source: libcfa/src/concurrency/thread.cfa @ fe9468e2

arm-ehjacob/cs343-translationnew-ast-unique-expr
Last change on this file since fe9468e2 was fe9468e2, checked in by Thierry Delisle <tdelisle@…>, 11 months ago

Added function thread_rand as a tls-safe version of tls_rand()

  • Property mode set to 100644
File size: 4.8 KB
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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 ?{}($thread & this, const char * const name, cluster & cl, void * storage, size_t storageSize ) with( this ) {
29        context{ 0p, 0p };
30        self_cor{ name, storage, storageSize };
31        ticket = TICKET_RUNNING;
32        state = Start;
33        preempted = __NO_PREEMPTION;
34        curr_cor = &self_cor;
35        self_mon.owner = &this;
36        self_mon.recursion = 1;
37        self_mon_p = &self_mon;
38        curr_cluster = &cl;
39        link.next = 0p;
40        link.prev = 0p;
41        link.preferred = -1;
42        #if defined( __CFA_WITH_VERIFY__ )
43                canary = 0x0D15EA5E0D15EA5Ep;
44        #endif
45
46        node.next = 0p;
47        node.prev = 0p;
48        doregister(curr_cluster, this);
49
50        monitors{ &self_mon_p, 1, (fptr_t)0 };
51}
52
53void ^?{}($thread& this) with( this ) {
54        #if defined( __CFA_WITH_VERIFY__ )
55                canary = 0xDEADDEADDEADDEADp;
56        #endif
57        unregister(curr_cluster, this);
58        ^self_cor{};
59}
60
61FORALL_DATA_INSTANCE(ThreadCancelled, (dtype thread_t), (thread_t))
62
63forall(dtype 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(dtype T)
71const char * msg(ThreadCancelled(T) *) {
72        return "ThreadCancelled";
73}
74
75forall(dtype T)
76static void default_thread_cancel_handler(ThreadCancelled(T) & ) {
77        abort( "Unhandled thread cancellation.\n" );
78}
79
80forall(dtype T | is_thread(T) | IS_EXCEPTION(ThreadCancelled, (T)))
81void ?{}( thread_dtor_guard_t & this,
82                T & thrd, void(*defaultResumptionHandler)(ThreadCancelled(T) &)) {
83        $monitor * m = get_monitor(thrd);
84        $thread * desc = get_thread(thrd);
85
86        // Setup the monitor guard
87        void (*dtor)(T& mutex this) = ^?{};
88        bool join = defaultResumptionHandler != (void(*)(ThreadCancelled(T)&))0;
89        (this.mg){&m, (void(*)())dtor, join};
90
91
92        /* paranoid */ verifyf( Halted == desc->state || Cancelled == desc->state, "Expected thread to be Halted or Cancelled, was %d\n", (int)desc->state );
93
94        // After the guard set-up and any wait, check for cancellation.
95        struct _Unwind_Exception * cancellation = desc->self_cor.cancellation;
96        if ( likely( 0p == cancellation ) ) {
97                return;
98        } else if ( Cancelled == desc->state ) {
99                return;
100        }
101        desc->state = Cancelled;
102        if (!join) {
103                defaultResumptionHandler = default_thread_cancel_handler;
104        }
105
106        ThreadCancelled(T) except;
107        // TODO: Remove explitate vtable set once trac#186 is fixed.
108        except.virtual_table = &get_exception_vtable(&except);
109        except.the_thread = &thrd;
110        except.the_exception = __cfaehm_cancellation_exception( cancellation );
111        throwResume except;
112
113        except.the_exception->virtual_table->free( except.the_exception );
114        free( cancellation );
115        desc->self_cor.cancellation = 0p;
116}
117
118void ^?{}( thread_dtor_guard_t & this ) {
119        ^(this.mg){};
120}
121
122//-----------------------------------------------------------------------------
123// Starting and stopping threads
124forall( dtype T | is_thread(T) )
125void __thrd_start( T & this, void (*main_p)(T &) ) {
126        $thread * this_thrd = get_thread(this);
127
128        disable_interrupts();
129        __cfactx_start(main_p, get_coroutine(this), this, __cfactx_invoke_thread);
130
131        this_thrd->context.[SP, FP] = this_thrd->self_cor.context.[SP, FP];
132        verify( this_thrd->context.SP );
133
134        __schedule_thread( this_thrd );
135        enable_interrupts( __cfaabi_dbg_ctx );
136}
137
138//-----------------------------------------------------------------------------
139// Support for threads that don't ues the thread keyword
140forall( dtype T | sized(T) | is_thread(T) | { void ?{}(T&); } )
141void ?{}( scoped(T)& this ) with( this ) {
142        handle{};
143        __thrd_start(handle, main);
144}
145
146forall( dtype T, ttype P | sized(T) | is_thread(T) | { void ?{}(T&, P); } )
147void ?{}( scoped(T)& this, P params ) with( this ) {
148        handle{ params };
149        __thrd_start(handle, main);
150}
151
152forall( dtype T | sized(T) | is_thread(T) )
153void ^?{}( scoped(T)& this ) with( this ) {
154        ^handle{};
155}
156
157//-----------------------------------------------------------------------------
158forall(dtype T | is_thread(T) | IS_RESUMPTION_EXCEPTION(ThreadCancelled, (T)))
159T & join( T & this ) {
160        thread_dtor_guard_t guard = { this, defaultResumptionHandler };
161        return this;
162}
163
164uint64_t thread_rand() {
165        disable_interrupts();
166        uint64_t ret = __tls_rand();
167        enable_interrupts( __cfaabi_dbg_ctx );
168        return ret;
169}
170
171// Local Variables: //
172// mode: c //
173// tab-width: 4 //
174// End: //
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