source: src/libcfa/concurrency/coroutine.c @ c2b9f21

aaron-thesisarm-ehcleanup-dtorsdeferred_resndemanglerjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprnew-envno_listpersistent-indexerresolv-newwith_gc
Last change on this file since c2b9f21 was c2b9f21, checked in by Thierry Delisle <tdelisle@…>, 4 years ago

Removed libhdr, moved its content to bits

  • Property mode set to 100644
File size: 5.8 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// coroutine.c --
8//
9// Author           : Thierry Delisle
10// Created On       : Mon Nov 28 12:27:26 2016
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Fri Jul 21 22:34:57 2017
13// Update Count     : 1
14//
15
16#include "coroutine"
17
18extern "C" {
19#include <stddef.h>
20#include <malloc.h>
21#include <errno.h>
22#include <string.h>
23#include <unistd.h>
24#include <sys/mman.h>
25}
26
27#include "kernel_private.h"
28
29#define __CFA_INVOKE_PRIVATE__
30#include "invoke.h"
31
32//-----------------------------------------------------------------------------
33// Global state variables
34
35// minimum feasible stack size in bytes
36#define MinStackSize 1000
37static size_t pageSize = 0;                             // architecture pagesize HACK, should go in proper runtime singleton
38
39//-----------------------------------------------------------------------------
40// Coroutine ctors and dtors
41void ?{}(coStack_t& this) {
42        this.size               = 65000;        // size of stack
43        this.storage    = NULL; // pointer to stack
44        this.limit              = NULL; // stack grows towards stack limit
45        this.base               = NULL; // base of stack
46        this.context    = NULL; // address of cfa_context_t
47        this.top                = NULL; // address of top of storage
48        this.userStack  = false;
49}
50
51void ?{}(coStack_t& this, size_t size) {
52        this{};
53        this.size = size;
54
55        create_stack(&this, this.size);
56}
57
58void ?{}(coroutine_desc& this) {
59        this{ "Anonymous Coroutine" };
60}
61
62void ?{}(coroutine_desc& this, const char * name) {
63        this.name = name;
64        this.errno_ = 0;
65        this.state = Start;
66        this.starter = NULL;
67        this.last = NULL;
68}
69
70void ?{}(coroutine_desc& this, size_t size) {
71        this{};
72        (this.stack){size};
73}
74
75void ^?{}(coStack_t & this) {
76        if ( ! this.userStack && this.storage ) {
77                __cfaabi_dbg_debug_do(
78                        if ( mprotect( this.storage, pageSize, PROT_READ | PROT_WRITE ) == -1 ) {
79                                abortf( "(coStack_t *)%p.^?{}() : internal error, mprotect failure, error(%d) %s.", &this, errno, strerror( errno ) );
80                        }
81                );
82                free( this.storage );
83        }
84}
85
86void ^?{}(coroutine_desc& this) {}
87
88// Part of the Public API
89// Not inline since only ever called once per coroutine
90forall(dtype T | is_coroutine(T))
91void prime(T& cor) {
92        coroutine_desc* this = get_coroutine(cor);
93        assert(this->state == Start);
94
95        this->state = Primed;
96        resume(cor);
97}
98
99// Wrapper for co
100void CoroutineCtxSwitch(coroutine_desc* src, coroutine_desc* dst) {
101        // THREAD_GETMEM( This )->disableInterrupts();
102
103        // set state of current coroutine to inactive
104        src->state = src->state == Halted ? Halted : Inactive;
105
106        // set new coroutine that task is executing
107        this_coroutine = dst;
108
109        // context switch to specified coroutine
110        assert( src->stack.context );
111        CtxSwitch( src->stack.context, dst->stack.context );
112        // when CtxSwitch returns we are back in the src coroutine
113
114        // set state of new coroutine to active
115        src->state = Active;
116
117        // THREAD_GETMEM( This )->enableInterrupts();
118} //ctxSwitchDirect
119
120void create_stack( coStack_t* this, unsigned int storageSize ) {
121        //TEMP HACK do this on proper kernel startup
122        if(pageSize == 0ul) pageSize = sysconf( _SC_PAGESIZE );
123
124        size_t cxtSize = libCeiling( sizeof(machine_context_t), 8 ); // minimum alignment
125
126        if ( (intptr_t)this->storage == 0 ) {
127                this->userStack = false;
128                this->size = libCeiling( storageSize, 16 );
129                // use malloc/memalign because "new" raises an exception for out-of-memory
130
131                // assume malloc has 8 byte alignment so add 8 to allow rounding up to 16 byte alignment
132                __cfaabi_dbg_debug_do( this->storage = memalign( pageSize, cxtSize + this->size + pageSize ) );
133                __cfaabi_dbg_no_debug_do( this->storage = malloc( cxtSize + this->size + 8 ) );
134
135                __cfaabi_dbg_debug_do(
136                        if ( mprotect( this->storage, pageSize, PROT_NONE ) == -1 ) {
137                                abortf( "(uMachContext &)%p.createContext() : internal error, mprotect failure, error(%d) %s.", this, (int)errno, strerror( (int)errno ) );
138                        } // if
139                );
140
141                if ( (intptr_t)this->storage == 0 ) {
142                        abortf( "Attempt to allocate %d bytes of storage for coroutine or task execution-state but insufficient memory available.", this->size );
143                } // if
144
145                __cfaabi_dbg_debug_do( this->limit = (char *)this->storage + pageSize );
146                __cfaabi_dbg_no_debug_do( this->limit = (char *)libCeiling( (unsigned long)this->storage, 16 ) ); // minimum alignment
147
148        } else {
149                assertf( ((size_t)this->storage & (libAlign() - 1)) != 0ul, "Stack storage %p for task/coroutine must be aligned on %d byte boundary.", this->storage, (int)libAlign() );
150                this->userStack = true;
151                this->size = storageSize - cxtSize;
152
153                if ( this->size % 16 != 0u ) this->size -= 8;
154
155                this->limit = (char *)libCeiling( (unsigned long)this->storage, 16 ); // minimum alignment
156        } // if
157        assertf( this->size >= MinStackSize, "Stack size %zd provides less than minimum of %d bytes for a stack.", this->size, MinStackSize );
158
159        this->base = (char *)this->limit + this->size;
160        this->context = this->base;
161        this->top = (char *)this->context + cxtSize;
162}
163
164// We need to call suspend from invoke.c, so we expose this wrapper that
165// is not inline (We can't inline Cforall in C)
166extern "C" {
167        void __suspend_internal(void) {
168                suspend();
169        }
170
171        void __leave_coroutine(void) {
172                coroutine_desc * src = this_coroutine;          // optimization
173
174                assertf( src->starter != 0,
175                        "Attempt to suspend/leave coroutine \"%.256s\" (%p) that has never been resumed.\n"
176                        "Possible cause is a suspend executed in a member called by a coroutine user rather than by the coroutine main.",
177                        src->name, src );
178                assertf( src->starter->state != Halted,
179                        "Attempt by coroutine \"%.256s\" (%p) to suspend/leave back to terminated coroutine \"%.256s\" (%p).\n"
180                        "Possible cause is terminated coroutine's main routine has already returned.",
181                        src->name, src, src->starter->name, src->starter );
182
183                CoroutineCtxSwitch( src, src->starter );
184        }
185}
186
187// Local Variables: //
188// mode: c //
189// tab-width: 4 //
190// End: //
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