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proc_lib(3erl) Erlang Module Definition proc_lib(3erl)
NAME
proc_lib - Functions for asynchronous and synchronous start of processes adhering to the OTP design principles.
DESCRIPTION
This module is used to start processes adhering to the OTP Design Principles . Specifically, the functions in this module are used by the
OTP standard behaviors ( gen_server , gen_fsm , ...) when starting new processes. The functions can also be used to start special processes
, user defined processes which comply to the OTP design principles. See Sys and Proc_Lib in OTP Design Principles for an example.
Some useful information is initialized when a process starts. The registered names, or the process identifiers, of the parent process, and
the parent ancestors, are stored together with information about the function initially called in the process.
While in "plain Erlang" a process is said to terminate normally only for the exit reason normal , a process started using proc_lib is also
said to terminate normally if it exits with reason shutdown or {shutdown,Term} . shutdown is the reason used when an application (supervi-
sion tree) is stopped.
When a process started using proc_lib terminates abnormally -- that is, with another exit reason than normal , shutdown , or {shut-
down,Term} -- a crash report is generated, which is written to terminal by the default SASL event handler. That is, the crash report is
normally only visible if the SASL application is started. See sasl(7) and SASL User's Guide .
The crash report contains the previously stored information such as ancestors and initial function, the termination reason, and information
regarding other processes which terminate as a result of this process terminating.
EXPORTS
spawn(Fun) -> pid()
spawn(Node, Fun) -> pid()
spawn(Module, Function, Args) -> pid()
spawn(Node, Module, Function, Args) -> pid()
Types Node = node()
Fun = fun() -> void()
Module = Function = atom()
Args = [term()]
Spawns a new process and initializes it as described above. The process is spawned using the spawn BIFs.
spawn_link(Fun) -> pid()
spawn_link(Node, Fun) -> pid()
spawn_link(Module, Function, Args) -> pid()
spawn_link(Node, Module, Function, Args) -> pid()
Types Node = node()
Fun = fun() -> void()
Module = Function = atom()
Args = [term()]
Spawns a new process and initializes it as described above. The process is spawned using the spawn_link BIFs.
spawn_opt(Fun, SpawnOpts) -> pid()
spawn_opt(Node, Fun, SpawnOpts) -> pid()
spawn_opt(Module, Function, Args, SpawnOpts) -> pid()
spawn_opt(Node, Module, Func, Args, SpawnOpts) -> pid()
Types Node = node()
Fun = fun() -> void()
Module = Function = atom()
Args = [term()]
SpawnOpts -- see erlang:spawn_opt/2,3,4,5
Spawns a new process and initializes it as described above. The process is spawned using the spawn_opt BIFs.
Note:
Using the spawn option monitor is currently not allowed, but will cause the function to fail with reason badarg .
start(Module, Function, Args) -> Ret
start(Module, Function, Args, Time) -> Ret
start(Module, Function, Args, Time, SpawnOpts) -> Ret
start_link(Module, Function, Args) -> Ret
start_link(Module, Function, Args, Time) -> Ret
start_link(Module, Function, Args, Time, SpawnOpts) -> Ret
Types Module = Function = atom()
Args = [term()]
Time = int() >= 0 | infinity
SpawnOpts -- see erlang:spawn_opt/2,3,4,5
Ret = term() | {error, Reason}
Starts a new process synchronously. Spawns the process and waits for it to start. When the process has started, it must call
init_ack(Parent,Ret) or init_ack(Ret) , where Parent is the process that evaluates this function. At this time, Ret is returned.
If the start_link/3,4,5 function is used and the process crashes before it has called init_ack/1,2 , {error, Reason} is returned if
the calling process traps exits.
If Time is specified as an integer, this function waits for Time milliseconds for the new process to call init_ack , or {error,
timeout} is returned, and the process is killed.
The SpawnOpts argument, if given, will be passed as the last argument to the spawn_opt/2,3,4,5 BIF.
