGet(void* wp)
 {
-    assert (Invariant()); scope (exit) assert (Invariant());
+    // weakpointers do their own locking
     return weakpointerGet(wp);
 }