source: src/libcfa/concurrency/coroutines.c @ eb2e723

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 eb2e723 was eb2e723, checked in by Thierry Delisle <tdelisle@…>, 6 years ago

First prototype of kernel with proper startup and shutdown, not yet implemented for i386

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File size: 5.2 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// 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//Current coroutine
39//Will need to be in TLS when multi-threading is added
40coroutine* current_coroutine;
41
42//-----------------------------------------------------------------------------
43// Coroutine ctors and dtors
44void ?{}(coStack_t* this) {
45        this->size              = 10240;        // size of stack
46        this->storage   = NULL; // pointer to stack
47        this->limit             = NULL; // stack grows towards stack limit
48        this->base              = NULL; // base of stack
49        this->context   = NULL; // address of cfa_context_t
50        this->top               = NULL; // address of top of storage
51        this->userStack = false;       
52}
53
54void ?{}(coStack_t* this, size_t size) {
55        this{};
56        this->size = size;
57
58        create_stack(this, this->size);
59}
60
61void ?{}(coroutine* this) {
62        this->name = "Anonymous Coroutine";
63        this->errno_ = 0;
64        this->state = Start;
65      this->notHalted = true;
66        this->starter = NULL;
67        this->last = NULL;
68}
69
70void ?{}(coroutine* this, size_t size) {
71        this{};
72        (&this->stack){size};
73}
74
75void ^?{}(coStack_t* this) {
76        if ( ! this->userStack ) {
77                LIB_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* 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* this = get_coroutine(cor);
93        assert(this->state == Start);
94
95        this->state = Primed;
96        resume(cor);
97}
98
99// We need to call suspend from invoke.c, so we expose this wrapper that
100// is not inline (We can't inline Cforall in C)
101void suspend_no_inline(void) {
102        LIB_DEBUG_PRINTF("Suspending back : to %p from %p\n", this_coroutine(), this_coroutine() ? this_coroutine()->last : (void*)-1);
103
104        suspend();
105}
106
107void corCxtSw(coroutine* src, coroutine* dst) {
108        // THREAD_GETMEM( This )->disableInterrupts();
109
110        // set state of current coroutine to inactive
111        src->state = Inactive;
112
113        // set new coroutine that task is executing
114        current_coroutine = dst;                       
115
116        // context switch to specified coroutine
117        CtxSwitch( src->stack.context, dst->stack.context );
118        // when CtxSwitch returns we are back in the src coroutine             
119
120        // set state of new coroutine to active
121        src->state = Active;
122
123        // THREAD_GETMEM( This )->enableInterrupts();
124} //ctxSwitchDirect
125
126void create_stack( coStack_t* this, unsigned int storageSize ) {
127        //TEMP HACK do this on proper kernel startup
128        if(pageSize == 0ul) pageSize = sysconf( _SC_PAGESIZE );
129
130        size_t cxtSize = libCeiling( sizeof(machine_context_t), 8 ); // minimum alignment
131
132        if ( (intptr_t)this->storage == 0 ) {
133                this->userStack = false;
134                this->size = libCeiling( storageSize, 16 );
135                // use malloc/memalign because "new" raises an exception for out-of-memory
136               
137                // assume malloc has 8 byte alignment so add 8 to allow rounding up to 16 byte alignment
138                LIB_DEBUG_DO( this->storage = memalign( pageSize, cxtSize + this->size + pageSize ) );
139                LIB_NO_DEBUG_DO( this->storage = malloc( cxtSize + this->size + 8 ) );
140
141                LIB_DEBUG_DO(
142                        if ( mprotect( this->storage, pageSize, PROT_NONE ) == -1 ) {
143                                abortf( "(uMachContext &)%p.createContext() : internal error, mprotect failure, error(%d) %s.", this, (int)errno, strerror( (int)errno ) );
144                        } // if
145                );
146
147                if ( (intptr_t)this->storage == 0 ) {
148                        abortf( "Attempt to allocate %d bytes of storage for coroutine or task execution-state but insufficient memory available.", this->size );
149                } // if
150
151                LIB_DEBUG_DO( this->limit = (char *)this->storage + pageSize );
152                LIB_NO_DEBUG_DO( this->limit = (char *)libCeiling( (unsigned long)this->storage, 16 ) ); // minimum alignment
153
154        } else {
155                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() );
156                this->userStack = true;
157                this->size = storageSize - cxtSize;
158
159                if ( this->size % 16 != 0u ) this->size -= 8;
160
161                this->limit = (char *)libCeiling( (unsigned long)this->storage, 16 ); // minimum alignment
162        } // if
163        assertf( this->size >= MinStackSize, "Stack size %d provides less than minimum of %d bytes for a stack.", this->size, MinStackSize );
164
165        this->base = (char *)this->limit + this->size;
166        this->context = this->base;
167        this->top = (char *)this->context + cxtSize;
168}
169
170// Local Variables: //
171// mode: c //
172// tab-width: 4 //
173// End: //
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