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-rw-r--r--erts/emulator/beam/erl_process_lock.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/erts/emulator/beam/erl_process_lock.h b/erts/emulator/beam/erl_process_lock.h
index 2cccf0697a..e7d68f0a09 100644
--- a/erts/emulator/beam/erl_process_lock.h
+++ b/erts/emulator/beam/erl_process_lock.h
@@ -219,6 +219,10 @@ typedef struct erts_proc_lock_t_ {
#define ERTS_PROC_LOCKS_ALL_MINOR (ERTS_PROC_LOCKS_ALL \
& ~ERTS_PROC_LOCK_MAIN)
+/* All locks we first must unlock to lock L */
+#define ERTS_PROC_LOCKS_HIGHER_THAN(L) \
+ (ERTS_PROC_LOCKS_ALL & (~(L) & ~((L)-1)))
+
#define ERTS_PIX_LOCKS_BITS 10
#define ERTS_NO_OF_PIX_LOCKS (1 << ERTS_PIX_LOCKS_BITS)