gc:stack compiles with --threads:on

lib/system/gc_stack.nim

@@ -11,8 +11,8 @@
 when defined(nimphpext):
   proc roundup(x, v: int): int {.inline.} =
     result = (x + (v-1)) and not (v-1)
-  proc emalloc(size: int): pointer {.importc:"_emalloc".}
-  proc efree(mem: pointer) {.importc:"_efree".}
+  proc emalloc(size: int): pointer {.importc: "_emalloc".}
+  proc efree(mem: pointer) {.importc: "_efree".}
 
   proc osAllocPages(size: int): pointer {.inline.} =
     emalloc(size)
@@ -144,11 +144,12 @@ proc runFinalizers(c: Chunk) =
       (cast[Finalizer](it.typ.finalizer))(it+!sizeof(ObjHeader))
     it = it.nextFinal
 
-proc dealloc(r: var MemRegion; p: pointer) =
-  let it = cast[ptr ObjHeader](p-!sizeof(ObjHeader))
-  if it.typ != nil and it.typ.finalizer != nil:
-    (cast[Finalizer](it.typ.finalizer))(p)
-  it.typ = nil
+when false:
+  proc dealloc(r: var MemRegion; p: pointer) =
+    let it = cast[ptr ObjHeader](p-!sizeof(ObjHeader))
+    if it.typ != nil and it.typ.finalizer != nil:
+      (cast[Finalizer](it.typ.finalizer))(p)
+    it.typ = nil
 
 proc deallocAll(r: var MemRegion; head: Chunk) =
   var it = head
@@ -187,6 +188,8 @@ proc obstackPtr*(): StackPtr = tlRegion.obstackPtr()
 proc setObstackPtr*(sp: StackPtr) = tlRegion.setObstackPtr(sp)
 proc deallocAll*() = tlRegion.deallocAll()
 
+proc deallocOsPages(r: var MemRegion) = r.deallocAll()
+
 proc joinRegion*(dest: var MemRegion; src: MemRegion) =
   # merging is not hard.
   if dest.head.isNil:
@@ -424,6 +427,13 @@ proc realloc(p: pointer, newsize: Natural): pointer =
   if result == nil: raiseOutOfMem()
 proc dealloc(p: pointer) = cfree(p)
 
+proc alloc0(r: var MemRegion; size: Natural): pointer =
+  # ignore the region. That is correct for the channels module
+  # but incorrect in general. XXX
+  result = alloc0(size)
+
+proc dealloc(r: var MemRegion; p: pointer) = dealloc(p)
+
 proc allocShared(size: Natural): pointer =
   result = cmalloc(size)
   if result == nil: raiseOutOfMem()