source: src/libcfa/concurrency/coroutines.c @ 6a3d2e7

aaron-thesisarm-ehcleanup-dtorsdeferred_resndemanglerenumforall-pointer-decayjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprnew-envno_listpersistent-indexerpthread-emulationqualifiedEnumresolv-newwith_gc
Last change on this file since 6a3d2e7 was 6a3d2e7, checked in by Thierry Delisle <tdelisle@…>, 6 years ago

Moved coroutines code in libcfa to coroutines header

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File size: 5.4 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// coroutines.c --
8//
9// Author           : Thierry Delisle
10// Created On       : Mon Nov 28 12:27:26 2016
11// Last Modified By : Thierry Delisle
12// Last Modified On : Mon Nov 28 12:27:26 2016
13// Update Count     : 0
14//
15
16extern "C" {
17#include <stddef.h>
18#include <malloc.h>
19#include <errno.h>
20#include <string.h>
21#include <unistd.h>
22#include <sys/mman.h>
23}
24
25#include "coroutines"
26#include "libhdr.h"
27
28#define __CFA_INVOKE_PRIVATE__
29#include "invoke.h"
30
31//-----------------------------------------------------------------------------
32// Global state variables
33
34// minimum feasible stack size in bytes
35#define MinStackSize 1000
36static size_t pageSize = 0;                             // architecture pagesize HACK, should go in proper runtime singleton
37
38//Extra private desctructor for the main
39//FIXME the main should not actually allocate a stack
40//Since the main is never resumed the extra stack does not cause
41//any problem but it is wasted memory
42void ?{}(coStack_t* this, size_t size);
43void ?{}(coroutine* this, size_t size);
44
45//Main coroutine
46//FIXME do not construct a stack for the main
47coroutine main_coroutine = { 1000 };
48
49//Current coroutine
50//Will need to be in TLS when multi-threading is added
51coroutine* current_coroutine = &main_coroutine;
52
53//-----------------------------------------------------------------------------
54// Coroutine ctors and dtors
55void ?{}(coStack_t* this) {
56        this->size              = 10240;        // size of stack
57        this->storage   = NULL; // pointer to stack
58        this->limit             = NULL; // stack grows towards stack limit
59        this->base              = NULL; // base of stack
60        this->context   = NULL; // address of cfa_context_t
61        this->top               = NULL; // address of top of storage
62        this->userStack = false;       
63}
64
65void ?{}(coStack_t* this, size_t size) {
66        this{};
67        this->size = size;
68
69        create_stack(this, this->size);
70}
71
72void ?{}(coroutine* this) {
73        this->name = "Anonymous Coroutine";
74        this->errno_ = 0;
75        this->state = Start;
76      this->notHalted = true;
77        this->starter = NULL;
78        this->last = NULL;
79}
80
81void ?{}(coroutine* this, size_t size) {
82        this{};
83        (&this->stack){size};
84}
85
86void ^?{}(coStack_t* this) {
87        if ( ! this->userStack ) {
88                LIB_DEBUG_DO(
89                        if ( mprotect( this->storage, pageSize, PROT_READ | PROT_WRITE ) == -1 ) {
90                                abortf( "(coStack_t *)%p.^?{}() : internal error, mprotect failure, error(%d) %s.", this, errno, strerror( errno ) );
91                        }
92                );
93                free( this->storage );
94        }
95}
96
97void ^?{}(coroutine* this) {}
98
99// Part of the Public API
100// Not inline since only ever called once per coroutine
101forall(dtype T | is_coroutine(T))
102void prime(T* cor) {
103        coroutine* this = get_coroutine(cor);
104        assert(this->state == Start);
105
106        this->state = Primed;
107        resume(cor);
108}
109
110// We need to call suspend from invoke.c, so we expose this wrapper that
111// is not inline (We can't inline Cforall in C)
112void suspend_no_inline(void) {
113        suspend();
114}
115
116void corCxtSw(coroutine* src, coroutine* dst) {
117        // THREAD_GETMEM( This )->disableInterrupts();
118
119        // set state of current coroutine to inactive
120        src->state = Inactive;
121
122        // set new coroutine that task is executing
123        current_coroutine = dst;                       
124
125        // context switch to specified coroutine
126        CtxSwitch( src->stack.context, dst->stack.context );
127        // when CtxSwitch returns we are back in the src coroutine             
128
129        // set state of new coroutine to active
130        src->state = Active;
131
132        // THREAD_GETMEM( This )->enableInterrupts();
133} //ctxSwitchDirect
134
135void create_stack( coStack_t* this, unsigned int storageSize ) {
136        //TEMP HACK do this on proper kernel startup
137        if(pageSize == 0ul) pageSize = sysconf( _SC_PAGESIZE );
138
139        size_t cxtSize = libCeiling( sizeof(machine_context_t), 8 ); // minimum alignment
140
141        if ( (intptr_t)this->storage == 0 ) {
142                this->userStack = false;
143                this->size = libCeiling( storageSize, 16 );
144                // use malloc/memalign because "new" raises an exception for out-of-memory
145               
146                // assume malloc has 8 byte alignment so add 8 to allow rounding up to 16 byte alignment
147                LIB_DEBUG_DO( this->storage = memalign( pageSize, cxtSize + this->size + pageSize ) );
148                LIB_NO_DEBUG_DO( this->storage = malloc( cxtSize + this->size + 8 ) );
149
150                LIB_DEBUG_DO(
151                        if ( mprotect( this->storage, pageSize, PROT_NONE ) == -1 ) {
152                                abortf( "(uMachContext &)%p.createContext() : internal error, mprotect failure, error(%d) %s.", this, (int)errno, strerror( (int)errno ) );
153                        } // if
154                );
155
156                if ( (intptr_t)this->storage == 0 ) {
157                        abortf( "Attempt to allocate %d bytes of storage for coroutine or task execution-state but insufficient memory available.", this->size );
158                } // if
159
160                LIB_DEBUG_DO( this->limit = (char *)this->storage + pageSize );
161                LIB_NO_DEBUG_DO( this->limit = (char *)libCeiling( (unsigned long)this->storage, 16 ) ); // minimum alignment
162
163        } else {
164                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() );
165                this->userStack = true;
166                this->size = storageSize - cxtSize;
167
168                if ( this->size % 16 != 0u ) this->size -= 8;
169
170                this->limit = (char *)libCeiling( (unsigned long)this->storage, 16 ); // minimum alignment
171        } // if
172        assertf( this->size >= MinStackSize, "Stack size %d provides less than minimum of %d bytes for a stack.", this->size, MinStackSize );
173
174        this->base = (char *)this->limit + this->size;
175        this->context = this->base;
176        this->top = (char *)this->context + cxtSize;
177}
178
179// Local Variables: //
180// mode: c //
181// tab-width: 4 //
182// End: //
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