diff --git a/api/gc-api.h b/api/gc-api.h
index e34e0d57e..502a6abe2 100644
--- a/api/gc-api.h
+++ b/api/gc-api.h
@@ -301,4 +301,17 @@ static inline void gc_safepoint(struct gc_mutator *mut) {
     gc_safepoint_slow(mut);
 }
 
+GC_API_ void gc_safepoint_signal_inhibit(struct gc_mutator *mut);
+GC_API_ void gc_safepoint_signal_reallow(struct gc_mutator *mut);
+
+static inline void gc_inhibit_preemption(struct gc_mutator *mut) {
+  if (gc_safepoint_mechanism() == GC_SAFEPOINT_MECHANISM_SIGNAL)
+    gc_safepoint_signal_inhibit(mut);
+}
+
+static inline void gc_reallow_preemption(struct gc_mutator *mut) {
+  if (gc_safepoint_mechanism() == GC_SAFEPOINT_MECHANISM_SIGNAL)
+    gc_safepoint_signal_reallow(mut);
+}
+
 #endif // GC_API_H_
diff --git a/src/bdw.c b/src/bdw.c
index e6b3f4ef5..e9268ef81 100644
--- a/src/bdw.c
+++ b/src/bdw.c
@@ -203,6 +203,13 @@ void gc_write_barrier_slow(struct gc_mutator *mut, struct gc_ref obj,
 int* gc_safepoint_flag_loc(struct gc_mutator *mut) { GC_CRASH(); }
 void gc_safepoint_slow(struct gc_mutator *mut) { GC_CRASH(); }
 
+void gc_safepoint_signal_inhibit(struct gc_mutator *mut) {
+  GC_alloc_lock();
+}
+void gc_safepoint_signal_reallow(struct gc_mutator *mut) {
+  GC_alloc_unlock();
+}
+
 struct bdw_mark_state {
   struct GC_ms_entry *mark_stack_ptr;
   struct GC_ms_entry *mark_stack_limit;
diff --git a/src/mmc.c b/src/mmc.c
index 1ae342f5e..f67621b93 100644
--- a/src/mmc.c
+++ b/src/mmc.c
@@ -869,6 +869,9 @@ gc_safepoint_slow(struct gc_mutator *mut) {
   heap_unlock(heap);
 }
 
+void gc_safepoint_signal_inhibit(struct gc_mutator *mut) { GC_CRASH(); }
+void gc_safepoint_signal_reallow(struct gc_mutator *mut) { GC_CRASH(); }
+
 static enum gc_trace_kind
 compute_trace_kind(enum gc_allocation_kind kind) {
   if (GC_CONSERVATIVE_TRACE) {
diff --git a/src/pcc.c b/src/pcc.c
index 6b656360c..bda42730b 100644
--- a/src/pcc.c
+++ b/src/pcc.c
@@ -1081,6 +1081,9 @@ void gc_safepoint_slow(struct gc_mutator *mut) {
   heap_unlock(heap);
 }
   
+void gc_safepoint_signal_inhibit(struct gc_mutator *mut) { GC_CRASH(); }
+void gc_safepoint_signal_reallow(struct gc_mutator *mut) { GC_CRASH(); }
+
 struct gc_ephemeron* gc_allocate_ephemeron(struct gc_mutator *mut) {
   return gc_allocate(mut, gc_ephemeron_size(), GC_ALLOCATION_TAGGED);
 }
diff --git a/src/semi.c b/src/semi.c
index 9754b3fa2..41c78a178 100644
--- a/src/semi.c
+++ b/src/semi.c
@@ -487,6 +487,8 @@ void gc_write_barrier_slow(struct gc_mutator *mut, struct gc_ref obj,
 
 int* gc_safepoint_flag_loc(struct gc_mutator *mut) { GC_CRASH(); }
 void gc_safepoint_slow(struct gc_mutator *mut) { GC_CRASH(); }
+void gc_safepoint_signal_inhibit(struct gc_mutator *mut) { GC_CRASH(); }
+void gc_safepoint_signal_reallow(struct gc_mutator *mut) { GC_CRASH(); }
   
 static int collect_for_large_alloc(struct gc_mutator *mut, size_t npages) {
   size_t bytes = npages * mutator_semi_space(mut)->page_size;