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Normally, calling code:delete/1 before re-loading the code for a
module is unnecessary but causes no problem.
But there will be be problems if the new code has an on_load function.
Code with an on_load function will always be loaded as old code
to allowed it to be easily purged if the on_load function would fail.
If the on_load function succeeds, the old and current code will be
swapped.
So in the scenario where code:delete/1 has been called explicitly,
there is old code but no current code. Loading code with an
on_load function will cause the reference to the old code to be
overwritten. That will at best cause a memory leak, and at worst
an emulator crash (especially if NIFs are involved).
To avoid that situation, we will put the code with the on_load
function in a special, third slot in Module.
ERL-240
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* maint:
Fix restore of 'current' field when rescheduled NIF completes
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* maint:
Ensure correct mbuf_sz value in process structure
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* maint:
Fix tracing of processes executing dirty
Perform check_process_code while process is executing dirty
Fix purge of code
Reclaim literal area after purge has completed
Separate literal area from code
Conflicts:
erts/emulator/beam/global.h
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* rickard/ds-trace/OTP-13822:
Fix tracing of processes executing dirty
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This is needed in order for the heap to never contain
any pointers to invalid memory. This is good for performance
and debugging reasons.
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It has to be possible to send trace messages to a port
from non-schedulers threads (specifically from the
sys_msg_dispatcher).
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that would go undetected and cause havoc if module is purged.
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Dirty schedulers only execute NIFs, so having them execute the full
process_main function isn't necessary. Add dirty_process_main for
dirty schedulers to execute instead.
Add erts_pre_dirty_nif(), called when preparing to execute a dirty
nif.
Add more dirty NIF tests to verify that activities requiring the
process main lock can succeed when the process is executing a dirty
NIF.
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* mikpe/otp-19-erts-integer-truncation-bugs/PR-1045/OTP-13606:
erl_unicode.c: fix integer truncation problems
do not limit heap fragments to 4 giga-words
erts_new_mso_binary(): do not truncate len
Conflicts:
erts/emulator/beam/erl_nif.c
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* egil/erts/nif-format_term/OTP-13580:
runtime_tools: Change erts_snprintf to enif_snprintf
erts: Document enif_snprintf
erts: Add tests for enif_snprintf
erts: Add enif_snprintf
Conflicts:
erts/emulator/beam/erl_nif_api_funcs.h
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- Termination of a process...
- Modify trace flags of process...
- Process info on process...
- Register/unregister of name on process...
- Set group leader on process...
... while it is executing a dirty NIF.
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* Add the capability to format erlang terms to a char buffer in nifs.
* Bump NIF version to 2.11
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- struct erl_heap_fragment: use Uint for sizes
- erl_nif.c: use size_t for sizes
- erts_heap_frag_shrink(): remove now redundant cast
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All 'EXIT' and monitor messages are sent from 'system'
Timeouts are "sent" from 'clock_service'
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Load the module as old code; swap old and new code if the
-on_load function succeeds. That way, a failed update attempt
for a module that has an -on_load function will preserve the
previous version of the code.
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* egil/erts/tracing-support-lttng/OTP-13532: (28 commits)
runtime_tools: User's guide to LTTng and dyntrace
runtime_tools: Fix Dtrace build
erts: Fix gc messages in tracer_SUITE
erts: Fix gc messages in sensitive_SUITE
erts: Fix gc messages in trace_port_SUITE
tools: Update fprof tests
tools: Update fprof with new gc traces
runtime_tools: Update dyntrace_lttng_SUITE tests
runtime_tools: Add 'return_to' for call tracing
erts: Fix return_to trace callback
erts: Update erl_tracer documentation
erts: Fix erl_tracer documentation typos
Update preloaded erl_tracer.beam
erts: Update erl_tracer type specs
runtime_tools: Add lttng dyntrace tests
runtime_tools: Extend 'trace' and 'enabled' tracer callbacks
erts: Extend 'enabled' and 'trace' tracer callbacks
runtime_tools: Extend 'enabled' tracer callbacks
erts: Extend 'enabled' tracer callbacks
runtime_tools: Update lttng garbage collection trace
...
