| 1 | //
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
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| 3 | //
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| 4 | // The contents of this file are covered under the licence agreement in the
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| 5 | // file "LICENCE" distributed with Cforall.
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| 6 | //
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| 7 | // thread.c --
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| 8 | //
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| 9 | // Author : Thierry Delisle
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| 10 | // Created On : Tue Jan 17 12:27:26 2017
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| 11 | // Last Modified By : Peter A. Buhr
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| 12 | // Last Modified On : Sun Sep 3 08:25:21 2023
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| 13 | // Update Count : 105
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| 14 | //
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| 15 |
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| 16 | #define __cforall_thread__
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| 17 |
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| 18 | #include "thread.hfa"
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| 19 |
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| 20 | #include "exception.hfa"
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| 21 | #include "kernel/private.hfa"
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| 22 | #include "limits.hfa"
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| 23 |
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| 24 | #define __CFA_INVOKE_PRIVATE__
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| 25 | #include "invoke.h"
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| 26 |
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| 27 | extern size_t __global_random_seed;
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| 28 | extern size_t __global_random_prime;
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| 29 | extern bool __global_random_mask;
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| 30 |
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| 31 | #pragma GCC visibility push(default)
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| 32 |
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| 33 | //-----------------------------------------------------------------------------
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| 34 | // Thread ctors and dtors
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| 35 | void ?{}( thread$ & this, const char * const name, cluster & cl, void * storage, size_t storageSize ) with( this ) {
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| 36 | context{ 0p, 0p };
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| 37 | self_cor{ name, storage, storageSize };
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| 38 | ticket = TICKET_RUNNING;
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| 39 | state = Start;
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| 40 | preempted = __NO_PREEMPTION;
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| 41 | corctx_flag = false;
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| 42 | curr_cor = &self_cor;
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| 43 | self_mon.owner = &this;
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| 44 | self_mon.recursion = 1;
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| 45 | self_mon_p = &self_mon;
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| 46 | curr_cluster = &cl;
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| 47 | rdy_link.next = 0p;
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| 48 | rdy_link.ts = MAX;
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| 49 | user_link.next = 0p;
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| 50 | user_link.prev = 0p;
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| 51 | cltr_link.next = 0p;
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| 52 | cltr_link.prev = 0p;
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| 53 | preferred = ready_queue_new_preferred();
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| 54 | last_proc = 0p;
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| 55 | link_node = 0p;
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| 56 | PRNG_SET_SEED( random_state, __global_random_mask ? __global_random_prime : __global_random_prime ^ rdtscl() );
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| 57 | #if defined( __CFA_WITH_VERIFY__ )
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| 58 | executing = 0p;
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| 59 | canary = 0x0D15EA5E0D15EA5Ep;
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| 60 | #endif
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| 61 |
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| 62 | doregister(curr_cluster, this);
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| 63 | monitors{ &self_mon_p, 1, (fptr_t)0, (func_id_t)0 };
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| 64 | }
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| 65 |
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| 66 | void ^?{}(thread$& this) with( this ) {
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| 67 | #if defined( __CFA_WITH_VERIFY__ )
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| 68 | canary = 0xDEADDEADDEADDEADp;
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| 69 | #endif
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| 70 | unregister(curr_cluster, this);
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| 71 | ^self_cor{};
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| 72 | }
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| 73 |
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| 74 | forall(T &)
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| 75 | void copy(ThreadCancelled(T) * dst, ThreadCancelled(T) * src) {
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| 76 | dst->virtual_table = src->virtual_table;
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| 77 | dst->the_thread = src->the_thread;
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| 78 | dst->the_exception = src->the_exception;
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| 79 | }
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| 80 |
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| 81 | forall(T &)
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| 82 | const char * msg(ThreadCancelled(T) *) {
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| 83 | return "ThreadCancelled(...)";
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| 84 | }
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| 85 |
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| 86 | forall(T &)
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| 87 | static void default_thread_cancel_handler(ThreadCancelled(T) & ) {
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| 88 | // Improve this error message, can I do formatting?
