diff options
Diffstat (limited to 'erts/emulator/beam/erl_bif_port.c')
-rw-r--r-- | erts/emulator/beam/erl_bif_port.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/erts/emulator/beam/erl_bif_port.c b/erts/emulator/beam/erl_bif_port.c index ff03151619..d05507118e 100644 --- a/erts/emulator/beam/erl_bif_port.c +++ b/erts/emulator/beam/erl_bif_port.c @@ -647,6 +647,27 @@ BIF_RETTYPE port_get_data_1(BIF_ALIST_1) BIF_RET(res); } +Eterm erts_port_data_read(Port* prt) +{ + Eterm res; + erts_aint_t data; + + data = erts_smp_atomic_read_ddrb(&prt->data); + if (data == (erts_aint_t)NULL) + return am_undefined; /* Port terminated by racing thread */ + + if ((data & 0x3) != 0) { + res = (Eterm) (UWord) data; + ASSERT(is_immed(res)); + } + else { + ErtsPortDataHeap *pdhp = (ErtsPortDataHeap *) data; + res = pdhp->data; + } + return res; +} + + /* * Open a port. Most of the work is not done here but rather in * the file io.c. |