author | wenzelm |
Mon, 19 Feb 2018 11:13:25 +0100 | |
changeset 67659 | 11b390e971f6 |
parent 64563 | 20e361014f55 |
child 68025 | 7fb7a6366a40 |
permissions | -rw-r--r-- |
62508
d0b68218ea55
discontinued RAW session: bootstrap directly from isabelle_process RAW_ML_SYSTEM;
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parents:
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(* Title: Pure/Concurrent/multithreading.ML |
24690
c661dae1070a
renamed ML-Systems/multithreading_dummy.ML to ML-Systems/multithreading.ML;
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Author: Makarius |
c661dae1070a
renamed ML-Systems/multithreading_dummy.ML to ML-Systems/multithreading.ML;
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62359 | 4 |
Multithreading in Poly/ML (cf. polyml/basis/Thread.sml). |
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c661dae1070a
renamed ML-Systems/multithreading_dummy.ML to ML-Systems/multithreading.ML;
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parents:
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*) |
c661dae1070a
renamed ML-Systems/multithreading_dummy.ML to ML-Systems/multithreading.ML;
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parents:
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c661dae1070a
renamed ML-Systems/multithreading_dummy.ML to ML-Systems/multithreading.ML;
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signature MULTITHREADING = |
c661dae1070a
renamed ML-Systems/multithreading_dummy.ML to ML-Systems/multithreading.ML;
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sig |
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val max_threads: unit -> int |
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val max_threads_update: int -> unit |
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val enabled: unit -> bool |
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val relevant: 'a list -> bool |
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val sync_wait: Time.time option -> ConditionVar.conditionVar -> Mutex.mutex -> bool Exn.result |
39616
8052101883c3
renamed setmp_noncritical to Unsynchronized.setmp to emphasize its meaning;
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val trace: int ref |
32295
400cc493d466
renamed Multithreading.regular_interrupts to Multithreading.public_interrupts;
wenzelm
parents:
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val tracing: int -> (unit -> string) -> unit |
400cc493d466
renamed Multithreading.regular_interrupts to Multithreading.public_interrupts;
wenzelm
parents:
32286
diff
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16 |
val tracing_time: bool -> Time.time -> (unit -> string) -> unit |
59054
61b723761dff
load simple_thread.ML later, such that it benefits from redefined print_exception_trace;
wenzelm
parents:
54717
diff
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17 |
val synchronized: string -> Mutex.mutex -> (unit -> 'a) -> 'a |
24690
c661dae1070a
renamed ML-Systems/multithreading_dummy.ML to ML-Systems/multithreading.ML;
wenzelm
parents:
diff
changeset
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end; |
c661dae1070a
renamed ML-Systems/multithreading_dummy.ML to ML-Systems/multithreading.ML;
wenzelm
parents:
diff
changeset
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|
c661dae1070a
renamed ML-Systems/multithreading_dummy.ML to ML-Systems/multithreading.ML;
wenzelm
parents:
diff
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structure Multithreading: MULTITHREADING = |
c661dae1070a
renamed ML-Systems/multithreading_dummy.ML to ML-Systems/multithreading.ML;
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parents:
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struct |
c661dae1070a
renamed ML-Systems/multithreading_dummy.ML to ML-Systems/multithreading.ML;
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parents:
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62925 | 23 |
(* max_threads *) |
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||
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local |
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fun num_processors () = |
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(case Thread.numPhysicalProcessors () of |
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SOME n => n |
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| NONE => Thread.numProcessors ()); |
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||
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fun max_threads_result m = |
62926
9ff9bcbc2341
virtual Pure is single-threaded to avoid confusion with multiple thread farms etc.;
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33 |
if Thread_Data.is_virtual then 1 |
9ff9bcbc2341
virtual Pure is single-threaded to avoid confusion with multiple thread farms etc.;
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parents:
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else if m > 0 then m |
9ff9bcbc2341
virtual Pure is single-threaded to avoid confusion with multiple thread farms etc.;
wenzelm
parents:
62925
diff
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|
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else Int.min (Int.max (num_processors (), 1), 8); |
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val max_threads_state = ref 1; |
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||
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in |
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32286
1fb5db48002d
added Multithreading.sync_wait, which turns enabled interrupts to sync ones, to ensure that wait will reaquire its lock when interrupted;
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fun max_threads () = ! max_threads_state; |
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fun max_threads_update m = max_threads_state := max_threads_result m; |
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fun enabled () = max_threads () > 1; |
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val relevant = (fn [] => false | [_] => false | _ => enabled ()); |
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end; |
28187
4062882c7df3
proper values of no_interrupts, regular_interrupts;
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parents:
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48 |
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62359 | 49 |
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(* synchronous wait *) |
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41713
a21084741b37
added Multithreading.interrupted (cf. java.lang.Thread.interrupted);
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51 |
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64276 | 52 |
fun sync_wait time cond lock = |
62923 | 53 |
Thread_Attributes.with_attributes |
64557
37074e22e8be
more tight thread attributes, based in internal word arithmetic instead of symbolic datatypes: measurable performance improvement;
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parents:
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(Thread_Attributes.sync_interrupts (Thread_Attributes.get_attributes ())) |
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(fn _ => |
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(case time of |
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SOME t => Exn.Res (ConditionVar.waitUntil (cond, lock, t)) |
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| NONE => (ConditionVar.wait (cond, lock); Exn.Res true)) |
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handle exn => Exn.Exn exn); |
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32295
400cc493d466
renamed Multithreading.regular_interrupts to Multithreading.public_interrupts;
wenzelm
parents:
32286
diff
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60 |
|
400cc493d466
renamed Multithreading.regular_interrupts to Multithreading.public_interrupts;
wenzelm
parents:
32286
diff
changeset
|
61 |
|
400cc493d466
renamed Multithreading.regular_interrupts to Multithreading.public_interrupts;
wenzelm
parents:
32286
diff
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|
62 |
(* tracing *) |
30612
cb6421b6a18f
future_job: do not inherit attributes, but enforce restricted interrupts -- attempt to prevent interrupt race conditions;
wenzelm
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diff
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62359 | 64 |
val trace = ref 0; |
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||
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fun tracing level msg = |
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64562 | 67 |
if ! trace < level then () |
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else Thread_Attributes.uninterruptible (fn _ => fn () => |
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(TextIO.output (TextIO.stdErr, (">>> " ^ msg () ^ "\n")); TextIO.flushOut TextIO.stdErr) |
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handle _ (*sic*) => ()) (); |
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||
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fun tracing_time detailed time = |
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tracing |
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(if not detailed then 5 |
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else if time >= seconds 1.0 then 1 |
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else if time >= seconds 0.1 then 2 |
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else if time >= seconds 0.01 then 3 |
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else if time >= seconds 0.001 then 4 else 5); |
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59180
c0fa3b3bdabd
discontinued central critical sections: NAMED_CRITICAL / CRITICAL;
wenzelm
parents:
59054
diff
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81 |
(* synchronized evaluation *) |
24690
c661dae1070a
renamed ML-Systems/multithreading_dummy.ML to ML-Systems/multithreading.ML;
wenzelm
parents:
diff
changeset
|
82 |
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62359 | 83 |
fun synchronized name lock e = |
62923 | 84 |
Exn.release (Thread_Attributes.uninterruptible (fn restore_attributes => fn () => |
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if ! trace > 0 then |
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let |
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val immediate = |
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if Mutex.trylock lock then true |
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else |
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let |
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val _ = tracing 5 (fn () => name ^ ": locking ..."); |
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val timer = Timer.startRealTimer (); |
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val _ = Mutex.lock lock; |
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val time = Timer.checkRealTimer timer; |
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val _ = tracing_time true time (fn () => name ^ ": locked after " ^ Time.toString time); |
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in false end; |
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val result = Exn.capture (restore_attributes e) (); |
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val _ = if immediate then () else tracing 5 (fn () => name ^ ": unlocking ..."); |
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val _ = Mutex.unlock lock; |
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in result end |
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else |
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let |
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val _ = Mutex.lock lock; |
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val result = Exn.capture (restore_attributes e) (); |
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val _ = Mutex.unlock lock; |
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in result end) ()); |
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59054
61b723761dff
load simple_thread.ML later, such that it benefits from redefined print_exception_trace;
wenzelm
parents:
54717
diff
changeset
|
107 |
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28123
53cd972d7db9
provide dummy thread structures, including proper Thread.getLocal/setLocal;
wenzelm
parents:
26082
diff
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108 |
end; |