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| 89 | abort( "Unhandled thread cancellation.\n" );
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| 90 | }
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| 91 |
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| 92 | forall(T & | is_thread(T) | IS_EXCEPTION(ThreadCancelled(T))
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| 93 | | { EHM_DEFAULT_VTABLE(ThreadCancelled(T)); })
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| 94 | void ?{}( thread_dtor_guard_t & this,
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| 95 | T & thrd, func_id_t func_id, void(*cancelHandler)(ThreadCancelled(T) &)) {
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| 96 | monitor$ * m = get_monitor(thrd);
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| 97 | thread$ * desc = get_thread(thrd);
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| 98 |
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| 99 | // Setup the monitor guard
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| 100 | void (*dtor)(T& mutex this) = ^?{};
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| 101 | bool join = cancelHandler != (void(*)(ThreadCancelled(T)&))0;
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| 102 | this.func_id = func_id;
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| 103 | (this.mg){&m, (void(*)())dtor, func_id, join};
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| 104 |
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| 105 |
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| 106 | /* paranoid */ verifyf( Halted == desc->state || Cancelled == desc->state, "Expected thread to be Halted or Cancelled, was %d\n", (int)desc->state );
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| 107 |
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| 108 | // After the guard set-up and any wait, check for cancellation.
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| 109 | struct _Unwind_Exception * cancellation = desc->self_cor.cancellation;
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| 110 | if ( likely( 0p == cancellation ) ) {
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| 111 | return;
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| 112 | } else if ( Cancelled == desc->state ) {
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| 113 | return;
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| 114 | }
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| 115 | desc->state = Cancelled;
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| 116 | void(*defaultResumptionHandler)(ThreadCancelled(T) &) =
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| 117 | join ? cancelHandler : default_thread_cancel_handler;
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| 118 |
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| 119 | // TODO: Remove explitate vtable set once trac#186 is fixed.
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| 120 | ThreadCancelled(T) except;
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| 121 | except.virtual_table = &_default_vtable;
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| 122 | except.the_thread = &thrd;
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| 123 | except.the_exception = __cfaehm_cancellation_exception( cancellation );
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| 124 | // Why is this cast required?
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| 125 | throwResume (ThreadCancelled(T) &)except;
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| 126 |
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| 127 | except.the_exception->virtual_table->free( except.the_exception );
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| 128 | free( cancellation );
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| 129 | desc->self_cor.cancellation = 0p;
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| 130 | }
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| 131 |
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| 132 | void ^?{}( thread_dtor_guard_t & this ) {
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| 133 | ^(this.mg){};
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| 134 | }
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| 135 |
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| 136 | //-----------------------------------------------------------------------------
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| 137 | // Starting and stopping threads
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| 138 | forall( T & | is_basic_thread(T) )
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| 139 | void __thrd_start( T & this, void (*main_p)(T &) ) {
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| 140 | thread$ * this_thrd = get_thread(this);
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| 141 |
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| 142 | disable_interrupts();
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| 143 | __cfactx_start(main_p, get_coroutine(this), this, __cfactx_invoke_thread);
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| 144 |
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| 145 | this_thrd->context.[SP, FP] = this_thrd->self_cor.context.[SP, FP];
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| 146 | /* paranoid */ verify( this_thrd->context.SP );
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| 147 |
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| 148 | schedule_thread$( this_thrd, UNPARK_LOCAL );
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| 149 | enable_interrupts();
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| 150 | }
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| 151 |
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| 152 | //-----------------------------------------------------------------------------
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| 153 | // Support for threads that don't ues the thread keyword
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| 154 | forall( T & | sized(T) | is_thread(T) | { void ?{}(T&); } )
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| 155 | void ?{}( scoped(T)& this ) with( this ) {
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| 156 | handle{};
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| 157 | __thrd_start(handle, main);
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| 158 | }
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| 159 |
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| 160 | forall( T &, P... | sized(T) | is_thread(T) | { void ?{}(T&, P); } )
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| 161 | void ?{}( scoped(T)& this, P params ) with( this ) {
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| 162 | handle{ params };
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| 163 | __thrd_start(handle, main);
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| 164 | }
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| 165 |
