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A process requesting a system task to be executed in the context of
another process will be notified by a message when the task has
executed. This message will be on the form:
{RequestType, RequestId, Pid, Result}.
A process requesting a system task to be executed can set priority
on the system task. The requester typically set the same priority
on the task as its own process priority, and by this avoiding
priority inversion. A request for execution of a system task is
made by calling the statically linked in NIF
erts_internal:request_system_task(Pid, Prio, Request). This is an
undocumented ERTS internal function that should remain so. It
should *only* be called from BIF implementations.
Currently defined system tasks are:
* garbage_collect
* check_process_code
Further system tasks can and will be implemented in the future.
The erlang:garbage_collect/[1,2] and erlang:check_process_code/[2,3]
BIFs are now implemented using system tasks. Both the
'garbage_collect' and the 'check_process_code' operations perform
or may perform garbage_collections. By doing these via the
system task functionality all garbage collect operations in the
system will be performed solely in the context of the process
being garbage collected. This makes it possible to later implement
functionality for disabling garbage collection of a process over
context switches.
Newly introduced BIFs:
* erlang:garbage_collect/2 - The new second argument is an option
list. Introduced option:
* {async, RequestId} - making it possible for users to issue
asynchronous garbage collect requests.
* erlang:check_process_code/3 - The new third argument is an
option list. Introduced options:
* {async, RequestId} - making it possible for users to issue
asynchronous check process code requests.
* {allow_gc, boolean()} - making it possible to issue requests
that aren't allowed to garbage collect (operation will abort
if gc should be needed).
These options have been introduced as a preparation for
parallelization of check_process_code operations when the
code_server is about to purge a module.
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Conflicts:
bootstrap/lib/kernel/ebin/os.beam
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Conflicts:
bootstrap/lib/kernel/ebin/hipe_unified_loader.beam
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Conflicts:
bootstrap/lib/stdlib/ebin/beam_lib.beam
lib/public_key/test/erl_make_certs.erl
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* maint:
Update primary bootstrap
Fix broken building of bootstrap compiler
Conflicts:
bootstrap/lib/kernel/ebin/code.beam
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* maint:
Update primary bootstrap
sys_pre_expand: Eliminate bottleneck for modules with many functions
Conflicts:
bootstrap/bin/start.boot
bootstrap/bin/start_clean.boot
bootstrap/lib/kernel/ebin/file.beam
bootstrap/lib/kernel/ebin/hipe_unified_loader.beam
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* maint:
Update primary bootstrap
v3_life: Use common code for guards and bodies
v3_core: Don't put negative line numbers in annotations
v3_kernel: Dig out the line number only when generating a warning
v3_kernel: Clean up handling of guards
v3_kernel: Introduce is_in_guard/1
v3_kernel: Removed unreached clause for #k_bin_int{} in sub_size_var/1
v3_kernel: Remove unreached handling of #k_bin_int{} in arg_con/1
v3_codegen: Eliminate the special case of 'put' without destination
v3_kernel: Don't attempt to share identical literals
v3_kernel: Handle sequences in guards
v3_kernel: Remove clauses that are never executed in arg_val/1
v3_kernel.hrl: Remove unused record #k_string{}
v3_kernel.erl: Remove unused define of EXPENSIVE_BINARY_LIMIT
sys_core_fold: Refactor previous_ctx_to_binary/2 to cover it completely
sys_core_fold: Fix opt_guard_try/1
sys_core_fold: Simplify opt_bool_not() to cover it completely
sys_core_fold: Remove duplicate optimization
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