Note:
Using the spawn option monitor is currently not allowed, but will cause the function to fail with reason badarg .
init_ack(Parent, Ret) -> void()
init_ack(Ret) -> void()
Types Parent = pid()
Ret = term()
This function must used by a process that has been started by a start[_link]/3,4,5 function. It tells Parent that the process has
initialized itself, has started, or has failed to initialize itself.
The init_ack/1 function uses the parent value previously stored by the start function used.
If this function is not called, the start function will return an error tuple (if a link and/or a timeout is used) or hang other-
wise.
The following example illustrates how this function and proc_lib:start_link/3 are used.
-module(my_proc).
-export([start_link/0]).
-export([init/1]).
start_link() ->
proc_lib:start_link(my_proc, init, [self()]).
init(Parent) ->
case do_initialization() of
ok ->
proc_lib:init_ack(Parent, {ok, self()});
{error, Reason} ->
exit(Reason)
end,
loop().
format(CrashReport) -> string()
Types CrashReport = term()
This function can be used by a user defined event handler to format a crash report. The crash report is sent using error_log-
ger:error_report(crash_report, CrashReport) . That is, the event to be handled is of the format {error_report, GL, {Pid,
crash_report, CrashReport}} where GL is the group leader pid of the process Pid which sent the crash report.
initial_call(Process) -> {Module,Function,Args} | false
Types Process = pid() | {X,Y,Z} | ProcInfo
X = Y = Z = int()
ProcInfo = term()
Module = Function = atom()
Args = [atom()]
Extracts the initial call of a process that was started using one of the spawn or start functions described above. Process can
either be a pid, an integer tuple (from which a pid can be created), or the process information of a process Pid fetched through an
erlang:process_info(Pid) function call.
Note:
The list Args no longer contains the actual arguments, but the same number of atoms as the number of arguments; the first atom is always
'Argument__1' , the second 'Argument__2' , and so on. The reason is that the argument list could waste a significant amount of memory, and
if the argument list contained funs, it could be impossible to upgrade the code for the module.
If the process was spawned using a fun, initial_call/1 no longer returns the actual fun, but the module, function for the local function
implementing the fun, and the arity, for instance {some_module,-work/3-fun-0-,0} (meaning that the fun was created in the function
some_module:work/3 ). The reason is that keeping the fun would prevent code upgrade for the module, and that a significant amount of memory
could be wasted.
translate_initial_call(Process) -> {Module,Function,Arity} | Fun
Types Process = pid() | {X,Y,Z} | ProcInfo
X = Y = Z = int()
ProcInfo = term()
Module = Function = atom()
Arity = int()
Fun = fun() -> void()
This function is used by the c:i/0 and c:regs/0 functions in order to present process information.
Extracts the initial call of a process that was started using one of the spawn or start functions described above, and translates it
to more useful information. Process can either be a pid, an integer tuple (from which a pid can be created), or the process informa-
tion of a process Pid fetched through an erlang:process_info(Pid) function call.
If the initial call is to one of the system defined behaviors such as gen_server or gen_event , it is translated to more useful
information. If a gen_server is spawned, the returned Module is the name of the callback module and Function is init (the function
that initiates the new server).
A supervisor and a supervisor_bridge are also gen_server processes. In order to return information that this process is a supervisor
and the name of the call-back module, Module is supervisor and Function is the name of the supervisor callback module. Arity is 1
since the init/1 function is called initially in the callback module.
By default, {proc_lib,init_p,5} is returned if no information about the initial call can be found. It is assumed that the caller
knows that the process has been spawned with the proc_lib module.
hibernate(Module, Function, Args)
Types Module = Function = atom()
Args = [term()]
This function does the same as (and does call) the BIF hibernate/3 , but ensures that exception handling and logging continues to
work as expected when the process wakes up. Always use this function instead of the BIF for processes started using proc_lib func-
tions.
SEE ALSO
error_logger(3erl)
Ericsson AB stdlib 1.17.3 proc_lib(3erl)