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diff --git a/bin/minject.exe b/bin/minject.exe
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diff --git a/bin/minject32.exe b/bin/minject32.exe
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diff --git a/include/mimalloc.h b/include/mimalloc.h
index be28f17a..b14cba52 100644
--- a/include/mimalloc.h
+++ b/include/mimalloc.h
@@ -148,7 +148,6 @@ typedef void (mi_cdecl mi_error_fun)(int err, void* arg);
 mi_decl_export void mi_register_error(mi_error_fun* fun, void* arg);
 
 mi_decl_export void mi_collect(bool force)    mi_attr_noexcept;
-mi_decl_export void mi_collect_reduce(size_t target_thread_owned) mi_attr_noexcept;
 mi_decl_export int  mi_version(void)          mi_attr_noexcept;
 mi_decl_export void mi_stats_reset(void)      mi_attr_noexcept;
 mi_decl_export void mi_stats_merge(void)      mi_attr_noexcept;
@@ -291,17 +290,26 @@ mi_decl_nodiscard mi_decl_export mi_heap_t* mi_heap_new_in_arena(mi_arena_id_t a
 #endif
 
 
-// Experimental: allow sub-processes whose memory segments stay separated (and no reclamation between them)
-// Used for example for separate interpreter's in one process.
+// Experimental: allow sub-processes whose memory areas stay separated (and no reclamation between them)
+// Used for example for separate interpreters in one process.
 typedef void* mi_subproc_id_t;
 mi_decl_export mi_subproc_id_t mi_subproc_main(void);
 mi_decl_export mi_subproc_id_t mi_subproc_new(void);
 mi_decl_export void mi_subproc_delete(mi_subproc_id_t subproc);
 mi_decl_export void mi_subproc_add_current_thread(mi_subproc_id_t subproc); // this should be called right after a thread is created (and no allocation has taken place yet)
 
-// Experimental: visit abandoned heap areas (from threads that have been terminated)
+// Experimental: visit abandoned heap areas (that are not owned by a specific heap)
 mi_decl_export bool mi_abandoned_visit_blocks(mi_subproc_id_t subproc_id, int heap_tag, bool visit_blocks, mi_block_visit_fun* visitor, void* arg);
 
+// Experimental: objects followed by a guard page.
+// A sample rate of 0 disables guarded objects, while 1 uses a guard page for every object.
+// A seed of 0 uses a random start point. Only objects within the size bound are eligable for guard pages.
+mi_decl_export void mi_heap_guarded_set_sample_rate(mi_heap_t* heap, size_t sample_rate, size_t seed);
+mi_decl_export void mi_heap_guarded_set_size_bound(mi_heap_t* heap, size_t min, size_t max);
+
+// Experimental: communicate that the thread is part of a threadpool
+mi_decl_export void mi_thread_set_in_threadpool(void) mi_attr_noexcept;  
+
 // Experimental: create a new heap with a specified heap tag. Set `allow_destroy` to false to allow the thread
 // to reclaim abandoned memory (with a compatible heap_tag and arena_id) but in that case `mi_heap_destroy` will
 // fall back to `mi_heap_delete`.
@@ -309,12 +317,8 @@ mi_decl_nodiscard mi_decl_export mi_heap_t* mi_heap_new_ex(int heap_tag, bool al
 
 // deprecated
 mi_decl_export int mi_reserve_huge_os_pages(size_t pages, double max_secs, size_t* pages_reserved) mi_attr_noexcept;
+mi_decl_export void mi_collect_reduce(size_t target_thread_owned) mi_attr_noexcept;
 
-// Experimental: objects followed by a guard page.
-// A sample rate of 0 disables guarded objects, while 1 uses a guard page for every object.
-// A seed of 0 uses a random start point. Only objects within the size bound are eligable for guard pages.
-mi_decl_export void mi_heap_guarded_set_sample_rate(mi_heap_t* heap, size_t sample_rate, size_t seed);
-mi_decl_export void mi_heap_guarded_set_size_bound(mi_heap_t* heap, size_t min, size_t max);
 
 
 // experimental
diff --git a/include/mimalloc/internal.h b/include/mimalloc/internal.h
index a76f7baf..c9f69a26 100644
--- a/include/mimalloc/internal.h
+++ b/include/mimalloc/internal.h
@@ -127,6 +127,7 @@ mi_threadid_t _mi_thread_id(void) mi_attr_noexcept;
 size_t        _mi_thread_seq_id(void) mi_attr_noexcept;
 mi_tld_t*     _mi_thread_tld(void) mi_attr_noexcept;
 void          _mi_heap_guarded_init(mi_heap_t* heap);
+mi_heap_t*    _mi_heap_main_get(void);
 
 // os.c
 void          _mi_os_init(void);                                            // called from process init
diff --git a/src/init.c b/src/init.c
index 31b0d271..5bedab85 100644
--- a/src/init.c
+++ b/src/init.c
@@ -138,7 +138,7 @@ mi_decl_cache_align const mi_heap_t _mi_heap_empty = {
   MI_MEMID_STATIC
 };
 
-extern mi_heap_t heap_main;
+extern mi_decl_hidden mi_decl_cache_align mi_heap_t heap_main;
 
 static mi_decl_cache_align mi_tld_t tld_main = {
   0,                      // thread_id
@@ -266,7 +266,7 @@ static void mi_heap_main_init(void) {
   }
 }
 
-mi_heap_t* heap_main_get(void) {
+mi_heap_t* _mi_heap_main_get(void) {
   mi_heap_main_init();
   return &heap_main;
 }
@@ -602,6 +602,12 @@ void _mi_heap_set_default_direct(mi_heap_t* heap)  {
   _mi_prim_thread_associate_default_heap(heap);
 }
 
+void mi_thread_set_in_threadpool(void) mi_attr_noexcept {
+  mi_tld_t* tld = mi_tld();
+  if (tld!=NULL) { 
+    tld->is_in_threadpool = true;
+  }
+}
 
 // --------------------------------------------------------
 // Run functions on process init/done, and thread init/done
@@ -613,6 +619,11 @@ bool mi_decl_noinline _mi_preloading(void) {
   return os_preloading;
 }
 
+// Returns true if mimalloc was redirected
+mi_decl_nodiscard bool mi_is_redirected(void) mi_attr_noexcept {
+  return _mi_is_redirected();
+}
+
 // Called once by the process loader from `src/prim/prim.c`
 void _mi_process_load(void) {
   mi_heap_main_init();