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| 166 | forall( T & | sized(T) | is_thread(T) )
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| 167 | void ^?{}( scoped(T)& this ) with( this ) {
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| 168 | ^handle{};
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| 169 | }
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| 170 |
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| 171 | //-----------------------------------------------------------------------------
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| 172 | forall(T & | is_thread(T) | IS_RESUMPTION_EXCEPTION(ThreadCancelled(T))
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| 173 | | { EHM_DEFAULT_VTABLE(ThreadCancelled(T)); })
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| 174 | T & join( T & this ) {
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| 175 | thread_dtor_guard_t guard = { this, (func_id_t)0, defaultResumptionHandler };
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| 176 | return this;
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| 177 | }
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| 178 |
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| 179 | //-----------------------------------------------------------------------------
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| 180 | bool migrate( thread$ * thrd, struct cluster & cl ) {
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| 181 | monitor$ * tmon = get_monitor(thrd);
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| 182 | monitor$ * __monitors[] = { tmon };
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| 183 | monitor_guard_t __guard = { __monitors, 1 };
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| 184 | {
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| 185 | // if nothing needs to be done, return false
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| 186 | if( thrd->curr_cluster == &cl ) return false;
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| 187 |
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| 188 | // are we migrating ourself?
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| 189 | const bool local = thrd == active_thread();
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| 190 |
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| 191 | /* paranoid */ verify( !local || &cl != active_cluster() );
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| 192 | /* paranoid */ verify( !local || thrd->curr_cluster == active_cluster() );
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| 193 | /* paranoid */ verify( !local || thrd->curr_cluster == active_processor()->cltr );
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| 194 | /* paranoid */ verify( local || tmon->signal_stack.top->owner->waiting_thread == thrd );
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| 195 | /* paranoid */ verify( local || tmon->signal_stack.top );
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| 196 |
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| 197 | // make sure we aren't interrupted while doing this
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| 198 | // not as important if we aren't local
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| 199 | disable_interrupts();
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| 200 |
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| 201 | // actually move the thread
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| 202 | unregister( thrd->curr_cluster, *thrd );
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| 203 | thrd->curr_cluster = &cl;
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| 204 | doregister( thrd->curr_cluster, *thrd );
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| 205 |
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| 206 | // restore interrupts
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| 207 | enable_interrupts();
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| 208 |
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| 209 | // if this is the local thread, we are still running on the old cluster
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| 210 | if(local) yield();
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| 211 |
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| 212 | /* paranoid */ verify( !local || &cl == active_cluster() );
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| 213 | /* paranoid */ verify( !local || thrd->curr_cluster == active_cluster() );
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| 214 | /* paranoid */ verify( !local || thrd->curr_cluster == active_processor()->cltr );
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| 215 | /* paranoid */ verify( local || tmon->signal_stack.top );
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| 216 | /* paranoid */ verify( local || tmon->signal_stack.top->owner->waiting_thread == thrd );
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| 217 |
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| 218 | return true;
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| 219 | }
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| 220 | }
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| 221 |
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| 222 | //-----------------------------------------------------------------------------
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| 223 |
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| 224 | void set_seed( size_t seed ) {
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| 225 | PRNG_STATE_T & state = active_thread()->random_state;
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| 226 | PRNG_SET_SEED( state, seed );
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| 227 | __global_random_seed = seed;
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| 228 | __global_random_prime = seed;
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| 229 | __global_random_mask = true;
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| 230 | } // set_seed
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| 231 |
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| 232 | size_t get_seed( void ) { return __global_random_seed; }
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| 233 |
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| 234 | size_t prng( void ) { // [0,UINT_MAX]
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| 235 | return PRNG_NAME( active_thread()->random_state );
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| 236 | } // prng
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| 237 |
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| 238 | // Local Variables: //
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| 239 | // mode: c //
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| 240 | // tab-width: 4 //
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| 241 | // End: //
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