source: src/libcfa/concurrency/coroutine.c @ 47ecf2b

aaron-thesisarm-ehcleanup-dtorsdeferred_resndemanglerjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprnew-envno_listpersistent-indexerresolv-newwith_gc
Last change on this file since 47ecf2b was 47ecf2b, checked in by Thierry Delisle <tdelisle@…>, 4 years ago

Some cleanup before refactoring alarms

  • Property mode set to 100644
File size: 5.2 KB
Line 
1//                              -*- Mode: CFA -*-
2//
3// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
4//
5// The contents of this file are covered under the licence agreement in the
6// file "LICENCE" distributed with Cforall.
7//
8// coroutine.c --
9//
10// Author           : Thierry Delisle
11// Created On       : Mon Nov 28 12:27:26 2016
12// Last Modified By : Thierry Delisle
13// Last Modified On : Mon Nov 28 12:27:26 2016
14// Update Count     : 0
15//
16
17#include "coroutine"
18
19extern "C" {
20#include <stddef.h>
21#include <malloc.h>
22#include <errno.h>
23#include <string.h>
24#include <unistd.h>
25#include <sys/mman.h>
26}
27
28#include "kernel"
29#include "libhdr.h"
30
31#define __CFA_INVOKE_PRIVATE__
32#include "invoke.h"
33
34extern volatile thread_local processor * this_processor;
35
36//-----------------------------------------------------------------------------
37// Global state variables
38
39// minimum feasible stack size in bytes
40#define MinStackSize 1000
41static size_t pageSize = 0;                             // architecture pagesize HACK, should go in proper runtime singleton
42
43//-----------------------------------------------------------------------------
44// Coroutine ctors and dtors
45void ?{}(coStack_t* this) {
46        this->size              = 65000;        // size of stack
47        this->storage   = NULL; // pointer to stack
48        this->limit             = NULL; // stack grows towards stack limit
49        this->base              = NULL; // base of stack
50        this->context   = NULL; // address of cfa_context_t
51        this->top               = NULL; // address of top of storage
52        this->userStack = false;
53}
54
55void ?{}(coStack_t* this, size_t size) {
56        this{};
57        this->size = size;
58
59        create_stack(this, this->size);
60}
61
62void ?{}(coroutine_desc* this) {
63        this{ "Anonymous Coroutine" };
64}
65
66void ?{}(coroutine_desc* this, const char * name) {
67        this->name = name;
68        this->errno_ = 0;
69        this->state = Start;
70        this->starter = NULL;
71        this->last = NULL;
72}
73
74void ?{}(coroutine_desc* this, size_t size) {
75        this{};
76        (&this->stack){size};
77}
78
79void ^?{}(coStack_t* this) {
80        if ( ! this->userStack ) {
81                LIB_DEBUG_DO(
82                        if ( mprotect( this->storage, pageSize, PROT_READ | PROT_WRITE ) == -1 ) {
83                                abortf( "(coStack_t *)%p.^?{}() : internal error, mprotect failure, error(%d) %s.", this, errno, strerror( errno ) );
84                        }
85                );
86                free( this->storage );
87        }
88}
89
90void ^?{}(coroutine_desc* this) {}
91
92// Part of the Public API
93// Not inline since only ever called once per coroutine
94forall(dtype T | is_coroutine(T))
95void prime(T* cor) {
96        coroutine_desc* this = get_coroutine(cor);
97        assert(this->state == Start);
98
99        this->state = Primed;
100        resume(cor);
101}
102
103// Wrapper for co
104void CoroutineCtxSwitch(coroutine_desc* src, coroutine_desc* dst) {
105        // THREAD_GETMEM( This )->disableInterrupts();
106
107        // set state of current coroutine to inactive
108        src->state = src->state == Halted ? Halted : Inactive;
109
110        // set new coroutine that task is executing
111        this_coroutine = dst;
112
113        // context switch to specified coroutine
114        assert( src->stack.context );
115        CtxSwitch( src->stack.context, dst->stack.context );
116        // when CtxSwitch returns we are back in the src coroutine
117
118        // set state of new coroutine to active
119        src->state = Active;
120
121        // THREAD_GETMEM( This )->enableInterrupts();
122} //ctxSwitchDirect
123
124void create_stack( coStack_t* this, unsigned int storageSize ) {
125        //TEMP HACK do this on proper kernel startup
126        if(pageSize == 0ul) pageSize = sysconf( _SC_PAGESIZE );
127
128        size_t cxtSize = libCeiling( sizeof(machine_context_t), 8 ); // minimum alignment
129
130        if ( (intptr_t)this->storage == 0 ) {
131                this->userStack = false;
132                this->size = libCeiling( storageSize, 16 );
133                // use malloc/memalign because "new" raises an exception for out-of-memory
134
135                // assume malloc has 8 byte alignment so add 8 to allow rounding up to 16 byte alignment
136                LIB_DEBUG_DO( this->storage = memalign( pageSize, cxtSize + this->size + pageSize ) );
137                LIB_NO_DEBUG_DO( this->storage = malloc( cxtSize + this->size + 8 ) );
138
139                LIB_DEBUG_DO(
140                        if ( mprotect( this->storage, pageSize, PROT_NONE ) == -1 ) {
141                                abortf( "(uMachContext &)%p.createContext() : internal error, mprotect failure, error(%d) %s.", this, (int)errno, strerror( (int)errno ) );
142                        } // if
143                );
144
145                if ( (intptr_t)this->storage == 0 ) {
146                        abortf( "Attempt to allocate %d bytes of storage for coroutine or task execution-state but insufficient memory available.", this->size );
147                } // if
148
149                LIB_DEBUG_DO( this->limit = (char *)this->storage + pageSize );
150                LIB_NO_DEBUG_DO( this->limit = (char *)libCeiling( (unsigned long)this->storage, 16 ) ); // minimum alignment
151
152        } else {
153                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() );
154                this->userStack = true;
155                this->size = storageSize - cxtSize;
156
157                if ( this->size % 16 != 0u ) this->size -= 8;
158
159                this->limit = (char *)libCeiling( (unsigned long)this->storage, 16 ); // minimum alignment
160        } // if
161        assertf( this->size >= MinStackSize, "Stack size %d provides less than minimum of %d bytes for a stack.", this->size, MinStackSize );
162
163        this->base = (char *)this->limit + this->size;
164        this->context = this->base;
165        this->top = (char *)this->context + cxtSize;
166}
167
168// We need to call suspend from invoke.c, so we expose this wrapper that
169// is not inline (We can't inline Cforall in C)
170extern "C" {
171        void __suspend_internal(void) {
172                suspend();
173        }
174}
175
176// Local Variables: //
177// mode: c //
178// tab-width: 4 //
179// End: //
Note: See TracBrowser for help on using the repository browser.