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authorRickard Green <rickard@erlang.org>2013-02-09 13:45:43 +0100
committerRickard Green <rickard@erlang.org>2013-02-13 12:22:56 +0100
commit69b00e333d7759ab641a53cedf4d13f1919fb00b (patch)
tree9bf3b232c23a8932ae6496ab63da834db9cb31fb /erts/emulator/beam/erl_port.h
parent9acad61e2bfa3e281e5e17e087811c8b1006165f (diff)
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Fix driver port accesses
Diffstat (limited to 'erts/emulator/beam/erl_port.h')
-rw-r--r--erts/emulator/beam/erl_port.h140
1 files changed, 72 insertions, 68 deletions
diff --git a/erts/emulator/beam/erl_port.h b/erts/emulator/beam/erl_port.h
index 65b4cd0bfe..a971685d7b 100644
--- a/erts/emulator/beam/erl_port.h
+++ b/erts/emulator/beam/erl_port.h
@@ -40,7 +40,29 @@ extern int erts_port_parallelism;
typedef struct erts_driver_t_ erts_driver_t;
-#define ERTS_INVALID_ERL_DRV_PORT ((ErlDrvPort) (SWord) -1)
+/*
+ * It would have been preferred to use NULL as value of
+ * ERTS_INVALID_ERL_DRV_PORT. That would, however, not be
+ * backward compatible. In pre-R16 systems, 0 was a valid
+ * port handle and -1 was used as invalid handle, so we
+ * are stuck with it.
+ */
+#define ERTS_INVALID_ERL_DRV_PORT ((struct _erl_drv_port *) ((SWord) -1))
+#ifdef DEBUG
+/* Make sure we use this api, and do not cast directly */
+#define ERTS_ErlDrvPort2Port(PH) \
+ ((PH) == ERTS_INVALID_ERL_DRV_PORT \
+ ? ERTS_INVALID_ERL_DRV_PORT \
+ : ((Port *) ((PH) - 4711)))
+#define ERTS_Port2ErlDrvPort(PH) \
+ ((PH) == ERTS_INVALID_ERL_DRV_PORT \
+ ? ERTS_INVALID_ERL_DRV_PORT \
+ : ((ErlDrvPort) ((PH) + 4711)))
+#else
+#define ERTS_ErlDrvPort2Port(PH) ((Port *) (PH))
+#define ERTS_Port2ErlDrvPort(PH) ((ErlDrvPort) (PH))
+#endif
+
#define SMALL_IO_QUEUE 5 /* Number of fixed elements */
typedef struct {
@@ -429,16 +451,16 @@ ERTS_GLB_INLINE void erts_port_release(Port *);
ERTS_GLB_INLINE Port *erts_thr_id2port_sflgs(Eterm id, Uint32 invalid_sflgs);
ERTS_GLB_INLINE void erts_thr_port_release(Port *prt);
#endif
-ERTS_GLB_INLINE Port *erts_thr_drvport2port_raw(ErlDrvPort, int);
-ERTS_GLB_INLINE Port *erts_drvport2port_raw(ErlDrvPort drvport);
-ERTS_GLB_INLINE Port *erts_drvport2port(ErlDrvPort, erts_aint32_t *);
-ERTS_GLB_INLINE Port *erts_drvportid2port(Eterm);
+ERTS_GLB_INLINE Port *erts_thr_drvport2port(ErlDrvPort, int);
+ERTS_GLB_INLINE Port *erts_drvport2port_state(ErlDrvPort, erts_aint32_t *);
ERTS_GLB_INLINE Eterm erts_drvport2id(ErlDrvPort);
ERTS_GLB_INLINE Uint32 erts_portid2status(Eterm);
ERTS_GLB_INLINE int erts_is_port_alive(Eterm);
ERTS_GLB_INLINE int erts_is_valid_tracer_port(Eterm);
ERTS_GLB_INLINE int erts_port_driver_callback_epilogue(Port *, erts_aint32_t *);
+#define erts_drvport2port(Prt) erts_drvport2port_state((Prt), NULL)
+
#if ERTS_GLB_INLINE_INCL_FUNC_DEF
ERTS_GLB_INLINE Port *erts_pix2port(int ix)
@@ -620,90 +642,72 @@ erts_thr_port_release(Port *prt)
#endif
-ERTS_GLB_INLINE Port*
-erts_thr_drvport2port_raw(ErlDrvPort drvport, int lock_pdl)
+ERTS_GLB_INLINE Port *
+erts_thr_drvport2port(ErlDrvPort drvport, int lock_pdl)
{
+ Port *prt = ERTS_ErlDrvPort2Port(drvport);
+ ASSERT(prt != NULL);
+ if (prt == ERTS_INVALID_ERL_DRV_PORT)
+ return ERTS_INVALID_ERL_DRV_PORT;
+
+ if (lock_pdl && prt->port_data_lock)
