source: libcfa/src/concurrency/thread.cfa @ aec68b6

arm-ehjacob/cs343-translationnew-ast-unique-expr
Last change on this file since aec68b6 was 254ad1b, checked in by Thierry Delisle <tdelisle@…>, 6 months ago

Separate schedule_thread from the scheduler lock

  • Property mode set to 100644
File size: 4.9 KB
Line 
1//
2// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
3//
4// The contents of this file are covered under the licence agreement in the
5// file "LICENCE" distributed with Cforall.
6//
7// thread.c --
8//
9// Author           : Thierry Delisle
10// Created On       : Tue Jan 17 12:27:26 2017
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Wed Dec  4 09:17:49 2019
13// Update Count     : 9
14//
15
16#define __cforall_thread__
17
18#include "thread.hfa"
19
20#include "kernel_private.hfa"
21#include "exception.hfa"
22
23#define __CFA_INVOKE_PRIVATE__
24#include "invoke.h"
25
26//-----------------------------------------------------------------------------
27// Thread ctors and dtors
28void ?{}($thread & this, const char * const name, cluster & cl, void * storage, size_t storageSize ) with( this ) {
29        context{ 0p, 0p };
30        self_cor{ name, storage, storageSize };
31        ticket = TICKET_RUNNING;
32        state = Start;
33        preempted = __NO_PREEMPTION;
34        curr_cor = &self_cor;
35        self_mon.owner = &this;
36        self_mon.recursion = 1;
37        self_mon_p = &self_mon;
38        curr_cluster = &cl;
39        link.next = 0p;
40        link.prev = 0p;
41        #if defined( __CFA_WITH_VERIFY__ )
42                canary = 0x0D15EA5E0D15EA5Ep;
43        #endif
44
45        seqable.next = 0p;
46        seqable.back = 0p;
47
48        node.next = 0p;
49        node.prev = 0p;
50        doregister(curr_cluster, this);
51
52        monitors{ &self_mon_p, 1, (fptr_t)0 };
53}
54
55void ^?{}($thread& this) with( this ) {
56        #if defined( __CFA_WITH_VERIFY__ )
57                canary = 0xDEADDEADDEADDEADp;
58        #endif
59        unregister(curr_cluster, this);
60        ^self_cor{};
61}
62
63forall(T &)
64void copy(ThreadCancelled(T) * dst, ThreadCancelled(T) * src) {
65        dst->virtual_table = src->virtual_table;
66        dst->the_thread = src->the_thread;
67        dst->the_exception = src->the_exception;
68}
69
70forall(T &)
71const char * msg(ThreadCancelled(T) *) {
72        return "ThreadCancelled(...)";
73}
74
75forall(T &)
76static void default_thread_cancel_handler(ThreadCancelled(T) & ) {
77        // Improve this error message, can I do formatting?
78        abort( "Unhandled thread cancellation.\n" );
79}
80
81forall(T & | is_thread(T) | IS_EXCEPTION(ThreadCancelled, (T))
82    | { _EHM_VTABLE_TYPE(ThreadCancelled)(T) & const _default_vtable; })
83void ?{}( thread_dtor_guard_t & this,
84                T & thrd, void(*cancelHandler)(ThreadCancelled(T) &)) {
85        $monitor * m = get_monitor(thrd);
86        $thread * desc = get_thread(thrd);
87
88        // Setup the monitor guard
89        void (*dtor)(T& mutex this) = ^?{};
90        bool join = cancelHandler != (void(*)(ThreadCancelled(T)&))0;
91        (this.mg){&m, (void(*)())dtor, join};
92
93
94        /* paranoid */ verifyf( Halted == desc->state || Cancelled == desc->state, "Expected thread to be Halted or Cancelled, was %d\n", (int)desc->state );
95
96        // After the guard set-up and any wait, check for cancellation.
97        struct _Unwind_Exception * cancellation = desc->self_cor.cancellation;
98        if ( likely( 0p == cancellation ) ) {
99                return;
100        } else if ( Cancelled == desc->state ) {
101                return;
102        }
103        desc->state = Cancelled;
104        void(*defaultResumptionHandler)(ThreadCancelled(T) &) =
105                join ? cancelHandler : default_thread_cancel_handler;
106
107        // TODO: Remove explitate vtable set once trac#186 is fixed.
108        ThreadCancelled(T) except;
109        except.virtual_table = &_default_vtable;
110        except.the_thread = &thrd;
111        except.the_exception = __cfaehm_cancellation_exception( cancellation );
112        // Why is this cast required?
113        throwResume (ThreadCancelled(T) &)except;
114
115        except.the_exception->virtual_table->free( except.the_exception );
116        free( cancellation );
117        desc->self_cor.cancellation = 0p;
118}
119
120void ^?{}( thread_dtor_guard_t & this ) {
121        ^(this.mg){};
122}
123
124//-----------------------------------------------------------------------------
125// Starting and stopping threads
126forall( T & | is_thread(T) )
127void __thrd_start( T & this, void (*main_p)(T &) ) {
128        $thread * this_thrd = get_thread(this);
129
130        disable_interrupts();
131        __cfactx_start(main_p, get_coroutine(this), this, __cfactx_invoke_thread);
132
133        this_thrd->context.[SP, FP] = this_thrd->self_cor.context.[SP, FP];
134        /* paranoid */ verify( this_thrd->context.SP );
135
136        schedule_thread$( this_thrd );
137        enable_interrupts();
138}
139
140//-----------------------------------------------------------------------------
141// Support for threads that don't ues the thread keyword
142forall( T & | sized(T) | is_thread(T) | { void ?{}(T&); } )
143void ?{}( scoped(T)& this ) with( this ) {
144        handle{};
145        __thrd_start(handle, main);
146}
147
148forall( T &, P... | sized(T) | is_thread(T) | { void ?{}(T&, P); } )
149void ?{}( scoped(T)& this, P params ) with( this ) {
150        handle{ params };
151        __thrd_start(handle, main);
152}
153
154forall( T & | sized(T) | is_thread(T) )
155void ^?{}( scoped(T)& this ) with( this ) {
156        ^handle{};
157}
158
159//-----------------------------------------------------------------------------
160forall(T & | is_thread(T) | IS_RESUMPTION_EXCEPTION(ThreadCancelled, (T))
161    | { _EHM_VTABLE_TYPE(ThreadCancelled)(T) & const _default_vtable; })
162T & join( T & this ) {
163        thread_dtor_guard_t guard = { this, defaultResumptionHandler };
164        return this;
165}
166
167uint64_t thread_rand() {
168        disable_interrupts();
169        uint64_t ret = __tls_rand();
170        enable_interrupts();
171        return ret;
172}
173
174// Local Variables: //
175// mode: c //
176// tab-width: 4 //
177// End: //
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