author | wenzelm |
Sat, 25 Jul 2009 00:53:47 +0200 | |
changeset 32186 | 8026b73cd357 |
parent 32185 | 57ecfab3bcfe |
child 32298 | 400cc493d466 |
permissions | -rw-r--r-- |
wenzelm@28241 | 1 |
(* Title: Pure/Concurrent/simple_thread.ML |
wenzelm@28241 | 2 |
Author: Makarius |
wenzelm@28241 | 3 |
|
wenzelm@28577 | 4 |
Simplified thread operations. |
wenzelm@28241 | 5 |
*) |
wenzelm@28241 | 6 |
|
wenzelm@28241 | 7 |
signature SIMPLE_THREAD = |
wenzelm@28241 | 8 |
sig |
wenzelm@28241 | 9 |
val fork: bool -> (unit -> unit) -> Thread.thread |
wenzelm@28550 | 10 |
val interrupt: Thread.thread -> unit |
wenzelm@28577 | 11 |
val synchronized: string -> Mutex.mutex -> (unit -> 'a) -> 'a |
wenzelm@28241 | 12 |
end; |
wenzelm@28241 | 13 |
|
wenzelm@28241 | 14 |
structure SimpleThread: SIMPLE_THREAD = |
wenzelm@28241 | 15 |
struct |
wenzelm@28241 | 16 |
|
wenzelm@28241 | 17 |
fun fork interrupts body = |
wenzelm@28241 | 18 |
Thread.fork (fn () => exception_trace (fn () => body ()), |
wenzelm@28241 | 19 |
if interrupts then Multithreading.regular_interrupts else Multithreading.no_interrupts); |
wenzelm@28241 | 20 |
|
wenzelm@28550 | 21 |
fun interrupt thread = Thread.interrupt thread handle Thread _ => (); |
wenzelm@28550 | 22 |
|
wenzelm@28577 | 23 |
|
wenzelm@28577 | 24 |
(* basic synchronization *) |
wenzelm@28577 | 25 |
|
wenzelm@28577 | 26 |
fun synchronized name lock e = Exn.release (uninterruptible (fn restore_attributes => fn () => |
wenzelm@28577 | 27 |
let |
wenzelm@32051 | 28 |
val immediate = |
wenzelm@32051 | 29 |
if Mutex.trylock lock then true |
wenzelm@28577 | 30 |
else |
wenzelm@32184 | 31 |
let |
wenzelm@32184 | 32 |
val _ = Multithreading.tracing 5 (fn () => name ^ ": locking ..."); |
wenzelm@32185 | 33 |
val time = Multithreading.real_time Mutex.lock lock; |
wenzelm@32186 | 34 |
val _ = Multithreading.tracing_time true time |
wenzelm@32185 | 35 |
(fn () => name ^ ": locked after " ^ Time.toString time); |
wenzelm@32184 | 36 |
in false end; |
wenzelm@28577 | 37 |
val result = Exn.capture (restore_attributes e) (); |
wenzelm@32051 | 38 |
val _ = |
wenzelm@32184 | 39 |
if immediate then () else Multithreading.tracing 5 (fn () => name ^ ": unlocking ..."); |
wenzelm@28577 | 40 |
val _ = Mutex.unlock lock; |
wenzelm@28577 | 41 |
in result end) ()); |
wenzelm@28577 | 42 |
|
wenzelm@28241 | 43 |
end; |