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Any heap fragment created during a nif call to a tracer nif
should be free'd immediately in order for the GC not to treat
it as live data.
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erts_block/unblock_fpe should only be called at entry to/exit from
native user code.
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This commit completes the tracing for processes so that
all messages sent by a process (via nifs or otherwise) will
be traced.
The commit also adds tracing of all types of events from ports.
When enabling tracing using erlang:trace, the 'all' flag now also
enables tracing on all ports.
OTP-13496
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Add the possibility to use modules as trace data receivers. The functions
in the module have to be nifs as otherwise complex trace probes will be
very hard to handle (complex means trace probes for ports for example).
This commit changes the way that the ptab->tracer field works from always
being an immediate, to now be NIL if no tracer is present or else be
the tuple {TracerModule, TracerState} where TracerModule is an atom that
is later used to lookup the appropriate tracer callbacks to call and
TracerState is just passed to the tracer callback. The default process and
port tracers have been rewritten to use the new API.
This commit also changes the order which trace messages are delivered to the
potential tracer process. Any enif_send done in a tracer module may be delayed
indefinitely because of lock order issues. If a message is delayed any other
trace message send from that process is also delayed so that order is preserved
for each traced entity. This means that for some trace events (i.e. send/receive)
the events may come in an unintuitive order (receive before send) to the
trace receiver. Timestamps are taken when the trace message is generated so
trace messages from differented processes may arrive with the timestamp
out of order.
Both the erlang:trace and seq_trace:set_system_tracer accept the new tracer
module tracers and also the backwards compatible arguments.
OTP-10267
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These are convinience functions for calling nifs from erts
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* lukas/erts/enif_send_null_env/OTP-13495:
erts: Add enif_send with NULL as msg env
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* henrik/update-copyrightyear:
update copyright-year
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This is an optimization for reducing the number of heap fragments
allocated when sending a message where the majority of the
message payload is on the sending process' heap.
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* lukas/erts/enif_trace_functions/OTP-13442:
erts: Fix bug in enif_send
erts: Fix windows nif port tests
erts: Fix bug in enif_term_to_binary
erts: Remove printout when dec_term fails in DEBUG
erts: Polish erl_nif docs
erts: Improve enif_binary_to_term
erts: Add enif_port_command
erts: Add enif_term_to_binary and enif_binary_to_term
erts: Add enif_is_process/port_alive
erts: Add enif_cpu/now_time and enif_make_unique_integer
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Let cache_env() set env->heap_frag to same as MBUF(p)
as it is in any other case.
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Wait until after dec_term and factory_close to do cache_env(),
otherwise we will cache the wrong state.
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* Accept a raw data buffer instead of ErlNifBinary
* Accept option ERL_NIF_BIN2TERM_SAFE
* Return number of read bytes
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This is mostly a pure refactoring.
Except for the buggy cases when calling erlang:halt() with a positive
integer in the range -(INT_MIN+2) to -INT_MIN that got confused with
ERTS_ABORT_EXIT, ERTS_DUMP_EXIT and ERTS_INTR_EXIT.
Outcome OLD erl_exit(n, ) NEW erts_exit(n, )
------- ------------------- -------------------------------------------
exit(Status) n = -Status <= 0 n = Status >= 0
crashdump+abort n > 0, ignore n n = ERTS_ERROR_EXIT < 0
The outcome of the old ERTS_ABORT_EXIT, ERTS_INTR_EXIT and
ERTS_DUMP_EXIT are the same as before (even though their values have
changed).
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* sverk/fix-list-length-int/OTP-13288:
erts: Fix error cases in enif_get_list_length
erts: Use Sint instead of int for list lengths
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