+ driver_pdl_lock(prt->port_data_lock);
+
#if ERTS_ENABLE_LOCK_CHECK
- int emu_thread = erts_lc_is_emu_thr();
-#endif
- if (drvport == ERTS_INVALID_ERL_DRV_PORT)
- return NULL;
- else {
- Port *prt = (Port *) drvport;
- if (lock_pdl && prt->port_data_lock)
- driver_pdl_lock(prt->port_data_lock);
-#if ERTS_ENABLE_LOCK_CHECK
- if (!ERTS_IS_CRASH_DUMPING) {
- if (emu_thread) {
- ERTS_SMP_LC_ASSERT(erts_lc_is_port_locked(prt));
- ERTS_LC_ASSERT(!prt->port_data_lock
- || erts_lc_mtx_is_locked(&prt->port_data_lock->mtx));
- }
- else {
- ERTS_LC_ASSERT(prt->port_data_lock);
- ERTS_LC_ASSERT(erts_lc_mtx_is_locked(&prt->port_data_lock->mtx));
- }
+ if (!ERTS_IS_CRASH_DUMPING) {
+ if (erts_lc_is_emu_thr()) {
+ ERTS_SMP_LC_ASSERT(erts_lc_is_port_locked(prt));
+ ERTS_LC_ASSERT(!prt->port_data_lock
+ || erts_lc_mtx_is_locked(&prt->port_data_lock->mtx));
+ }
+ else {
+ ERTS_LC_ASSERT(prt->port_data_lock);
+ ERTS_LC_ASSERT(erts_lc_mtx_is_locked(&prt->port_data_lock->mtx));
}
-#endif
- return prt;
}
-}
+#endif
-ERTS_GLB_INLINE Port*
-erts_drvport2port_raw(ErlDrvPort drvport)
-{
- ERTS_LC_ASSERT(erts_lc_is_emu_thr());
- if (drvport == ERTS_INVALID_ERL_DRV_PORT)
- return NULL;
- else {
- Port *prt = (Port *) drvport;
- ERTS_SMP_LC_ASSERT(erts_lc_is_port_locked(prt)
- || ERTS_IS_CRASH_DUMPING);
- return prt;
+ if (erts_atomic32_read_nob(&prt->state)
+ & ERTS_PORT_SFLGS_INVALID_DRIVER_LOOKUP) {
+ if (lock_pdl && prt->port_data_lock)
+ driver_pdl_unlock(prt->port_data_lock);
+ return ERTS_INVALID_ERL_DRV_PORT;
}
-}
-
-ERTS_GLB_INLINE Port*
-erts_drvport2port(ErlDrvPort drvport, erts_aint32_t *statep)
-{
- Port *prt = erts_drvport2port_raw(drvport);
- erts_aint32_t state;
- if (!prt)
- return NULL;
- state = erts_atomic32_read_nob(&prt->state);
- if (state & ERTS_PORT_SFLGS_INVALID_DRIVER_LOOKUP)
- return NULL;
- if (statep)
- *statep = state;
return prt;
}
-ERTS_GLB_INLINE Port*
-erts_drvportid2port(Eterm id)
+ERTS_GLB_INLINE Port *
+erts_drvport2port_state(ErlDrvPort drvport, erts_aint32_t *statep)
{
- Port *prt;
+ Port *prt = ERTS_ErlDrvPort2Port(drvport);
erts_aint32_t state;
- if (is_not_internal_port(id))
- return NULL;
- prt = (Port *) erts_ptab_pix2intptr_nob(&erts_port,
- internal_port_index(id));
- if (!prt)
- return NULL;
+ ASSERT(prt);
+ ERTS_LC_ASSERT(erts_lc_is_emu_thr());
+ if (prt == ERTS_INVALID_ERL_DRV_PORT)
+ return ERTS_INVALID_ERL_DRV_PORT;
ERTS_SMP_LC_ASSERT(erts_lc_is_port_locked(prt)
|| ERTS_IS_CRASH_DUMPING);
- if (prt->common.id != id)
- return NULL;
+ /*
+ * This state check is only needed since a driver callback
+ * might terminate the port, and then call back into the
+ * emulator. Drivers should preferably have been forbidden
+ * to call into the emulator after terminating the port,
+ * but it has been like this for ages. Perhaps forbid this
+ * in some future major release?
+ */
state = erts_atomic32_read_nob(&prt->state);
if (state & ERTS_PORT_SFLGS_INVALID_DRIVER_LOOKUP)
- return NULL;
+ return ERTS_INVALID_ERL_DRV_PORT;
+ if (statep)
+ *statep = state;
return prt;
}
ERTS_GLB_INLINE Eterm
erts_drvport2id(ErlDrvPort drvport)
{
- Port *prt = erts_drvport2port_raw(drvport);
- if (!prt)
+ Port *prt = erts_drvport2port(drvport);
+ if (prt == ERTS_INVALID_ERL_DRV_PORT)
return am_undefined;
else
return prt->common.id;