diff options
Diffstat (limited to 'erts/emulator/beam/erl_port.h')
-rw-r--r-- | erts/emulator/beam/erl_port.h | 154 |
1 files changed, 85 insertions, 69 deletions
diff --git a/erts/emulator/beam/erl_port.h b/erts/emulator/beam/erl_port.h index 65b4cd0bfe..377aa72ed5 100644 --- a/erts/emulator/beam/erl_port.h +++ b/erts/emulator/beam/erl_port.h @@ -1,7 +1,7 @@ /* * %CopyrightBegin% * - * Copyright Ericsson AB 2012. All Rights Reserved. + * Copyright Ericsson AB 2012-2013. All Rights Reserved. * * The contents of this file are subject to the Erlang Public License, * Version 1.1, (the "License"); you may not use this file except in @@ -31,7 +31,18 @@ typedef struct ErtsProc2PortSigData_ ErtsProc2PortSigData; #include "erl_thr_progress.h" #include "erl_trace.h" +#ifndef __WIN32__ #define ERTS_DEFAULT_MAX_PORTS (1 << 16) +#else +/* + * Do not default to as many max ports on Windows + * as there are no os limits to stop system + * from running amok. If allowed to go too high + * windows rarely recovers from the errors and + * other OS processes can be effected. + */ +#define ERTS_DEFAULT_MAX_PORTS (1 << 13) +#endif /* __WIN32__ */ #define ERTS_MIN_PORTS 1024 extern int erts_port_synchronous_ops; @@ -40,7 +51,29 @@ 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 { @@ -153,6 +186,7 @@ struct _erl_drv_port { ErlDrvPDL port_data_lock; ErtsPrtSD *psd; /* Port specific data */ + int reds; /* Only used while executing driver callbacks */ }; #define ERTS_PORT_GET_CONNECTED(PRT) \ @@ -429,16 +463,16 @@ 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 +654,72 @@ 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; |