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Diffstat (limited to 'erts/emulator/sys/common/erl_check_io.c')
-rw-r--r--erts/emulator/sys/common/erl_check_io.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/erts/emulator/sys/common/erl_check_io.c b/erts/emulator/sys/common/erl_check_io.c
index e367087455..80e8030d74 100644
--- a/erts/emulator/sys/common/erl_check_io.c
+++ b/erts/emulator/sys/common/erl_check_io.c
@@ -44,7 +44,7 @@
#include "erl_time.h"
#if 0
-#define DEBUG_PRINT(FMT, ...) erts_printf(FMT "\r\n", ##__VA_ARGS__)
+#define DEBUG_PRINT(FMT, ...) do { erts_printf(FMT "\r\n", ##__VA_ARGS__); fflush(stdout); } while(0)
#define DEBUG_PRINT_FD(FMT, STATE, ...) \
DEBUG_PRINT("%d: " FMT " (ev=%s, ac=%s, flg=%s)", \
(STATE) ? (STATE)->fd : (ErtsSysFdType)-1, ##__VA_ARGS__, \
@@ -1181,6 +1181,7 @@ enif_select_x(ErlNifEnv* env,
if (on) {
const Eterm recipient = pid ? pid->pid : env->proc->common.id;
+ ASSERT(is_internal_pid(recipient));
if (!state->driver.nif)
state->driver.nif = alloc_nif_select_data();
if (state->type == ERTS_EV_TYPE_NONE) {