source: libcfa/src/concurrency/thread.cfa @ cfff639

arm-ehjacob/cs343-translationnew-ast-unique-expr
Last change on this file since cfff639 was cfff639, checked in by Thierry Delisle <tdelisle@…>, 7 months ago

Merge branch 'master' of plg.uwaterloo.ca:software/cfa/cfa-cc

  • 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 ?{}($thread & this, const char * const name, cluster & cl, void * storage, size_t storageSize ) with( this ) {
29        context{ 0p, 0p };
30        self_cor{ name, storage, storageSize };
31        ticket = TICKET_RUNNING;
32        state = Start;
33        preempted = __NO_PREEMPTION;
34        curr_cor = &self_cor;
35        self_mon.owner = &this;
36        self_mon.recursion = 1;
37        self_mon_p = &self_mon;
38        curr_cluster = &cl;
39        link.next = 0p;
40        link.prev = 0p;
41        link.preferred = -1u;
42        last_proc = 0p;
43        #if defined( __CFA_WITH_VERIFY__ )
44                canary = 0x0D15EA5E0D15EA5Ep;
45        #endif
46
47        seqable.next = 0p;
48        seqable.back = 0p;
49
50        node.next = 0p;
51        node.prev = 0p;
52        doregister(curr_cluster, this);
53
54        monitors{ &self_mon_p, 1, (fptr_t)0 };
55}
56
57void ^?{}($thread& this) with( this ) {
58        #if defined( __CFA_WITH_VERIFY__ )
59                canary = 0xDEADDEADDEADDEADp;
60        #endif
61        unregister(curr_cluster, this);
62        ^self_cor{};
63}
64
65forall(T &)
66void copy(ThreadCancelled(T) * dst, ThreadCancelled(T) * src) {
67        dst->virtual_table = src->virtual_table;
68        dst->the_thread = src->the_thread;
69        dst->the_exception = src->the_exception;
70}
71
72forall(T &)
73const char * msg(ThreadCancelled(T) *) {
74        return "ThreadCancelled(...)";
75}
76
77forall(T &)
78static void default_thread_cancel_handler(ThreadCancelled(T) & ) {
79        // Improve this error message, can I do formatting?
80        abort( "Unhandled thread cancellation.\n" );
81}
82
83forall(T & | is_thread(T) | IS_EXCEPTION(ThreadCancelled, (T))
84    | { _EHM_VTABLE_TYPE(ThreadCancelled)(T) & const _default_vtable; })
85void ?{}( thread_dtor_guard_t & this,
86                T & thrd, void(*cancelHandler)(ThreadCancelled(T) &)) {
87        $monitor * m = get_monitor(thrd);
88        $thread * desc = get_thread(thrd);
89
90        // Setup the monitor guard
91        void (*dtor)(T& mutex this) = ^?{};
92        bool join = cancelHandler != (void(*)(ThreadCancelled(T)&))0;
93        (this.mg){&m, (void(*)())dtor, join};
94
95
96        /* paranoid */ verifyf( Halted == desc->state || Cancelled == desc->state, "Expected thread to be Halted or Cancelled, was %d\n", (int)desc->state );
97
98        // After the guard set-up and any wait, check for cancellation.
99        struct _Unwind_Exception * cancellation = desc->self_cor.cancellation;
100        if ( likely( 0p == cancellation ) ) {
101                return;
102        } else if ( Cancelled == desc->state ) {
103                return;
104        }
105        desc->state = Cancelled;
106        void(*defaultResumptionHandler)(ThreadCancelled(T) &) =
107                join ? cancelHandler : default_thread_cancel_handler;
108
109        // TODO: Remove explitate vtable set once trac#186 is fixed.
110        ThreadCancelled(T) except;
111        except.virtual_table = &_default_vtable;
112        except.the_thread = &thrd;
113        except.the_exception = __cfaehm_cancellation_exception( cancellation );
114        // Why is this cast required?
115        throwResume (ThreadCancelled(T) &)except;
116
117        except.the_exception->virtual_table->free( except.the_exception );
118        free( cancellation );
119        desc->self_cor.cancellation = 0p;
120}
121
122void ^?{}( thread_dtor_guard_t & this ) {
123        ^(this.mg){};
124}
125
126//-----------------------------------------------------------------------------
127// Starting and stopping threads
128forall( T & | is_thread(T) )
129void __thrd_start( T & this, void (*main_p)(T &) ) {
130        $thread * this_thrd = get_thread(this);
131
132        disable_interrupts();
133        __cfactx_start(main_p, get_coroutine(this), this, __cfactx_invoke_thread);
134
135        this_thrd->context.[SP, FP] = this_thrd->self_cor.context.[SP, FP];
136        /* paranoid */ verify( this_thrd->context.SP );
137
138        schedule_thread$( this_thrd );
139        enable_interrupts();
140}
141
142//-----------------------------------------------------------------------------
143// Support for threads that don't ues the thread keyword
144forall( T & | sized(T) | is_thread(T) | { void ?{}(T&); } )
145void ?{}( scoped(T)& this ) with( this ) {
146        handle{};
147        __thrd_start(handle, main);
148}
149
150forall( T &, P... | sized(T) | is_thread(T) | { void ?{}(T&, P); } )
151void ?{}( scoped(T)& this, P params ) with( this ) {
152        handle{ params };
153        __thrd_start(handle, main);
154}
155
156forall( T & | sized(T) | is_thread(T) )
157void ^?{}( scoped(T)& this ) with( this ) {
158        ^handle{};
159}
160
161//-----------------------------------------------------------------------------
162forall(T & | is_thread(T) | IS_RESUMPTION_EXCEPTION(ThreadCancelled, (T))
163    | { _EHM_VTABLE_TYPE(ThreadCancelled)(T) & const _default_vtable; })
164T & join( T & this ) {
165        thread_dtor_guard_t guard = { this, defaultResumptionHandler };
166        return this;
167}
168
169uint64_t thread_rand() {
170        disable_interrupts();
171        uint64_t ret = __tls_rand();
172        enable_interrupts();
173        return ret;
174}
175
176// Local Variables: //
177// mode: c //
178// tab-width: 4 //
179// End: //
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